Abstract
The purpose of this study is reduction of the BPF noise in the engine cooling fan with generally eccentric shroud. With the increase of HV and EV, noise reduction demand has been increased. In addition, fan systems which radiator and the engine cooling fan do not have the same center is increasing. Therefore, the shroud shapes have become complicated and non-axial symmetric (eccentric). By previous report, it was suggested the solution of reduction BPF noise in the eccentric shroud by comparing the difference of sound source position and flow structure by comparing the square and eccentric shroud. This paper described the flow mechanisms of noise reduction about improved shroud by measurement of pressure and Computational Fluid Dynamics (CFD) analysis.
