Boundary layer similar parameter simulation method for accurately predicting acoustic load of cavity flow
A technology with similar parameters and simulation methods, applied in the field of cross research, it can solve the problems of large error of cavity flow and acoustic load data, low accuracy, and difficulty in establishing simulation methods, so as to improve the simulation ability and improve the research efficiency.
A technology with similar parameters and simulation methods, applied in the field of cross research, it can solve the problems of large error of cavity flow and acoustic load data, low accuracy, and difficulty in establishing simulation methods, so as to improve the simulation ability and improve the research efficiency.
CN112985755AActive Publication Date: 2021-06-18INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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[0033] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.
[0034]Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.
[0035] In this example Figure 2-Figure 5 , where the abscissa X / L represents the relative position in the cavity, CP is the static pressure coefficient, and SPL is the sound pressure level (in dB).
[0036] This embodiment is implemented through the following processes:
[0037] 1. Extraction of characteristic parameters of incoming flow boundary layer
[0038] Since the thickness of the incoming flow boundary layer and the shape factor of ...
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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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Patent Timeline
18 Jun 2021
Publication
CN112985755A
- IPC
- G01M9/08; G01M9/02; G01M9/06
- CPC
- G01M9/02; G01M9/06; G01M9/08
- Inventors
- 杨党国; 路波