09 Combustion SI
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Transcript of 09 Combustion SI
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Combustion in
SI and Diesel Engines
October 13, 2014 I.C. Engines Laboratory Slide 1
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Air motion in cylinder
What causes it?
How do we categorize it?
October 13, 2014 I.C. Engines Laboratory Slide 2
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October 13, 2014 I.C. Engines Laboratory Slide 3
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How does combustion start?
October 13, 2014 I.C. Engines Laboratory Slide 4
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What are the stages o"combustion in an #I engine?
October 13, 2014 I.C. Engines Laboratory Slide 6
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$lame de%elopment
$lame propagation
$lame termination
What happens in each process?
October 13, 2014 I.C. Engines Laboratory Slide
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$lame de%elopment!propagation
October 13, 2014 I.C. Engines Laboratory Slide !
R t SI
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Rate o urn ng n an SIengine
October 13, 2014 I.C. Engines Laboratory Slide "
h " b i i
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&raw the rate o" burning interms o" 'olume burnt %s(
)rank angle Which has a steeper slope?
October 13, 2014 I.C. Engines Laboratory Slide 10
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How long does each phasetake?
Ignition timing?
#tart o" combustion
*resence o" peak pressure )oncept o" +B, timing
October 13, 2014 I.C. Engines Laboratory Slide 11
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October 13, 2014 I.C. Engines Laboratory Slide 12
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$lame #peed
October 13, 2014 I.C. Engines Laboratory Slide 13
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+ain missions
+a.or #pecies
+inor species
October 13, 2014 I.C. Engines Laboratory Slide 14
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+B, ,iming
October 13, 2014 I.C. Engines Laboratory Slide 15
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Abnormal combustion in #Iengines
/nock
# Is constant %olume combustionbene0cial??
*re-ignition
October 13, 2014 I.C. Engines Laboratory Slide 16
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$actors a1ecting knock
October 13, 2014 I.C. Engines Laboratory Slide 1
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$actors a1ecting knock
,emperature
*ressure
,ime )omposition
October 13, 2014 I.C. Engines Laboratory Slide 1!
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$actors a1ecting knock
# )ompression 2atio! supercharging! inletair temperature! coolant temperature!throttle opening! Ignition timing! ngine
geometry# #peed! turbulence! $lame tra%el length
# ui%alence ratio! type o" "uel
3ctane rating4 5!5!6!-,rimethyl pentane 7 n-heptane
+ethyl tert-butyl ether
tert-Amyl methyl ether
October 13, 2014 I.C. Engines Laboratory Slide 1"
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)ombustion
https488www(youtube(com8watch?%9&2#e::t;&u6
October 13, 2014 I.C. Engines Laboratory Slide 20
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)ombustion chamberreuirements
October 13, 2014 I.C. Engines Laboratory Slide 21
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)ombustion chamberreuirements
High pressures near start o" expansion
o deposits
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October 13, 2014 I.C. Engines Laboratory Slide 23
2icardo turbulentcombustion chamber engine
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High turbulence at end o"compression due to piston o1set
#couring o" mixture "rom combustionchamber walls
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October 13, 2014 I.C. Engines Laboratory Slide 25
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Ad%antages o" o%erhead%al%e engines
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y are arge eng nesalmost always diesel
engines?
October 13, 2014 I.C. Engines Laboratory Slide 2
