Abstract: The strong pressure pulsation in the vapor-injection tube of scroll compressor is easy to resonate with the injection valve, resulting in valve body damage. To solve this problem, CFD simulation is used to study the generation and propagation mechanism of pressure pulsation in the vapor-injection tube. Based on the mechanism of pressure pulsation, the technical schemes of pressure fluctuation attenuation, such as optimization of the holes'shape and number, are put forward. Through the pressure fluctuation test, it is found that the reduction in OA value (0~1000 Hz) of ARI condition for all the proposed schemes is 30% on average, which verifies the effectiveness of the mechanism analysis and proposed CFD method. The study can provide theoretical basis and specific scheme for improving the vibration and noise caused by pressure pulsation of the vapor-injection scroll compressor, and can be applied to other scroll compressors.

Key words: Vapor-injection, Pressure pulsation, Scroll compressor, CFD computation, Air conditioner