A New Pumpjet Design Theory
Abstract
The pumpjet is considered to be one of the most promising candidate propulsors for high speed underwater vehicles and, as a matter of fact, it has recently been employed for MK 48 torpedoes, ALWT Advanced Light Weight Torpedo, now called MK 50 and other underwater vehicles. The pumpjet superiority over other propulsion devices is represented by two major factors, i.e., high efficiency and quietness. The pumpjet is one of few fluid devices which positively utilizes retarded wake flow and produces high propulsive efficiency. This peculiar situation may be understood readily by considering the momentum equation applied to a control volume surrounding an underwater vehicle, fixed to the inertial coordinate system. In the conventional propeller, for example, the velocity of flow coming into a propeller blade is approximately equal to the vehicle speed since the propeller diameter is large enough to enjoy the free stream flow. In order for the propeller to generate any effective thrust, it should accelerate the flow, the ejected flow speed being faster than the incoming flow.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1988
- Accession Number
- ADA201353
Entities
People
- Okitsugu Furuya
- Wen-li Chiang
Organizations
- Honeywell International, Inc.