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Physical Modal for Acoustic Resonance Based on the Circular Cavity Structure in the Compressor


 On the basis of the rectangular cavity plate model, the Parker resonance phenomenon is investigated by using the present calculation method, which verifies the effectiveness of the numerical calculation method adopted in the paper. Acoustic resonance occurs in the multistage compressor. The acoustic resonance frequency will be locked in a specific range which presents no variation in the rotating speed. The propagation status of the sound source of the acoustic resonance frequency should be from back to forward with a helical shape. The research method of the characteristics and mechanism of the acoustic resonance is proposed based on the annular cavity structure with the numerical simulation. The calculation models of the flow field and the sound field are established. The criterion of the sound resonating with the cavity and the characteristic condition when acoustic resonance occurred in the annular cavity structure is confirmed. The theoretical model of the acoustic resonance which is developed in the paper will be useful for the the three-dimensional model investigation into the acoustic resonance in the compressor, which can provide the better exhibition of the coupling relationship between the acoustic mode in the cavity and the vibration mode of the structure when the acoustic resonance occurs.