Design method of an axial flow high power density water jet propulsion pump

Abstract

The invention discloses a design method of an axial-flow-type high-power density water jet propulsion pump, and belongs to the technical field of impeller machinery. The implementation method comprises the steps that after the performance of a power machine, the performance of a water jet propulsion system and the mutual influence of the water jet propulsion system and a carrier are comprehensively considered and main parameters of the water jet propulsion system are selected, an equal-head flow increasing method is adopted for determining a design working condition point of the water jet propulsion pump; the circulation distribution of the water jet propulsion pump is determined according to the lift line theory, the shape of the section of each blade is selected, the initial shape of each blade is determined, the final arched surface shape meeting the boundary conditions of the object plane of the arched surface of each blade is determined according to a lift surface method, shapingof the blades of the axial-flow-type water jet propulsion pump is completed, and the design of the high-power density water jet propulsion pump is achieved. By means of the method, the design accuracyof the design working condition point can be further improved, and the development cost of a new model is reduced; the design can be applied to the field of amphibious vehicles and ships to solve related engineering problems.

Description

technical field [0001] The invention relates to a design method of an axial-flow high-power-density water jet propulsion pump, which belongs to the technical field of impeller machinery. Background technique [0002] At present, water jet propulsion is an important guarantee to realize the technical index of water speed. As a special propulsion method, water jet propulsion does not directly generate thrust itself, but pushes the ship forward through the reaction force generated by jet water. The water jet propulsion device has the advantages of strong anti-cavitation performance, high efficiency, low noise, not easy to overload the main engine, small attachment resistance, stable operation, etc., and is widely used in high-speed ships, heavy-duty ships and amphibious vehicles. [0003] The core component of the water jet propulsion device is the water jet propulsion pump, and the main pump types are axial flow, mixed flow and centrifugal. Since the water outlet direction o...

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Problems solved by technology

[0005] Aiming at the problem that the current design method of the axial flow water jet propulsion pump cannot meet the high power density, the technical problem to be solved by the design method of the axial flow high power density water jet propulsion pump disclosed by the present invention is: for the axial flow The very complicated ternary flow inside the pump is calculated through the "lift line theory", and the final arch surface of the blade is solved by the "lift surface" method to complete the blade shape of the axial flow water jet propulsion pump, and realize high power density water spray Propulsion Pump Design

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