A turbine pump inducer cavitation flow numerical prediction method based on low-temperature fluid

Abstract

The invention discloses a turbine pump inducer cavitation flow numerical prediction method based on low-temperature fluid, and belongs to the technical field of impeller machinery. The implementationmethod comprises the following steps: establishing an inducer model and an inlet and outlet runner model according to actual working conditions, and dividing grids; Establishing a computational fluidmechanics model, carrying out rotation correction on the turbulence model, and carrying out thermodynamic correction on the cavitation model; Setting and calculating boundary conditions of the single-phase steady flow to obtain a single-phase result; Calculating two-phase steady flow by taking a single-phase result as an initial value, and then changing inlet pressure and outlet mass flow to obtain calculation results of different working conditions; Calculating unsteady flow of the two phases by taking the two-phase steady result as an initial value to obtain an unsteady calculation result; By analyzing a calculation result, accurate flow field characteristic distribution, inducer performance and radial force dynamic characteristics of the inducer under the action of a flow field are obtained, the inducer is assisted to be designed and optimized, and the experiment cost and time are saved.

Description

technical field [0001] The invention relates to a method for numerically predicting the cavitation flow of a turbine pump inducer based on cryogenic fluid, and belongs to the technical field of turbomachinery. Background technique [0002] At present, the working medium and temperature of hydraulic machinery are not limited to normal temperature water. The turbopump, which is the core of the liquid rocket engine, uses cryogenic fluids such as liquid hydrogen and liquid oxygen as the flow medium. The cavitation condition of cryogenic fluid has always been one of the main constraints in the development of turbopumps. When cavitation occurs, the load of the turbo pump will decrease sharply, and cause severe vibration, causing damage to the rotor system of the turbo pump, especially when the turbo pump operates in a complex environment such as low temperature, high pressure, and high speed. The inducer is installed in front to increase the inlet pressure of the turbo pump and ...

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Problems solved by technology

[0005] In view of the fact that the existing calculation method for the cryogenic fluid of the inducer is not comprehensive enough and cannot meet the cavitation problem of the aerospace turbo pump, the technical problem to be solved by a numerical prediction method for the cavitation flow of the turbo pump inducer based on the cryogenic fluid disclosed by the present invention is: According to the thermodynamic properties of cryogenic fluid and the extremely low working temperature, the formation and development mechanism of cavitation can be studied, and high-precision numerical prediction of the flow phenomenon of wheel cavitation induced by cryogenic fluid can be realized.

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