BI 2: BM LY TM1. Mc ch th nghim.Xc nh ct p ton phn ca bm, cng sut v hiu sut cho bm ly tm bng vic o c cc thng s khi thay i cc lu lng bm.Kho st v xy dng cc ng c tuyn ca bm.S dng nh lut t l tin on cc thng s c trng ca bm: tnh ton gi tr mong mun cho mt tc bm th 2 theo s liu o c tng ng vi tc bm kho st so snh vi kt qu th nghim.Kho st s nh hng ca vic thay i ct p ng ht i vi bm, ng thi kho st hin tng xm thc bng cch thay i p sut trong ng ht vi vic thay i van ht thay i lu lng.Xy dng ng c tuyn ca mng ng xc nh im lm vic ca bm.1. C s l thuyt.1. Cc thng s c trng ca bm.Cc thng s c trng hot ng ca bm ly tm c m t hoc minh ha bng s dng cc th tuyn tnh ca bm. Ba ng biu din c tuyn ca bm c s dng nhiu nht:S thay i ct p ton phn to ra do bm vi lu lng.Cng sut cp cho bm vi lu lng.Hiu sut ca bm vi lu lng.0. Ct p ton phn.S thay i ct p ton phn do bm to ra l kt qu ca cng c thc hin bi bm, c tnh : Ht = Chnh lch ct p tnh + chnh lch ct p ng + Chnh lch chiu cao hnh hc.Ht = Hs + Hv + HeChnh lch ct p tnh:Hs =Trong :Pin l p sut cht lng ti u vo, Pa.Pout l p sut cht lng ti u ra, Pa.Chnh lch ct p ng:H = Trong : vin l vn tc ti u vo, m/s.vout l vn tc ti u ra, m/s.Chnh lch chiu cao hnh hc:He = Zout - Zin.Trong :Zout l chiu cao hnh hc ti u ra, m.Zin l chiu cao hnh hc ti u vo, m.0. Cng sut cung cp.Cng sut ng c cung cp i vi bm c th c tnh ton:Pm = Trong :n l tc vng quay ca bm, vng/pht.t l mooment xon ca trc, Nm.0. Hiu sut ca bm.Hiu sut ca bm c tnh:E = Trong :Ph l cng sut thy lc tc ng ti cht lng, c tnh:Ph = HtTrong :Q l lu lng th tch, m3/s.1. ng c tuyn bm.1. ng c tun mt tc khng i.Mi thng s trong cc thng s c trng ca bm c o tc bm khng i v c biu din so vi lu lng th tch Q, chuyn ng bm.1. ng c tuyn tng hp.Mt cch biu din cc thng s c trng ca bm l xy dng cc ng bao ca cng sut hoc hiu sut khng i trn mt th ca ct bm vi lu lng bm. Nhng ng ny cho php cc k s hiu hiu sut ti a ca mt bm trn trn mt di ca cc thng s hot ng, m c th h tr trn vic la chn mt bm thch hp i vi cc iu kin cho.1. nh lut t l.Khi la chn bm cho h thng, him khi tin hnh th nghim kim tra cc c trng ca mi loi bm trong cc bm do nh xn xut cung cp tt c cc tc m n c thit k. Do ngi ta a ra mt gii php ton hc m cho php cc gi nh c th c a cho cc c trng hot ng ca bm vn hnh mt tc , kch thc bnh gung, t cc kt qu thc nghim vi nhau.Nhiu ng cong thu c t vic v cc thng s c trng ca bm o c trn cc trc ta c th rt gn thnh mt ng n nu c nhm v th nguyn xp x c s dng. Nh bit th cc nh hng ca nht cht lng ln c tnh ca bm l nh, v hin tng xm thc khn xut hin, c tnh ca mt loi bm c biu din:

Trong :N l tc bm( rpm hoc Hz) v D l ng knh cnh gung(m).Tt c vn tc lu cht cc im tng ng vi my l cng hng v t l vi tc gung quay. Khi nh th, i vi mt bm xc nh hot ng cc tc khc nhau.nh lut t l cho php c trng ca cc bm cng thng s hnh hc ca cc loi hay tc khc nhau tin on v chnh xc i vi cc mc ch th nhim.Cc nh lut ny thng c s dng tnh s thay i lu lng, ct p v cng sut ca mt bm kh loi, tc quay hoc khi lng ring ca lu cht thay i. Biu thc sau c rt t cc yu cu trn, cho php tnh ct p tng, cng sut mt tc n1 c thay i n mt tc khc n2.

1. nh hng ca ct p u vo.Trong c thit k v hot ng ca my ng lc, lu cn thn phi dnh cho cc iu kin lu cht trong ng ht. Trong trng hp ring, tht l quan trng kim tra p sut thp nht m c th xy ra bt k im no chc chn rng hin tng xm thc khng xy ra.3. Hin tng xm thc.Nu p sut ti thi im bt k no thp hn p sut bay hi ca cht lng nhit ti im , s ha hi s xut hin. iu ny thng xy ra nht ng ht, ni m p sut thp nht c nghin cu. cht lng c ha hi xut hin cc bong bng vi cht lng, v iu ny sau b ph v vi lc c hc m c th chu c. iu kin ny c bit n l hin tng xm thc, c km theo bi mt s tng ting n c trng vi s rung ng lm cho gim ct p.Thm vo , tim n mi nguy hi vt l i vi bm t hin tng xm thc, c t kt qu ca rung ng v t n ca s v bong bng hi, cc bm khng th bm 1 cch hiu qu. Do , nu hin tng xm thc xy ra th bm c th khng kh nng to ct p ht cn thit.3. Chiu cao ht thc cn thit.Cc nh sn xut thng cung cp mt chiu cao ht thc( NPSH) da vo kt qu kim tra. Vic kim tra thng xuyn xc nh NPSH lin quan n vic vn hnh bm bm nc cc lu lng khc nhau, trong khi vic iu tit trong ng ht. p sut ht ti im u tin xut hin s ha hi c ghi ch i vi mi lu lng. NPSH l i lng cho p sut ht ti im bt u hin tng xm thc.Gi tr NPSHa ph thuc vo h thng c th ca bm s dng v c tnh ton theo iu kin h thng. i vi h thng bm n gin dng d bm nc, c tnh nh sau:NPSHa = Hatmos ( Hvapour Hin +Hv )Trong :Hatmos p sut kh quyn biu din theo ct p, mmH2O.Hvapour p sut bc hi ca nc nhit o trong bi thi nghim, mmH2O.Hin p sut o c trn ng ht bng cm bin sut, mmH2O.Hv ct p ng trn ng ht, mmH2O.1. c trng ca h thng.4. Tng qut.Phn tch h thng i vi vic lp t bm c s dng la chn cc iu kin hot ng n nh ca bm v xc nh cc im lm vic ca chng. Phn tch h thng lin quan n vic xy dng ng cong ct p lu lng cho h thng v vic s dng ng cong ny cng vi cc ng c tuyn ca bm sn c la chn bm thch hp nht s dng vi h thng.ng cong h thng l mt ng biu din lu lng trong h thng ct p ca h thng. N cho bit mi quan h gia lu lng v h thng thy lc trong h thng. cc tn tht th ph thuc vo thit k h thng v cc iu kin hot ng.Gi nh rng:Tc dng t l vi lu lng th tch.Cc tn tht trong h thng l t l bc hai vi tc dng.4. D on c tnh ca h thng.Phng php n gin nht ca vic tnh ton l s dng phng trnh Hazen Wiliam cho tn tht chnh. Phng trnh ny s dng mt h s ph thuc vo vt liu lm ng, vi cc gi tr chiu di, ng knh v lu lng trong h thng. Phng trnh ny khng phi l phng trnh chnh xc nht m n ch s dng cho nc chy nhit thng nhng n l cho nhiu mc ch th nghim. chnh xc c th tng ln bng cch thm vo 1 phng trnh bc 2 cho tnh ton cc tr lc cc b domcacs ni ng.Tn tht tng trong h thng:H = hf + hmVi tn tht chnh trn ng l:hf = L[Tn tht khc trong ng:hm = kTrong :L tng chiu di ng(m).d ng knh ng( m).V vn tc dng(m/s).g gia tc trng trng(m/s2).C h s ph thuc vo vt liu lm ng, ng acrylic: C = 140.k h s tr lc cc b.k = 0.5 u vo ca ng.k = 1 u ra ca ng.k = 0.3 co 90ok = 0.4 co 45ok = 0 van bi khi m hon tonk = 2.1 van cng khi m 1 nak = 1 lu lng k.

1. Tin hnh th nghim1. Th nghim 1: Xc nh cc thng s c trng ca bm1. Bt cng tc IFD71. Bt cng tc bm FM501. Ci t tc ch 70%. Phn mn s tng tc bm n gi tr ci t1. Cho bm chy tun hon cho n khi ui kh ra h thng. ng v m nh nhng van ht v van y mt vi ln kh mt s bt kh trong h thng. Sau , m hon ton van ht.1. Trong bng kt qu, i tn sheet thnh70%1. ng van y hon ton lu lng bng 01. Nhp chut vo biu tng GO ghi li gi tr o c v bng s liu ca phn mn1. M van y mt t tng lu lng ln mt t, i mt lc cho bm hot ng n nh ri nhp chut vo biu tng GO ghi li gi tr o c vo bng s liu ca phn mn1. Tng dn m van v ghi nhn gi tr o vo bng s liu ca phn mn cho n khi van m hon ton (t nht 10 gi tr).1. Th nghim 2:Xy dng cc ng c tuyn tng hp1. Ci t tc ch 50%. 1. Cho bm chy tun hon cho n khi ui kh ra h thng. ng v m nh nhng van ht v van y mt vi ln kh mt s bt kh trong h thng. Sau , m hon ton van ht.1. Trong bng kt qu, i tn sheet thnh 50%1. ng van y hon ton lu lng bng 01. Nhp chut vo biu tng GO ghi li gi tr o c v bng s liu ca phn mn1. M van y mt t tng lu lng ln mt t, i mt lc cho bm hot ng n nh ri nhp chut vo biu tng GO ghi li gi tr o c vo bng s liu ca phn mn1. Tng dn m van v ghi nhn gi tr o vo bng s liu ca phn mn cho n khi van m hon ton (t nht 10 gi tr).1. M mt sheet mi trn mn hnh v i tn thnh 60%1. Ci c tc bm l 60% v tin hnh th nghim nh trn1. Ci c tc bm l 80% v tin hnh th nghim nh trn1. Ci c tc bm l 90% v tin hnh th nghim nh trn1. Ci c tc bm l 100% v tin hnh th nghim nh trn1. Th nghim: nh lut t l1. Ci t tc ch 50%. 1. Cho bm chy tun hon cho n khi ui kh ra h thng. ng v m nh nhng van ht v van y mt vi ln kh mt s bt kh trong h thng. Sau , m hon ton van ht.1. Trong bng kt qu, i tn sheet thnh 50%1. ng van y hon ton lu lng bng 01. Nhp chut vo biu tng GO ghi li gi tr o c v bng s liu ca phn mn1. M van y mt t tng lu lng ln mt t, i mt lc cho bm hot ng n nh ri nhp chut vo biu tng GO ghi li gi tr o c vo bng s liu ca phn mn1. Tng dn m van v ghi nhn gi tr o vo bng s liu ca phn mn cho n khi van m hon ton (t nht 10 gi tr).1. M mt sheet mi trn mn hnh v i tn thnh 60%1. Ci c tc bm l 60% v tin hnh th nghim nh trn1. Ci c tc bm l 70% v tin hnh th nghim nh trn1. Ci c tc bm l 80% v tin hnh th nghim nh trn1. Ci c tc bm l 90% v tin hnh th nghim nh trn1. Ci c tc bm l 100% v tin hnh th nghim nh trn1. Th nghim 4: nh hng ca ct p ht (Hin tng xm thc)Ci t tc ch 70%. 1. Cho bm chy tun hon cho n khi ui kh ra h thng1. Ci t tc ch 20% v i tn sheet thnh 20%1. ng van ht mt cht lm gim lu lng o c1. Nhp chut vo biu tng GO ghi li gi tr o c v bng s liu ca phn mn1. ng van ht mt t gim lng lu ln mt t, i mt lc cho bm hot ng n nh ri nhp chut vo biu tng GO ghi li cc gi tr o c vo bng s liu ca phn mn.1. Gim dn m van v ghi nhn li cc gi tr o vo bng s liu ca phn mn cho n khi van ng hon ton (t nht 10 gi tr)1. M van ht hon ton1. To mt sheet mi vi tn l 60%1. Lp li th nghim nh tc bm 20%1. To mt sheet mi vi tn l 100%1. Lp li th nghim nh tc bm 20%1. Bt kh s c quan st quanh bnh gung trong sut th nghim. Tuy nhin, hin tng xm thc cng c th khng xy ra trong iu kin lm vic ca h thng ny. Nu n c din ra, c th pht hin d dng bng vic gim hoc s bin ng ca p sut v ting n c bit (nh m thanh ca giy bng knh xenlofan ku tanh tch, v m thanh nh trong bm y hoc cm thch). Nu hin tng xm thc bt u xut hin hay ghi ch li. Ngay sau khi c kt qu hy m dn van ht khng cn hin tng xm thc na trnh tc hi n cnh gung.1. Nu hin tng xm thc khng xut hin th c th l do nhiu nguyn nhn nh: nhit cht lng cao, lu lng ln (tc cnh gung qu nhanh), p sut mi trng thp ct p ht thp.1. Nu hin tng xm thc tht s c ghi ch li trong sut qu trnh th nghim, th chng ta phi tho cnh gung ra v kim tra nhng thit hi trn .1. Th nghim 5: Xy dng ng c tuyn ca h thng v xc nh im lm vic1. o chiu di ng ng ca h thng, khng bao gm phn i qua bm.1. Cng tt c cc gi tr h s tr lc cc b trong h thng: ni b cha vi ng, ni ng vi b cha, cc co, van v lu lng k (khng bao gm phn ni vi bm).1. Bt cng tc IFD7.1. Bt cng tc bm FM50.1. Ci t tc bm ch 100%.1. Cho bm chy tun hon cho n khi ui kh ra h thng.1. Nhp chut vo biu tng GO ghi li gi tr o c vo bng s liu ca phn mm1. Ci c tc bm l 90% v nhp chut vo biu tng GO ghi li gi tr o c vo bng s liu ca phn mm.1. Lp li vic mi ln gim i tc 10% cho ti khi tc t 0%.1. To sheet mi vi tn l 70%.1. Nhp chut vo biu tng GO ghi li gi tr o c vo bng s liu ca phn mm.1. ng van y m bo lu lng gim i mt t. i 1 lc cho h thng n nh v nhp chut vo biu tng GO ghi li gi tr o c vo bng s liu ca phn mm.1. Gim dn m van ca van y m bo lu lng gim dn dn. Tng ng vi mi ln ghi li kt qu vo bng s liu cho n khi van ng hon ton. t nht 10 gi tr.

1. Kt qu th nghim v x l s liu3. Kt qu th nghimTh nghim 1STTCh S (%)n (rpm)T (oC)Pin (kPa)Pout (kPa)t (Nm)Q (l/s) (kg/m3)Hvapour (kPa)

170105033.72.735.60.440.29955.23

233.92.634.70.470.289945.29

333.92.534.40.460.329945.29

433.82.232.90.480.439955.26

533.91.731.60.510.499945.29

633.81.4300.520.569955.26

7340.928.30.540.619945.3

833.60.527.10.550.699955.22

933.80.126.20.560.729955.26

1033.8-0.125.50.570.739955.24

Th nghim 2STTch S (%)n (rpm)T (oC)Pin (kPa)Pout (kPa)t (Nm)Q (l/s)p (kg/m3)Hvapour (kPa)

15075034.42.917.50.570.099945.44

234.22.917.30.580.155.38

334.12.917.30.580.165.33

4342.817.30.580.135.32

534.22.817.10.60.175.38

634.12.8170.610.195.35

734.12.817.10.620.215.33

834.42.817.10.620.235.44

934.32.716.60.620.255.41

1034.12.616.60.620.275.36

116090034.92.9250.610.019945.6

1234.92.623.80.640.295.58

1334.92.222.40.670.375.58

1434.91.720.80.690.465.6

15351.318.90.710.575.63

1634.90.315.30.740.685.6

1734.9-0.312.90.750.745.58

1835.1-0.611.50.750.785.64

1935.1-1100.760.825.63

2035-1.38.50.770.865.58

2180120033.92.7440.660.089945.29

2233.82.3420.670.289955.24

2333.82.141.70.70.369955.24

2433.81.739.40.740.469955.24

2533.81.237.40.760.569955.26

2633.90.334.40.760.669945.27

2733.9-0.232.60.770.769945.24

2833.8-0.630.90.790.89955.24

2934-129.40.820.849955.32

3033.8-1.825.70.850.939945.32

3190135033.92.351.70.640.39945.29

3233.91.8500.70.465.29

3334147.10.730.585.3

3433.90.645.20.740.665.27

3533.90.343.70.760.735.27

3633.9-0.342.70.760.765.29

3734.1-139.50.780.845.33

3833.9-1.338.20.790.885.27

3933.9-1.935.40.810.925.29

4034-2.633.10.8215.32

41100150034.12.563.80.680.219945.49

4234.12.361.90.710.365.33

4334.2261.30.710.435.35

4434.11.759.10.740.485.38

4534.11.157.20.770.65.35

4634.10.5550.790.695.33

4734.1-0.352.50.810.735.36

4834.2-1.149.50.830.855.38

4934.1-1.646.70.860.925.35

5034-2.344.90.870.965.35

Th nghim 3Sttch S (%)n (rpm)T (oC)Pin (kPa)Pout (kPa)t (Nm)Q (l/s)p (kg/m3)Hvapour (kPa)

15075035.12.916.50.60.129945.64

235.12.815.80.60.25.66

334.92.414.80.620.35.58

434.92.414.80.620.355.55

534.72.113.90.640.415.53

634.81.812.60.660.465.55

734.81.311.10.660.535.56

8351.19.70.680.65.63

934.90.88.40.660.645.58

1034.60.57.20.680.685.63

116090035.52.924.80.640.079945.79

1235.42.723.60.650.245.74

1335.62.522.60.660.295.72

1435.62.321.90.680.385.8

1535.61.920.80.680.445.82

1635.51.619.80.710.495.85

1735.51.2180.720.565.8

1835.61170.730.615.77

1935.60.514.90.740.695.79

2035.5-0.212.40.750.745.76

2170105034.8333.80.630.019945.5

2234.82.732.60.640.155.56

23352.832.70.680.235.63

2435.12.531.60.680.285.64

2534.92.130.40.710.365.61

2634.71.929.30.70.465.6

2735.11.528.30.740.55.53

2834.91.2270.750.575.55

2934.61.126.10.760.65.64

3034.60.624.40.780.655.58

3180120034.4-320.50.791.019945.44

3234.4-3.119.90.781.025.44

3334.3-3.319.10.791.045.41

3434.3-3.418.70.81.085.4

3534.8-3.617.40.851.095.56

3634.6-415.80.861.15.52

3734.5-4.414.30.841.135.47

3834.4-4.613.40.821.165.43

3934.7-4.712.80.861.175.53

4034.4-4.911.80.91.185.49

4190135034.72.349.20.650.359945.53

4234.71.747.50.670.55.53

4334.60.744.10.720.655.5

4434.6-0.141.50.740.745.49

4534.7-136.90.760.865.53

4634.6-2.631.80.830.975.52

4734.6-3.428.60.821.065.49

4834.7-3.725.80.861.15.53

4934.6-521.40.851.175.52

5034.7-5.718.60.91.255.5

51100150034.8-1.446.10.830.899945.55

5234.9-243.70.860.935.6

5334.9-2.940.40.891.045.58

5434.8-4.135.20.91.135.56

5534.9-5.130.80.941.185.58

5634.8-5.728.30.971.235.56

5734.7-6.824.20.971.315.53

5834.9-7.620.31.011.365.6

5934.8-7.818.811.385.58

6034.9-8.217.81.011.395.6

Th nghim 4Sttch S (%)n (rpm)T (oC)Pin (kPa)Pout (kPa)t (Nm)Q (l/s)p (kg/m3)Hvapour (kPa)

12030035.32.400.530.329945.71

235.22.20.550.35.69

335.320.550.295.72

435.11.90.560.285.68

535.21.60.560.275.69

635.21.10.580.245.69

735.20.90.580.235.71

835.30.80.590.215.68

935.30.40.60.195.6

1035.10.20.60.165.66

116090036.2-9.21.80.720.859946.02

1236.2-9.21.80.720.765.98

1336.2-12.30.80.760.725.93

1436.1-15.50.10.730.665.9

1536.1-16.70.10.720.586.02

1636.2-17.700.730.566.02

1736.2-18.40.720.536.05

1836.4-190.720.496.07

1936.1-19.80.710.485.98

2036.1-20.60.710.446.03

21100150035.1-9.5121.061.479945.68

2235.2-27.67.80.961.265.69

2335.3-375.30.951.125.71

2435.2-42.33.80.911.025.69

2535.3-48.11.90.840.95.71

2635.3-51.50.70.850.815.69

2735.2-54.70.20.810.725.72

2835.3-570.20.770.635.71

2935.3-58.200.780.565.59

3035.3-62.300.680.385.66

Th nghim 5Sttch S (%)n (rpm)T (oC)Pin (kPa)Pout (kPa)t (Nm)Q (l/s)p (kg/m3)

1100150035.9-9.411.11.021.46994

290135036-7.78.60.871.37

380120036-5.86.80.821.25

470105036-44.10.771.09

56090037-2.120.660.94

65075036.5-0.60.10.550.78

74060037.4-103.200.490.63

83045036.3-103.30.440.48

92030036.3-103.30.530.32

101015036.1-103.30.850.17

110035.1-103.30.020

3. X l s liuTh nghim 1STTQ (m3/s)Ht (m)Hs (m)Hv (m)He (m)Pm (W)Ph (W)E (%)

10.00023.4833.3710.0390.07448.3816.80014.055

20.000283.4423.2920.0760.07451.6799.39718.183

30.000323.4443.2710.0990.07450.58010.74721.249

40.000433.3983.1450.1790.07452.77914.26127.020

50.000493.3723.0660.2320.07456.07716.11228.732

60.000563.3072.9300.3030.07457.17718.07631.613

70.000613.2432.8100.3590.07459.37619.29132.490

80.000693.2592.7250.4600.07460.47621.94836.293

90.000723.2482.6740.5010.07461.57522.83037.076

100.000733.2112.6230.5150.07462.67522.88236.508

Th nghim 2Sttch S (%)Q (m3/s)Ht (m)Hs (m)Hv (m)He (m)Pm (W)Ph (W)E (%)

1500.000091.5791.4970.0080.07444.7681.3863.096

20.000151.5721.4770.0220.07445.5532.3005.049

30.000161.5751.4770.0250.07445.5532.4585.396

40.000131.5771.4870.0160.07445.5531.9994.389

50.000171.5681.4660.0280.07447.1242.6005.517

60.000191.5651.4560.0350.07447.9092.9006.052

70.000211.5831.4660.0430.07448.6953.2426.657

80.000231.5921.4660.0510.07448.6953.5707.330

90.000251.5601.4250.0600.07448.6953.8037.809

100.000271.5801.4360.0700.07448.6954.1608.543

11600.000012.3402.2660.0000.07457.4910.2280.397

120.000292.3292.1740.0810.07460.3196.58710.920

130.000372.2782.0720.1320.07463.1468.21813.014

140.000462.2371.9590.2040.07465.03110.03415.430

150.000572.1931.8050.3140.07466.91612.18718.212

160.000682.0591.5380.4460.07469.74313.65119.573

170.000741.9561.3540.5290.07470.68614.11719.972

180.000781.9021.2410.5870.07470.68614.46920.469

190.000821.8511.1280.6490.07471.62814.80320.666

200.000861.7931.0050.7140.07472.57115.03720.720

21800.000084.3164.2350.0060.07482.9383.3674.059

220.000284.2174.0670.0760.07484.19511.52513.689

230.000364.2564.0570.1250.07487.96514.95617.002

240.000464.1413.8620.2040.07492.99118.59219.993

250.000564.0853.7090.3030.07495.50422.33223.383

260.000663.9923.4970.4210.07495.50425.68926.898

270.000763.9953.3640.5580.07496.76129.60930.600

280.000803.9193.2270.6180.07499.27430.60330.827

290.000843.8703.1140.6810.074103.04431.72930.791

300.000933.7292.8200.8350.074106.81433.81931.662

31900.000305.2275.0660.0870.07490.47815.29116.900

320.000465.2214.9430.2040.07498.96023.42023.666

330.000585.1264.7280.3250.074103.20128.99328.094

340.000665.0684.5740.4210.074104.61532.61931.180

350.000735.0394.4510.5150.074107.44235.87133.387

360.000765.0414.4100.5580.074107.44237.36134.773

370.000844.9094.1530.6810.074110.27040.20636.462

380.000884.8734.0510.7480.074111.68441.81137.437

390.000924.7163.8250.8170.074114.51142.31136.949

400.001004.7013.6610.9660.074115.92545.83739.540

411000.000216.4036.2860.0430.074106.81413.11212.275

420.000366.3116.1120.1250.074111.52722.15519.865

430.000436.3346.0810.1790.074111.52726.55823.813

440.000486.1835.8860.2220.074116.23928.94024.897

450.000606.1755.7530.3480.074120.95136.12729.869

460.000696.1235.5890.4600.074124.09341.19633.198

470.000736.0035.4150.5150.074127.23542.73333.586

480.000855.9615.1890.6980.074130.37649.40537.894

490.000925.8444.9530.8170.074135.08852.43138.812

500.000965.8044.8400.8900.074136.65954.33439.759

Th nghim 3Sttch S (%)Q (m3/s)Ht (m)Hs (m)Hv (m)He (m)Pm (W)Ph (W)E (%)

1500.000121.4831.3950.0140.07447.1241.7353.681

20.00021.4461.3330.0390.07447.1242.8205.983

30.00031.4331.2720.0870.07448.6954.1918.606

40.000351.4641.2720.1180.07448.6954.99610.260

50.000411.4461.2100.1620.07450.2655.78311.504

60.000461.3861.1080.2040.07451.8366.21611.992

70.000531.3501.0050.2710.07451.8366.97813.462

80.00061.3040.8820.3480.07453.4077.62714.280

90.000641.2490.7790.3950.07451.8367.79415.036

100.000681.2080.6870.4460.07453.4078.00714.992

11700.000013.2333.1590.0000.07469.2720.3150.455

120.000153.1623.0660.0220.07470.3724.6256.572

130.000233.1913.0660.0510.07474.7707.1589.573

140.000283.1342.9840.0760.07474.7708.55711.444

150.000363.1012.9020.1250.07478.06910.88713.945

160.000463.0882.8100.2040.07476.96913.85217.997

170.00053.0642.7480.2410.07481.36714.93818.358

180.000573.0342.6460.3140.07482.46716.86120.446

190.00062.9852.5640.3480.07483.56617.46720.901

200.000652.9232.4410.4080.07485.76518.52521.599

21800.001013.4692.4100.9850.07499.27434.16434.414

220.001023.4372.3591.0050.07498.01834.18734.879

230.001043.4152.2971.0440.07499.27434.63734.890

240.001083.4672.2661.1260.074100.53136.50736.315

250.001093.3752.1541.1470.074106.81435.86933.581

260.00113.2732.0311.1680.074108.07135.10532.483

270.001133.2251.9181.2330.074105.55835.53133.660

280.001163.2191.8461.2990.074103.04436.41335.337

290.001173.1901.7951.3220.074108.07136.39833.680

300.001183.1311.7131.3440.074113.09736.02731.854

S liu d on:STTch S (%)n (rpm)Q (m3/s)Ht (m)Pm (W)

1507507.14286E-061.64933825.24494

20.0001071431.61328225.64565

30.0001642861.62825727.24851

40.00021.59896127.24851

50.0002571431.58232528.45065

60.0003285711.57562928.04993

70.0003571431.56315229.65279

80.0004071431.54772630.0535

90.0004285711.52315930.45421

100.0004642861.4911631.25564

118012001.14286E-054.222304103.4033

120.0001714294.130001105.0446

130.0002628574.168339111.6099

140.000324.09334111.6099

150.0004114294.050751116.5339

160.0005257144.03361114.8925

170.0005714294.001668121.4578

180.0006514293.962178123.0991

190.0006857143.899286124.7405

200.0007428573.817369128.0231

Th nghim 4Sttch S (%)Q (m3/s)Ht (m)Pm (W)Ph (W)E (%)Hin (mmH2O)Hvapour (mmH2O)NPSH

1200.00032-0.07316.650-0.229-1.373244.648582.0599563.720

20.0003-0.06517.279-0.189-1.096224.261580.0209557.344

30.00029-0.05017.279-0.141-0.817203.874583.0789539.595

40.00028-0.04517.593-0.123-0.701193.680579.0019538.982

50.00027-0.02017.593-0.052-0.295163.099580.0209512.692

60.000240.01718.2210.0390.216112.130580.0209476.496

70.000230.03318.2210.0740.40391.743582.0599458.608

80.000210.03518.5350.0710.38281.549579.0019459.969

90.000190.06818.8500.1260.66740.775570.8469435.073

100.000160.07818.8500.1220.64720.387576.9629418.708

11600.000851.90067.85815.74523.203-937.819613.6607750.932

120.000761.76067.85813.04119.218-937.819609.5827894.914

130.000721.91871.62813.46618.799-1253.823604.4857641.165

140.000662.09468.80113.47919.591-1580.020601.4277397.971

150.000582.12267.85811.99917.683-1702.345613.6607359.194

160.000562.19268.80111.97017.397-1804.281613.6607279.271

170.000532.23267.85811.53617.000-1875.637616.7187236.430

180.000492.25467.85810.77115.873-1936.799618.7567212.623

190.000482.32766.91610.89216.277-2018.349609.5827149.613

200.000442.37366.91610.18315.218-2099.898614.6797098.498

211000.001474.365166.50462.57337.580-968.400579.0016366.202

220.001265.237150.79664.34742.671-2813.456580.0205073.661

230.001125.623149.22661.41141.153-3771.662582.0594435.128

240.001025.806142.94257.74940.400-4311.927580.0204103.524

250.00095.984131.94752.51339.799-4903.160582.0593732.708

260.000816.061133.51847.87035.853-5249.745580.0203536.755

270.000726.205127.23543.56234.237-5575.943583.0783340.452

280.000636.323120.95138.84532.116-5810.398582.0593224.328

290.000566.345122.52234.65028.280-5932.722569.8273194.664

300.000386.602106.81424.46522.904-6350.663576.9622932.954

Nhn xt:Chiu cao ct p cng gim th hiu sut cng tng

Ct p ton phn

Ta c = = = 3,37 (m) = = 0,9947 (m)dout = 16mm = 0,016 (m) din = 23mm = 0,023 (m) = = 0,48 (m/s) = = = 0,0387 (m/s) = 7,4 (cm) = 0,074 (m) = 3.37 + 0,0387 + 0,074 = 3,4827 (m) Cng sut, hiu sut bm

3.2. Th nghim 2

Nhn xt Chiu cao ct p tngdn tng ng vi cc ch tng dn ch 50%, chnh lch v lu lng l nh nht ch 100%, chnh lch v lu lng l ln nhtTnh ton Ct p ton phn

Cng sut, hiu sut

3.3. Th nghim 3:Bng s liu:

X l s liu:

S liu d on:

+ Ch 50%

+ D on (ch 70% 50%)

+ D on (ch 70% -> 80%)

Ch 80%:

3.4. Th nghim 4:Bng s liu:

X l s liu:

3.5. Th nghim 5:D liu th 2 = = = 1.6716(m) = = 6.8138 (m/s)dout = 16mm = 0,016 (m) din = 23mm = 0,023 (m) = = 3,2974 (m/s) = = = 1.8122 (m/s) = 7,4 (cm) = 0,074 (m) = 1.6716+ 1.8122 + 0,074 = 3.5578(m) Cng sut, hiu sut bm

D liu th nhtc tuyn mng ng

= = 3.514 (m/s) = = 7.261 (m/s)

= = = 2.0246 (m) = = = 2.1023(m)

= 7,4 (cm) = 0,074 (m) = 2.0246 + 2.1023+ 0,074 = 4.2009(m)

Thng qua cc s liu thu c t th nghim thc t, ta thy c mt s sai s i vi cc thng s khi tnh trn cng thc l thuyt. mi ch khc nhau s c nhng thnh phn khc nhau nhng bn cnh cng c trng hp trng lp.Nguyn nhn dn n s sai s c th l do cc nguyn nhn sau: Do thit b lm th nghim Do ngi tin hnh th nghim Cc iu kin khch quan ca mi trng xung quanh nh l : nhit , m ca phng th nghim.Ngoi ra th vic tnh ton lu lng bng th cng v lu lng xc nh c trn my cng c mt s sai s khng nh.Ti liu tham kho[1]. Cc qu trnh v thit b c hc, trng DHCN TP.HCM, khoa my - thit b ha hc, 2011, p110-129.[2]. Gio trnh hng dn thc hnh K thut thc phm, trng DHCN TP.HCM, khoa cng ngh ha, b mn my thit b, 2015.http://123doc.org/document/2417541-bao-cao-khi-nen-bom-ly-tam.htm?page=4http://thuylucducanh.vn/tin-tuc/Tin-chuyen-nganh/Uu-nhuoc-diem-va-ung-dung-cua-bom-li-tam-thuy-luc-3358.aspx