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A pump-jet, hydrojet, or water jet is a marine system that produces a jet of water for propulsion. The 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 designs. The design also incorporates an intake to provide water to the pump and a nozzle to direct the flow of water out of the pump.
A pump-jet works by having an intake (usually at the bottom of the hull) that allows water to pass underneath the vessel into the engines. Water enters the pump through this inlet. The pump can be of a centrifugal design for high speeds, or an axial flow pump for low to medium speeds. The water pressure inside the inlet is increased by the pump and forced backwards through a nozzle. With the use of a reversing bucket, reverse thrust can also be achieved for faring backwards, quickly and without the need to change gear or adjust engine thrust. The reversing bucket can also be used to help slow the ship down when braking. This feature is the main reason pump jets are so maneuverable.
The nozzle also provides the steering of the pump-jets. Plates, similar to rudders, can be attached to the nozzle in order to redirect the water flow port and starboard. In a way, this is similar to the principles of air thrust vectoring, a technique which has long been used in launch vehicles (rockets and missiles) then later in military jet-powered aircraft. This provides pumpjet-powered ships with superior agility at sea. Another advantage is that when faring backwards by using the reversing bucket, steering is not inverted, as opposed to propeller-powered ships.
An axial-flow waterjet's pressure is increased by diffusing the flow as it passes through the impeller blades and stator vanes. The pump nozzle then converts this pressure energy into velocity, thus producing thrust.
Axial-flow waterjets produce high volumes at lower velocity, making them well suited to larger low to medium speed craft, the exception being personal water craft, where the high water volumes create tremendous thrust and acceleration as well as high top speeds. But these craft also have high power-to-weight ratios compared to most marine craft. Axial-flow waterjets are by far the most common type of pump.
Mixed-flow waterjet designs incorporate aspects of both axial flow and centrifugal flow pumps. Pressure is developed by both diffusion and radial outflow. Mixed flow designs produce lower volumes of water at high velocity making them suited for small to moderate craft sizes and higher speeds. Common uses include high speed pleasure craft and waterjets for shallow water river racing (see River Marathon).
Centrifugal-flow waterjet designs make use of radial flow to create water pressure.
Centrifugal designs are not commonly used anymore except on outboard sterndrives.
Pump jets have some advantages over bare propellers for certain applications, usually related to requirements for high-speed or shallow-draft operations. These include:
- Higher speed before the onset of cavitation, because of the raised internal dynamic pressure
- High power density (with respect to volume) of both the propulsor and the prime mover (because a smaller, higher-speed unit can be used)
- Protection of the rotating element, making operation safer around swimmers and aquatic life
- Improved shallow-water operations, because only the inlet needs to be submerged
- Increased maneuverability, by adding a steerable nozzle to create vectored thrust
- Noise reduction, resulting in a low sonar signature; this particular system has little in common with other pump-jet propulsors and is also known as "shrouded propeller configuration"; applications:
- Warships designed for low observability, for example the Swedish Visby-class corvette.
- Submarines, for example the Royal Navy Trafalgar class and Astute class, the US Navy Seawolf class and Virginia class, the French Navy Triomphant class and Barracuda class, and the Russian Navy Borei class.
- Modern torpedoes, such as the Spearfish, the Mk 48 and Mk 50 weapons.
The Italian inventor Secondo Campini showed the first functioning man-made pump-jet engine in Venice in 1931. However, he never applied for a patent, and since the device suffered from material problems resulting in a short life-span, it never became a commercial product. The first person to achieve that was New Zealand inventor Sir William Hamilton in 1955.
Pump-jets were once limited to high-speed pleasure craft (such as jet skis and jet boats) and other small vessels, but since 2000 the desire for high-speed vessels has increased and thus the pump-jet is gaining popularity on larger craft, military vessels and ferries. On these larger craft, they can be powered by diesel engines or gas turbines. Speeds of up to 40 knots (45 mph; 75 km/h) can be achieved with this configuration, even with a displacement hull.
Pump-jet powered ships are very maneuverable. Examples of ships using pumpjets are the fast patrol boat Dvora Mk-III craft, Car Nicobar-class patrol vessels, the Hamina-class missile boats, Valour-class frigates, the Stena High-speed Sea Service ferries, the United States Seawolf-class and Virginia-class submarines, and the United States littoral combat ships.
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- Charles Dawson, "The Early History of the Water-jet Engine", "Industrial Heritage", Vol. 30, No 3, 2004, page 36.
- David S. Yetman, "Without A Prop", DogEar Publishers, 2010