Abstract
Electronic expansion valve is one of the sources of noise in the operation of air conditioner. In order to suppress the noise, a structure with spiral guide vane downstream is proposed in this paper. For the noise problem caused by electronic expansion valve, the valve under different pressure difference is numerically analyzed. The reliability of the simulation is verified by experiments, and the noise of the prototype and the optimization model are compared and analyzed. The results show that the two-phase flow noise increases with the increase of the pressure difference between the inlet and outlet of the electronic expansion valve. When the pressure difference increases from 1 MPa to 2.5 MPa, the noise increases from 90.84 dB to 102.03 dB. The upstream flow of the valve is stable and there is no cavitation noise. Therefore, the noise upstream of the valve can be ignored. While the noise is mainly generated in the downstream area of the valve, and the noise is symmetrically distributed. The distribution is characterized by small noise in the center and near the wall, and there is a maximum noise in the middle. Compared with the original model, in the optimization model, the gas volume fraction in the flow field increased and the maximum noise decreased by 13 dB.
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