YANG Weiping1, HOU Liang1, CAI Huikun1, LI Shengyu2

 

(1. School of Physics and Mechanical & Electrical Engineering, Xiamen University, Xiamen 361005, China;

 

2. Xiamen XGMA Machinery Co., Ltd., Xiamen 361023, China)

 

 

Abstract: Aiming at the problem that the noise level on the outlet side of the cooling fan exceeded the national standard seriously during the working process of an excavator,researches on the aerodynamic performances of revolving fan were carried out. Firstly, the finite element model of the fluid domain which was formed by the fan and the wind scooper was established. Steadystate numerical simulations for the flow field were conducted by using Fluent based on CFD theory. The effects of relevant structural parameters of fan and wind scooper on their blowing rate and noise level were explored respectively. Taking account of both wind and noise requirements,the most suitable type of fan and wind scooper for the excavator were obtained by using Optimiser,a cooling system selection software provided by the manufacturer. The optimization results indicate that the noise of optimized fan reduced 1.5dB compared to that of original one under the premise that it can provide the same wind as before. Then,transient simulations for the flow field were done to analyze the frequency performances of fan noise. The simulation results indicate that the rotation fan noise concentrates mainly on low frequency stage which guided the company to take noise reduction measures for this frequency band noise specifically.

 

Key words: computational fluid dynamics (CFD); excavator; cooling fan; wind scooper; noise reduction