Low-noise Optimization Design for Commercial Vehicle Cooling system

Lu Zengjun1, Tang Rongjiang1,2, Chen Zhisong1, Feng Zhe1, Zhang Cheng2

Automobile Technology - - 汽车技术 -

1. Dongfeng Liuzhou Automobile Co., Ltd., Liuzhou 545005; 2. Guilin University of Electronic Technology, Guilin 541500) (

In order to lower the high noise inside cab of a heavy duty commercial vehicle under conditions of high【Abstract】temperature and high speed, sound source recognition and heat balance test were conducted with frequency spectrum analysis method, the cooling fan wideband eddy noise was identified as the main noise source, and it was concluded according to fan performance curve and vehicle heat balance test data that eddy was the main cause of high system resistance and degraded heat dispersion. CFD analysis method was utilized to make numerical analysis of engine compartment flow field, and it was concluded that overlength fan cowl edge caused airflow exported from fan which generated eddy current group, a fan cowl optimization design was thus proposed. Test results show that the optimized fan cowl reduces airflow eddy exported from fan, and air intake by the radiator is increased from 3.12kg/s to 3.68kg/s, and cab noise is reduced by 1.7dB (A).

Key words: Cooling system, CFD simulation, Heat dispersion, Low noise optimization

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