Abstract: Finned heat exchanger is widely used in air conditioning. Its fins will form an open cavity. When the fluid passes through the cavity, it is easy to produce a high-frequency whistling sound, which affects the user experience. Aiming at the problem of heat exchanger whistling sound of an embedded air conditioner with four air outlets, the air duct flow field is numerically simulated, the causes of heat exchanger whistling sound are analyzed, the spoiler is designed to optimize the heat exchanger whistling sound, and the noise experiment is carried out in the semi anechoic noise room. The effectiveness of heat exchanger whistling sound improvement is explained from the spectrum and subjective evaluation.

Key words: Numerical simulation, Spoiler, Heat exchanger whistle