Hydraulic model and design method of a pump-jet propeller with asymmetric circumferential arrangement of front stator

Abstract

The invention discloses a pumpjetpropulsor hydraulic model with front stators circumferentially and asymmetrically arranged and a design method thereof. The pumpjetpropulsor hydraulic model comprises stator blades, a stator hub, impeller blades, an impeller hub and a guide tube. The stator blades are circumferentially and asymmetrically arranged on the stator hub, and blade tips of the stator blades are fixed to the inner wall face of the guide tube. The axis of the stator hub, the axis of the impeller hub and the axis of the guide tube coincide. The impeller blades have the characteristics of large side skewing and tail longitudinal inclination. The pitch angles of the stator blades are changed according to the sine rule on the basis of the pitch angles of reference pumpjet stator blades, and the change quantity of the pitch angles is related to the circumferential angle positions of the stator blades, impeller turning directions and amplitude coefficients. According to the pumpjetpropulsor hydraulic model with front stators circumferentially and asymmetrically arranged and the design method thereof, the amplitude of pumpjet pulsation thrust coefficients can be reduced, pumpjet radiation noise is lowered, and the pulsation thrust coefficients of the pumpjet with the front stators circumferentially and asymmetrically arranged are reduced by 3.4% compared with a reference pumpjet under the same design condition. The technical measure is also suitable for noise optimization design of shaftless driving type integration motor pumpjet hydraulic models.

Description

Technical field [0001] The present invention relates to the technical field of ship propulsion, in particular to a pump jet propulsion device with low noise and high critical speed characteristics, which can be used for propelling an underwater vehicle. Background technique [0002] Pumpjet (Pumpjet, referred to as pump jet) is widely used in low-noise submarine propulsion because of its low radiation noise and high critical speed. For example, the "Seawolf-class" submarine and the "Virginia-class" submarine both use front Set stator pump spray. At present, the United States, Britain, France and Russia have all applied pump-jet propulsion technology to nuclear submarine propulsion. The main reason why pump-jet submarines have not been in service in China is the lack of excellent pump-jet hydraulic models. The specific meaning of excellent is: low radiation noise, moderate propulsion efficiency, high critical speed (that is, strong anti-cavitation ability) (a design method of a s...

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Problems solved by technology

In the above two patent schemes, the blade profile and pitch angle have not changed

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