Boundary layer similar parameter simulation method for accurately predicting acoustic load of cavity flow

Abstract

The invention discloses a boundary layer similar parameter simulation method for accurately predicting a cavity flow acoustic load. The boundary layer similar parameter simulation method comprises the following four steps: extracting incoming flow boundary layer characteristic parameters, determining incoming flow boundary layer similar parameters, simulating the incoming flow boundary layer similar parameters and simulating the range of the incoming flow boundary layer similar parameters. Starting from aerodynamics, acoustics and experimental fluid mechanics simulation principles, the method provides a theoretical basis for constructing cavity flow acoustic load to accurately predict incoming flow boundary layer parameter simulation, and has a positive guiding effect on cavity flow acoustic load ground wind tunnel test to measure incoming flow boundary layer parameter simulation, so that the research efficiency can be improved, an incoming flow boundary layer similar parameter simulation range suitable for cavity flow acoustic load prediction is given, a supporting effect can be provided for accurately obtaining cavity flow acoustic load test data, the method is closer to an actual problem of a cavity on an airplane in a real environment, and the simulation capability of the cavity flow acoustic load prediction problem is improved.

Description

technical field [0001] The invention relates to the interdisciplinary research fields of aerodynamics and acoustics, in particular to a boundary layer similar parameter simulation method for accurately predicting cavity flow acoustic load. Background technique [0002] The cavity structure widely exists in the field of aerospace and navigation, and is a typical structural form that is indispensable and commonly used in aerospace and navigation equipment. It is mainly used for combat weapon loading, power fuel storage and landing gear storage (such as weapon bomb bay , landing gear cabin, transport cabin, body gap / small-scale cavity, combustion chamber, etc.), usually have the characteristics of many geometric parameters, complex structure, unconventional configuration, and harsh working environment. Under high-speed conditions, the flow around the cavity can easily induce high-strength hydrodynamic pulsations, and the thin-walled structure of the excitation cavity is likely ...

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Problems solved by technology

[0006] First, there is a lack of a similar theory for the simulation of the incoming flow boundary layer at the leading edge of the cavity, which makes it difficult to obtain a theoretical basis for the scaled cavity test; the second is the lack of reasonable and effective simulation of the incoming flow boundary layer at the leading edge of the cavity. Similar parameters make it difficult to establish a simulation method in the cavity flow acoustic load prediction test; the third is the lack of simulation range and requirements for similar parameters of the boundary layer, resulting in large data errors, low accuracy, and inaccurate data of the cavity flow acoustic load, which seriously restricts Optimized cavity structure design and safety assessment

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