Analysis of vibration characteristics of automobile air conditioning piping system based on CFD

When air flows through pipelines, it will cause significant pressure loss, resulting in a sharp change in speed and direction, which in turn forms turbulence and generates noise. Taking the air duct pipeline of automotive air conditioning as the research object, the responses of computational fluid dynamics and aeroacoustics were studied based on the CFD method. Through comparative analysis, the characteristics of different turbulence models, discretization methods and solution algorithms and their applicable working conditions were discussed. Through the calculation of the flow field and sound field in the air conditioning duct pipeline, the causes of pressure loss and aerodynamic noise generation within the duct pipeline were explored. Through spectral analysis, it can be known that the aerodynamic noise within the duct pipeline has no obvious main frequency and belongs to broadband noise.