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.
Other stories from February 15, 1974 issue
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- Walter Thorsen, Inc. Named Exclusive Rep For Eleusis Shipyards page: 8
- Oceans International Announces Merger And Expansion Plans page: 10
- McAllister Orders Three 4,290-Hp Tugs page: 11
- 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
- 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
- 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
- Thomas B. Crowley Elected President At Western Shipbuilding Ass'n Annual Meeting page: 24
- FMD Appoints Sanchez To Direct Field Operations page: 25
- Alco Engines Names Comeng Holdings Ltd. Australian Licensee page: 25
- Friede & Goldman Inc. Design Zapata Rigs Building At Avondale page: 28
- Sea Trials And Launching Ceremonies Held For AMOCO Tankers At Astilleros Espanoles page: 28
- Ametco Shipping Elects J.E. Hundt President page: 29
- World Dredging Ass'n New Midwest Chapter To Meet February 28 page: 29
- L. Arthur Strenkert Named Sales Manager Smit Nymegen Corp. page: 31
- Magnavox Announces Offshore Drill Rig Positioning System page: 31
- Paper On Water jet Propulsion Discussed During SNAME Philadelphia Section Meeting page: 32
- Worthington Service Corp. Names Budrick And lennings page: 33
- Zapata Corporation Reports Record Results page: 33
- Drew Chemical Names Rogers Managing Director New So. Africa Subsidiary page: 33
- Luckenbach To Build New Tampa Terminal page: 33
- SNAME Players Perform At Pacific Northwest Section's 27th Annual Fall Meeting page: 33
- David O'Neil To Head New Firm Of Marine Propulsion Consultants page: 34
- Liberian Services —Consulting Firm Elects Wiswall Pres. page: 35
- Diamond M Orders Two Jackup Rigs And A Semisubmersible page: 35
- Management Changes At Dearborn-Storm page: 36
- Tanker Management Firm Promotes Nichols page: 36
- Raytheon Company Submarine Signal Div. Appoints R.G. Popovici page: 38
- Berwind Lines Names Bericochea Exec. VP page: 38