重型载货汽车高流量低噪声冷却风扇研究

Research on High Flow Rate & Low Noise Cooling Fan of Heavy Duty Truck

运用商业软件FLUENT,基于N-S方程和标准k-ε湍流模型的CFD技术,采用SIMPLE算法,对冷却风扇进行了流场仿真计算和气动噪声数值预估。仿真结果与试验结果吻合较好,验证了流场仿真算法的可靠性。研究不同翼型截面得到了改进风扇模型。计算结果表明,改进方案1的质量流量比原型风扇提高了4.4%～4.8%,噪声降低了2.4～4.6dB(A);改进方案2的质量流量提高了7.8%～9.2%,噪声降低了0.5～1.7dB(A)。

How field emulation computation and aerodynamic noise value pre-estimation of cooling fan are carried out with CFD technique based on N-S equation and standard k-s turbulence model and SIMPLE algorithm in commercial software FLUENT.The emulation results and test results are approximately identical,therefore verifying the authenticity of flow field emulation algorithm.An improved fan model is obtained by studying different aerofoil sections.The computation results show that compared with the previous fan,the mass flow of the modified plan 1 increases by 4.4 % to 4.8 %,whereas noise drops by 2.4 to 4.6 dB （A） ;the mass flow of the modified plan 2 increases by 7.8 % to 9.2 %,noise drops by 0.5 to 1.7 dB（A）.