Image acquisition method for measuring pulsating pressure and noise of cavity model

Abstract

The invention discloses an image acquisition method for measuring pulsating pressure and noise of a cavity model. The method measures and calculates the pulsating pressure and noise of the cavity model based on a fast response pressure-sensitive paint technology and an image processing technology, and does not need a sensor for measurement, so that the installation of the sensor on the cavity model can be avoided, and thus, the design difficulty and the processing difficulty of the cavity model can be simplified, and the design cost and the processing cost of a model are reduced. In addition, surface measurement of a cavity surface area can be carried out, the spatial resolution is high, and global cavity pulsating pressure and noise data spectra can be obtained.

Description

technical field [0001] The application belongs to the technical field of wind tunnel optical measurement experiments, and in particular relates to an image acquisition method for measuring pulsating pressure and noise of a cavity model. Background technique [0002] Cavity structures are widely used in various fields. For example, in the field of aerospace, the embedded weapon compartment of fighter jets, the landing gear compartment of airliners, and the concave cavity for stabilizing flames in the combustion chamber of scramjet engines all involve cavity structure. [0003] Among them, the aerodynamic problem caused by the unsteady flow of the cavity is a very complex aerodynamic phenomenon, which is likely to cause failures in advanced aircraft using cavity structures in the aerospace field. Therefore, it is necessary to analyze the pulsating pressure and Noise is measured to better study cavities to ensure the safety of advanced aircraft. [0004] In the prior art, the...

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Problems solved by technology

[0005] However, in the above process, although the measurement accuracy of the pulsation pressure sensor is high, there are still many defects: ①Because the pulsation sensor protrudes or is recessed on the inner surface of the cavity, it will interfere with the flow field of the cavity, resulting in pulsation pressure and noise The measurement is inaccurate, so the sensor is required to be strictly flush with the surface of the cavity model, which makes the installation of the pulsation pressure sensor more difficult

②Installing the pulsating pressure sensor requires drilling and slotting the cavity model at the installation location and wiring channel, which increases the difficulty of model design and processing, and increases the cost of model design and processing

③The pulsating pressure sensor can only measure several points on the surface of the cavity, and the spatial resolution is very low, so it cannot meet the requirements of global surface measurement, and cannot obtain the acoustic characteristics and flow field structure details of the global cavity

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