Paper On Water jet Propulsion Discussed During SNAME Philadelphia Section Meeting
The subject of the January meeting of the Philadelphia Section of The Society of Naval Architects and Marine Engineers was "Waterjet Propulsion." Considering the U.S. Navy's latest philosophy of smaller, faster, ships, the paper was very timely.
Lt. Comdr. Dennis F. Kruse, USN, presented his paper titled "Waterjet Propulsion, An Optimization Procedure." The paper is a description of the development of computer programs for optimization and performance evaluation of certain waterjet propulsion design parameters. Work was performed as a graduate student research project at M.I.T. and was sponsored by the U.S. Navy for purposes of furthering its hydrofoil boat program. The presentation included the basic dynamics of waterjet propulsion and the rationale involved in the optimization process and performance evaluation.
An existing computerized method for optimum design of waterjet propulsion systems for sub-cavitating hydrofoil craft is analyzed for sensitivity to variations in normally fixed parameters and for sensitivity to variations in the starting points for the search used in the optimization procedure. A compatible method for off design evaluation of waterjet propulsion systems is developed and incorporated into the optimization program in a manner which permits off design evaluation to be performed separately or in conjunction with design. The evaluation routine requires that system geometry, craft characteristics and pump characteristics be specified. System drag and losses are calculated to determine required flow rate and pump head and the corresponding pump speed, efficiency and required power are determined.
Results of design optimization for a series of similar craft are presented and show a strong sensitivity to the input estimate of the take-off drag. Sensitivity to starting values of the independent variables was noted in some cases and appears to be due to the fact that jet velocity ratio dominates the other independent variables as an influence on total system weight.
John Lawlor, Sun Shipbuilding & Dry Dock Company, coordinated the meeting for the local Section.
Discussers included K.C. Thornton, J.J.
Henry Company; F. Collison, Sun Shipbuilding and Dry Dock Company, and S.S. Morse, Arco.
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Content
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- Cordon International To Supply Equipment For Three LNG Ships page: 6
- Sixth VLCC Delivered By Kockums To Salen Features Roller Bearing Design For Shaft page: 7
- Admiral Payne To Succeed Admiral Brockett At Webb page: 7
- NASSCO Launches Largest Vessel Ever Built On West Coast page: 7
- Walter Thorsen, Inc. Named Exclusive Rep For Eleusis Shipyards page: 8
- Ogden Marine, Inc. Buys Two Tankers page: 10
- Oceans International Announces Merger And Expansion Plans page: 10
- Aluminum Tanks And LNG Ship Steel Hulls To Be Joined By Using Du Pont Detacouple Explosion Bonded Welding Transition Joints page: 11
- McAllister Orders Three 4,290-Hp Tugs page: 11
- Delta SS Awards Contract To Equitable For 50 LASH Barges page: 12
- Bethlehem Begins Construction On 265,000-Dwt Tanker —Largest Vessel Built In The United States page: 12
- Arthur Levy Boat Service Announces New Appointments For Thomas And LeBlanc page: 12
- Greek Committee Established By Det norske Veritas page: 13
- Esso Norway Test Of Hull Structure Proves Design And Good Workmanship page: 14
- Todd President Sees U.S. Shipbuilders Improving Competitive Position page: 14
- Society Of Marine Port Engineers N.Y. Discuss Care Of Turbine And Hydraulic Oil Systems page: 14
- Harwich Tonnage, Inc. Formed In California page: 15
- K.W. Waldorf Named To New Zapata Post page: 15
- Bigger, Bigger . . . Bigger page: 18
- USMMA At Kings Point To Admit Women page: 19
- Storm Awards Contract To Bethlehem Beaumont Shipyard For Offshore Drilling Rig page: 20
- NASSCO Expanding Facilities To Build 150,000-Ton Tankers page: 20
- NASSCO Delivers S/S Coronado— First Of Three For Margate Shipping page: 21
- SNAME N.Y. Metropolitan Section Hears Technical Paper On 'New Approach To The Ship Hull Characteristics Problem' page: 21
- ASNE Annual Meeting Set For May 2-3 In Washington, D.C. page: 21
- Experimental LNG Carrier Will Evaluate Two Tank Systems Under Operating Conditions page: 24
- International Ship Suppliers To Meet In Washington, D.C. September 22-26 page: 24
- Thomas B. Crowley Elected President At Western Shipbuilding Ass'n Annual Meeting page: 24
- Whitehouse To Head ABStech Regional Office In Houston page: 25
- Colt Industries Names Nidenberg page: 25
- FMD Appoints Sanchez To Direct Field Operations page: 25
- Alco Engines Names Comeng Holdings Ltd. Australian Licensee page: 25
- Magnavox Announces New Integrated Navigation System page: 28
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- Sea Trials And Launching Ceremonies Held For AMOCO Tankers At Astilleros Espanoles page: 28
- Halter Delivers New York Pilot Boat page: 29
- Ametco Shipping Elects J.E. Hundt President page: 29
- World Dredging Ass'n New Midwest Chapter To Meet February 28 page: 29
- Wiley And Clyde Iron Now Division Of AMCA Int'l —AMCA Sales $100 Million page: 30
- Kaiser To Build LNG Tanks For Oceangoing Ships On Pinto Island In Mobile Bay page: 30
- Eleusis Shipyards Launches Largest Vessel Built In Greece page: 31
- Paclines To Carry Cargo California To Hawaii Using Tug And Superbarge page: 31
- L. Arthur Strenkert Named Sales Manager Smit Nymegen Corp. page: 31
- Magnavox Announces Offshore Drill Rig Positioning System page: 31
- Paul J. Evanson Appointed Controller Moore And McCormack page: 32
- Paper On Water jet Propulsion Discussed During SNAME Philadelphia Section Meeting page: 32
- Mainland China Places Order Worth $2 Million For Rucker Petroleum Drilling Equipment page: 33
- Pittsburgh-Des Moines Orders Large Quantity Of Aluminum For LNG Ship And Land Use page: 33
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- Drew Chemical Names Rogers Managing Director New So. Africa Subsidiary page: 33
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- SNAME Players Perform At Pacific Northwest Section's 27th Annual Fall Meeting page: 33
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- Liberian Services —Consulting Firm Elects Wiswall Pres. page: 35
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- Management Changes At Dearborn-Storm page: 36
- Tanker Management Firm Promotes Nichols page: 36
- DOD Management Of Energy Resources Highlights Naval Engineers Meeting page: 37
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- Storehouse Of Information Readily Available From ABS Using Computerized Retrieval page: 42