Two Phase Water Jet Propulsion for High-Speed Vehicles

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.

1 . An apparatus for water propulsion, said apparatus comprising:
 a pump capable of pumping from a water source;   a nozzle in fluid communication with said pump, said nozzle including a first region capable of increasing a velocity of a water flow by a decreasing diameter of the nozzle and second region adjacent to and converging in diameter from said first region with said second region capable of producing a thrust based on the velocity of the water flow; and   a passageway communicating with an exhaust gas source and at a single point as an only point of passageway communication in said first region of said nozzle and prior to said second nozzle region such that the thrust is increasable by exhaust gas impacting the water flow.   
   
   
       2 . The apparatus in accordance with  claim 1  wherein said exhaust gas source is an engine. 
   
   
       3 . (canceled) 
   
   
       4 . (canceled) 
   
   
       5 . A device for water propulsion, said device comprising:
 a nozzle in fluid communication with a pump, said nozzle including a first region capable of being set to a first pressure and a second region adjacent to and converging in diameter from said first region, said second region capable of being set to a second pressure, wherein the first pressure is greater than the second pressure; and   a passageway communicating with a source of exhaust gas and at a single point as an only point of passageway communication within said first region of said nozzle, wherein said exhaust gas is combined with water in said first region to increase a thrust of the water propulsion based on a water flow within the nozzle.   
   
   
       6 . A method of increasing a thrust of a water propulsion apparatus, said method comprising the steps of:
 providing a pump;   producing an exhaust gas;   driving said pump;   providing a nozzle in fluid communication with said pump, said nozzle having a first region capable of increasing a velocity of flow of water and a second region adjacent to and converging in diameter from the first region, the second region capable of expanding the flow of water;   introducing the exhaust gas at a single point as an only point of the exhaust gas introduction in the first nozzle region while the velocity is being increased and prior to the second nozzle region wherein the water is being expanded; and   increasing a thrust by an increase in velocity resulting from the exhaust gas introduced at the point in the first nozzle.