Method for forecasting cavitation induced noise values of vane pumps

Abstract

The invention provides a method for forecasting cavitation induced noise values of vane pumps, and aims at calculating inside and outside radiation noises, which undergo cavitation, of vane pumps in low-pressure or large-flow occasions. The method comprises the following steps of: modeling a flow field domain and a pump shell, carrying out mesh generation on the flow field domain and checking mesh quality, setting a pressure inlet and a speed outlet boundary condition according to specific operation parameters of a pump, setting a solver parameters, and calculating non-cavitated constant file; carrying out constant iterative calculation to obtain a cavitation numerical value result file under each cavitation number, and carrying out turbulence model verification and cavitation model verification on models; carrying out inconstant iterative calculating by taking the constant result file which is added with a cavitation model as an initial value of cavitation inconstant calculation, so as to obtain a pulse and mesh information file included under each cavitation number; and calculating a cavitation induced noise of the vane pump by applying a coupled algorithm of a sound analogy theory and a boundary element method in acoustic calculation software. The method is capable of correctly carrying out cavitation induced noise forecasting.

Description

technical field [0001] The patent of the invention belongs to the field of cavitation noise calculation of fluid machinery, and is a numerical prediction method of cavitation-induced noise of vane pumps. Background technique [0002] As a transducing device used in various fields of the national economy, the vane pump is an important strategic equipment related to the national economy, the people's livelihood and national security. Cavitation, as the core of the key issues in the development of vane pump engineering, restricts its development in the direction of high reliability and high stability. Due to the complexity of the cavitation mechanism, numerical calculation methods have gradually replaced real machine experiments as one of the main means of cavitation research. [0003] The numerical simulation of cavitation is affected by the multiphase flow model, turbulence model, cavitation model and various fluid parameters. Therefore, in order to predict the cavitation-in...

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Problems solved by technology

At present, the research on cavitation noise mainly focuses on the theoretical prediction of pulsed radiation noise caused by the collapse of a single spherical cavity. Cavitation-induced noise cannot be accurately calculated

However, the high-frequency noise energy generated by cavitation collapses attenuates quickly, and the low-frequency noise energy spreads stronger, which is more harmful to the reliability and stability of the vane pump operation. Therefore, the numerical prediction of the cavitation-induced noise of the vane pump is an important research problem

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