2 edition of Optimization of water-jet propulsion system for surface effect ships found in the catalog.
by Massachusetts Institute of Technology
Written in English
Last, fast ships are certainly possible (military vessels have had circa kt capability for decades), but again the economic model is incomplete--a 50 kt ship requires times the horsepower of a 25 kt cargo ship--and thus times the operating costs (from fuel to amortization of equipment), and a whopping 10 times the horsepower of a Marine propellers are one of the main components of a ship propulsion plant. Their performance, primarily in terms of efficiency, is a key point for a proper propulsion system design. New stringent requirements for ship operability (including, for instance, response to off-design conditions or dynamic positioning), and even stricter limits.
COMPARISON OF THRKE THEORIES OF WATER-JET PROPULSION INTRODUCTION The Ü. S. Navy Marine Engineering Laboratory is assisting the David Taylor Model Basin in the machinery aspects of the surface effects ship and hydrofoil pro- grams. Both of these programs may utilize water jets as the main propulsion method. Experimental and CFD Analysis for Rotor-Stator Interaction of a Waterjet Pump H. H. Chun, W. G. Park, and J. G. Jun (Pusan National University, Korea) ABSTRACT The numerical analysis of a waterjet propulsion system was performed to provide a detail understanding of complicated three-dimensional viscous flow phenomena including the interactions.
Water jet propulsion, Thrust paradox, Pump system, Nozzle. 1. Introduction. A water jet propulsion system is a new kind of propeller device that is extensively used in new marine vehicles such as surface effect ships, techno super liners, hydrofoil crafts, amphibious military vehicle and so on. t Ihas many advantages over a conventional. The waterjet propulsion system has a lower propulsive coefficient than standard propulsion systems at low speeds. The thrust force is dependent on the change in momentum, and the water-jet develops less thrust at low and intermediate speeds because of the inherent difficulty it has in handling large mass flow rates at low speeds, whereas the.
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TABLEOFCONTENTS TitlePage 1 Abstract 2 TableofContents 3 ListofFiguresandTables 4 ListofSynbolsUsedinText; 5 Chapter1. Introduction 8 Chapter2 SystemDescription, 11 Chapter3. DevelopmentofEquations, 14 Chapter4.
Pumps,ReductionGears,andEngines,21 4. 1 Pumps 21 ReductionGears 27 Engines. 29 Chapter5» Results, 31 Chapter6. Headlossbetweendiffuserexitand ft ^ pumpinlet h Heightofpumpaboveinlet ft h Changeinheightbetweendiffuser ft ^e exitandthepumpentrance H Changeofheadacrosspump ft H, Headatentrancetopump ft Hp Headatpumpexit ft Hp Headatdiffuserexit ft Hnoz„ Change°ofheadacrossnozzle ft H.
Changeofheadacrosspump-to-nozzleft pipe ° rr *r pipe HP. optimization of waterjet propulsion systems for surface effect ships Water-jet propulsion systems using flush inlets suitable for use on surface effect ships are studied.
Equations are developed and incorporated into a computer program which optimizes the system on a least total weight basis. The concept of water-jet propulsion dates back to when Toogood and Hays ﬁrst proposed this form of propulsion.
Waterjet propulsion is often choosen instead of conventional propellers for vessels requiring high speeds, shallow draught, protected propulsion, high manoeuvrability at all speeds, low noise emissions for military applications and low vibration.
Optimization of Waterjet Propulsion for High-Speed Ships. Numerical Simulation on Hydraulic Characteristics of Nozzle in Waterjet Propulsion System. 3 December | Processes, Vol.
7, No. Test and evaluation of U.S. Navy ton surface effect by: 4. Both the original and the optimized intake duct are used in combination with a mixed-flow waterjet propulsion system in order to analyze the effect of intake duct on the waterjet pump and the system.
The three-dimensional computational domain is shown in Fig. 14, including the water tank, the intake duct, the mixed-flow waterjet pump and the.
SFS is the acronym for the Surface Effect Fast Sealift Ship, a 20,ton, surface effect ship (SES). The SFS acronym was chosen to distinguish it from the smaller,ton, SES craft. As we know that Jet propulsion means the propulsion or movement of the bodies such as ships, aircraft, rocket etc., with the help of jet.
The reaction of the jet, coming out from the orifice provided in the bodies, is used to move the bodies. Now, the energy storage systems appear to be the most limiting technologies for the electric propulsion, but the interests of researchers are now focused on the development of new battery technologies [5,6] and in the use of some optimization procedure for the weight reduction of optimization distribution of energy storage systems [7,8,9, Commercial Waterjets.
Thrustmaster is a leading designer and manufacturer of waterjet propulsion systems focused on offering high-quality waterjet products that excel in the harsh operating conditions of the commercial and military marine market.
With over 40 years of experience, Thrustmaster’s expertise in waterjet propulsion mixed with Thrustmater’s engineering and manufacturing. Virtual simulation of ship propelled with waterjets became important for the optimization of the dynamic characteristics of the propulsion and to set the propulsion controller strategies [11–14].
Also this technique requires the knowledge of design information concerning the waterjet system. A pump-jet, hydrojet, or water jet is a marine system that produces a jet of water for mechanical arrangement may be a ducted propeller (axial-flow pump), a centrifugal pump, or a mixed flow pump which is a combination of both centrifugal and axial design also incorporates an intake to provide water to the pump and a nozzle to direct the flow of water out of the pump.
As a major step toward achieving a knot capability at sea for the U.S. Navy and an integral part of an overall SES Program, the Surface Effect Ship, SESB, was conceived, built and tested. gained from the propulsion system of ship.
The using propulsion systems in marine vehicles are following categories. Such as 1. Screw propellers propulsion 2. Vertical axis propeller propulsion 3.
Water jet Propulsion 4. Paddle Wheels propulsion. In early time jet propulsion was simple but in modern era it is very sophisticated as well. Jet propulsion is the propulsion of an object in one direction, produced by ejecting a jet of fluid in the opposite direction.
By Newton's third law, the moving body is propelled in the opposite direction to the jet. Reaction engines operating on the principle of jet propulsion include the jet engine used for aircraft propulsion, the pump-jet used for marine propulsion, and the rocket engine.
For ships that frequently sail in shallow waters, in order to prevent debris from entering the waterjet propulsion pump and damaging the waterjet propulsion system, the intake grid is usually installed at the inlet of the inlet passage to ensure the normal operation of the propulsion et al.
conducted a numerical simulation study on. NASA Images Solar System Collection Ames Research Center. Brooklyn Museum. Full text of "Optimization of waterjet propulsion pumps for hydrofoil application.".
How a Waterjet Works A waterjet generates propulsive thrust from the reaction created when water is forced in a rearward direction. It works in relation to Newton’s Third Law of Motion – “every action has an equal and opposite reaction”.
A good example of this is the recoil felt on the shoulder when firing a rifle, or the thrust felt when holding a powerful firehose. A typical waterjet system includes a flush-mounted inlet channel guiding the water to the rotating pump impeller, a stationary guide vane package, an outlet nozzle and a steering/reversing mechanism.
The basic operating principle of waterjet propulsion is similar to that of a screw propeller system. Surface 2 is the imaginary streamtube, which separates the control volume from the flow field.
Surface 3 is the physical boundary of the waterjet system. Surface 4 is the surface between the stagnation lines and merge lines of hull and duct. Surface 5 is a section in the intake throat. Surface 6 is the nozzle section at the station 6. Aircraft propulsion, configuration and components: Lecture 17 (PDF) Aircraft engine modeling; turbojet engine: Lecture 18 (PDF) Turbojet engines (cont.); design parameters; effect of mass flow on thrust.
Lecture 19 (PDF) Introduction to component matching and off-design operation: Lecture 20 (PDF) Turbofan engines: Lecture In most surface vessels having waterjet propulsion systems, the pump is mounted within the hull adjacent the stern transom with at least a portion of the pump and the pump discharge nozzle above the surface of the water.
The water jet is discharged through a discharge conduit leading from the pump that passes through the transom and impinges on.propulsion systems- the waterjet. We will explain some aspects of waterjet propulsion, its optimization, and make some comparisons with propellers.
A typical high speed waterjet propulsion system is shown schematically in Fig. 1. It features an engine, a speed re-ducing gearbox, an inlet for the water, a pump, and a noz-zle.