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Two Phase Water Jet Propulsion for High-Speed Vehicles

a high-speed vehicle and water jet technology, applied in water-borne vessels, marine propulsion, vessel construction, etc., can solve the problems of not increasing the efficiency not increasing the thrust of the water propulsion system, and creating exhaust noise, etc., to achieve the effect of increasing the thrust of the water propulsion apparatus

Inactive Publication Date: 2009-04-16
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]In a further embodiment, the present invention includes a method of increasing the thrust of a water propulsion apparatus. The method includes the steps of providing an engine that produces an exhaust gas, providing a nozzle having a first region which increases the water flow velocity and a second region which subsequently expands the water, and introducing the exhaust gas at a point in the first nozzle region while the water flow velocity is being increased and prior to the second nozzle region wherein the water is being expanded.

Problems solved by technology

In the exhaust systems where the exhaust gas is discharged into the atmosphere, the exhaust noise creates a problem.
While introducing the exhaust gas into the low-pressure region (after the water has expanded) reduces the sounds waves (noise level), this does not increase the efficiency of the water propulsion system or increase thrust of the water propulsion system.

Method used

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  • Two Phase Water Jet Propulsion for High-Speed Vehicles
  • Two Phase Water Jet Propulsion for High-Speed Vehicles
  • Two Phase Water Jet Propulsion for High-Speed Vehicles

Examples

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Embodiment Construction

[0014]Referring now to FIG. 1, a water propulsion apparatus 10 in accordance with the present invention, generally includes an exhaust gas source 12, a nozzle 14 and a gas passageway 15. The exhaust gas source 12 is preferably an engine, though other gas producing sources would be recognizable to those skilled in the art. In a preferred embodiment, the engine is a diesel engine, a hot gas piston expander or a gasoline engine but not limited to, a two stroke engine or a four stroke engine.

[0015]The engine 12 drives a pump 16, typically a high-speed centrifugal pump, via a drive means 17 (such as, but not limited to, a drive shaft, transmission, drive belt, etc.) that displaces water through a water intake 18 from a water source (not shown), through the pump 16, and into the nozzle 14. As the speed of the pump 16 is increased, the amount of water displaced, the mass flow rate “M”, is increased. For a given pump speed, the pump 16 will substantially have a constant mass flow rate M.

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Abstract

A water jet propulsion apparatus having an engine producing an exhaust gas, a pump driven by the engine, a nozzle in fluid communication with the pump, and an exhaust passageway communicating between the engine and the nozzle is disclosed. The exhaust passageway is connected the nozzle at a point in the nozzle where the water flow velocity is being increased, and prior to the water being expanded. By mixing the exhaust with the water while the water flow velocity is being increased, the result is a decrease the density of the mixture and an increase the total mass flow rate, thus resulting in increased thrust.

Description

STATEMENT OF GOVERNMENT INTEREST[0001]The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefore.CROSS REFERENCE TO OTHER PATENT APPLICATIONS[0002]None.BACKGROUND OF THE INVENTION[0003](1) Field of the Invention[0004]The present invention relates to a water propulsion apparatus, and more particularly to a two phase water jet propulsion apparatus.[0005](2) Description of the Prior Art[0006]In a typical water propulsion system, the system employs a pump connected to a nozzle. The pump, usually a high speed centrifugal water pump, is driven by an engine such as a two stroke gasoline engine, four stroke gasoline engine, or a diesel engine. The system produces thrust by first increasing velocity of the water flow, and subsequently expanding the water flow.[0007]The engine used to pump the water in the water propulsion system generates exhaust gas a...

Claims

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Application Information

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IPC IPC(8): B63H11/14
CPCB63H11/14
Inventor DUNN, PAUL M.
Owner THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY