Benefit of Axial Design Waterjet Propulsion - Wartsila.pdf
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October 05, 2011 Wärtsilä Propulsion Waterjet propulsion solutions
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Water jet
Transcript of Benefit of Axial Design Waterjet Propulsion - Wartsila.pdf
October 05, 2011
Wär
tsilä
Pro
puls
ion
Wat
erje
t pro
puls
ion
solu
tions
October 05, 2011
1661Thomas Toogood and
James Hayes “Forceing water
through the bottomeor sides of shipps
belowe the surface or toppe of the water …
1753Bernoulli investigated
and proved the theory behind
waterjet propulsion
3 December 1787First public trial of a
“waterjet driven vessel”
1839Morris and John
Ruthven “…discharge of water
on the floats of a wheel set in an airtight case…”
1867“Waterwitch” 9.3 knots / = 18%
1883“The Squirt” 12.6 knots / = 25%
1888National lifeboat institution orders
their first jet driven boat. “the advantages
of the absence of a propeller”
1914-1918During the war two
British experimental vessels “for a special service” are equipped
with jets
Early jets - positive displacement pumps
History of Jet Propulsion
October 05, 2011
1976The history of the
Wärtsilä jet division starts with the first
jets delivered for 495 kW
2002Largest waterjets
ever are delivered for 23 MW, designs for
up to 50 MW are available
2004Fastest Wärtsilä
waterjets ever go for trials and reach 70
knots1976 - 2004Waterjets are further developed for larger
powers and efficiency’s up to 74 %
History of Jet Propulsion Part II
2002New developments for axial technology starts eventually slashing transom occupation and exceeding expectations
for cavitation margin improvements
2006Wärtsila introduces the
LJX type waterjets: Axial pump with Mixed flow
properties
1932Riva Calzoni applies it’s first waterjet with
the purpose of testing jet-engines for the aviation industry
1988Riva Calzoni and Lips Jets combine forces: Riva Lips was born
2011Wärtsilä introduces the MIDSIZE “plug and play” waterjets
Why change the impeller design?
FROM MIXED FLOW TO AXIAL PUMPS:
• Market tendency shows that more power is installed in an even narrower transom – less built-in space
• Risk: the biggest possible waterjet size is too small for the installed power and required performance
• Solution: develop a waterjet that can handle larger powers in a smaller size: The Axial built waterjet
Example?October 05, 2011
US Navy: Litteral Combat Ship 2 (LCS2):
October 05, 2011
Mixed Flow pumps: Maximum power for largest possible jet size, no increase of jet size possible!
October 05, 2011
LJ150E (wings) and LJ160E (center), both non
axial waterjets
Biggest possible sizes in LCS2 Transom:• LJ150E, mixed flow, wing jets • LJ160E, mixed flow, center jets
Solutions offered by axial jets (LCS4)
LJ150E (wings) and WLD1720 (center) axial
waterjets
New! Biggest possible sizes in LCS4 Transom:• LJ150E, mixed flow, wing jets • WLD1720, mixed flow, center jets
Solution: Jet size increase of 0,12mwithout increase of built-in space
General Principles
)(.
ij VVQTa m= F
October 05, 2011
Axial Pump design
High Pressure Low Pressure
Low Flow High Flow- P -- Q -
Mixed Flow Impeller Axial Flow ImpellerOctober 05, 2011
October 05, 2011
Benefits of compact & efficient design
10 – 15% lower weight
35% cavitation margin improvement
25% smaller transom mounting flange
Improved hydrodynamic efficiency
8% engine load reduction in maneuvering
10% higher shaft speed reducing torque and thus weight in the drive lines
Tip clearance guaranteed due to axial shape and no risk of impeller housing collisions
October 05, 2011
Axial / non-axial type impeller
Mixed Flow impeller
Axial impeller
October 05, 2011
LJX1620SR – LJ162E weight distribution
Outboard waterjet assembly – 6650 kg
Impeller + shaft – 5650 kg
Outboard waterjet assembly – 9880 kg
Impeller + shaft – 7825 kg
28% Weight Loss
33% Weight Loss
October 05, 2011
LJX1500SR – LJ150E Jetavator difference
Jetavator Mixed Flow LJ150E
Jetavator Axial Flow LJX1500SR
October 05, 2011
LJ71E non axial jet
Option 1: Same transom,Equivalent diameter
axial: WLD720
Option 2: Same transom,larger diameter axial : WLD810
Option 3: Smaller transom,same diameter axial: WLD720
Market tendency for large high powered slender vessels:• Small transom area to reduce resistance• High installed powers
Design problem:• Required jet sizes do not fit into vessel
design• Platforms/slipways are too high above the
waterline
Solutions offered by axial jets
Solutions offered by axial jets
Wärtsilä Midsize Waterjet
Now Wärtsilä has THE solution for waterjet propelled Workboats:
October 05, 2011
Midsize Waterjet
THE WÄRTSILÄ MIDSIZE WATERJET CONCEPT:
“LARGE SIZE QUALITY IN A PRE-ASSEMBLED PLUG-AND-PLAY PACKAGE”
October 05, 2011
Midsize Waterjet features
One Plug and Play concept:– Unit fully pre-assembled – Including inlet duct– Pre-aligned by Wärtsilä– Delivered to shipyard for instant hull “weld-in”– No transom machining required– Mechanical interfaces minimized to drive shaft connection and one cooling
water connection.• No commissioning required• Stainless Steel Stator bowl for lifetime performance• Improved steering and reversing performance
October 05, 2011
Ship owner benefits
• High performance pump design with hull optimized inlet duct for superior performance at ship speeds up to 50 knots
• Inboard hydraulics and feedback:– Reduced maintenance– Easy access
• No external oil lubricated or oil containing parts outside the hull ensuring a 100% spill free system
• Hydraulic power pack and thrust bearing lubrication set for less maintenance & higher reliability
• Guaranteed lifetime performance because of Stainless Steel stator bowl
October 05, 2011
Shipyard benefits
• Reduced lead time for design information and equipment • Reduced cost price• Number of delivered parts strongly reduced; only 1 pre-assembled and factory
tested Waterjet unit • Installation work reduced, reducing vessel delivery time and reducing
installation risk (simplified installation)• No commissioning required
October 05, 2011
Click to play animation
October 05, 2011
Midsize jet Parts
Cylinders and thrust bearing inboard resulting in full absence of oil lubricated or oil containing parts outboard of the vessel
Hull customised inlet duct in for top performance and shipyard risk reduction Unique compact high
performance steering & reversing assembly
All piping connected, just one cooling water
connection to be made by the shipyard
Weld-in skid manufactured in the same material as the
hull
SRF-series Easy installation, High Efficiency, Low Maintenance
Machinery controls cabinet with high level of control intelligence mounted on
skid
THANK YOU!
Joeri PoelmannBusiness Manager
Wärtsilä Ship Power
Specials Segment+31 6 57937485
More information [email protected]
October 05, 201120 ©
