汽车发动机冷却风扇气动性能研究和优化
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摘要
基于CFD模拟和试验的方法,研究汽车发动机冷却风扇结构参数对风扇气动性能的影响,优化确定了一款高效率的新风扇。对风扇进行了试验,建立了与试验风扇结构相同的模型并进行仿真计算,通过对比模拟和实验,验证了模型的正确性;在此基础上,分析调整结构参数对气动性能的影响,结果表明风扇叶片弦长和安装角较轮毂比对气动性能影响较大,优化后的风扇静压效率能达26. 48%,较原模型静压效率提高了5. 75%。
Based on computational fluid dynamics simulation analysis and experimental testing,the effects of structure and parameters of an automobile engine cooling fan on its aerodynamic performance were carried out. Through a number of simulation calculations,a new fan of high aerodynamic performance was obtained. The measurements of aerodynamic performances of the fan was conducted. Proe was applied to make the three-dimensional model of fan and flow channel and CFD technology and ANSYS software were used to simulate the original model of fan. Comparing the simulation results and experimental results,it was proved that CFD could predict the fan performance effectively. On the basis of the model,the influence of parameters of the fan on its aerodynamic performance was analyzed. Results showed that the effect of fan blade chord length and the installation angle on fan aerodynamic performances was bigger than that of the wheel hub. After the optimization,static pressure efficiency could reach 26. 48%,which increased 5. 75%.
Based on computational fluid dynamics simulation analysis and experimental testing,the effects of structure and parameters of an automobile engine cooling fan on its aerodynamic performance were carried out. Through a number of simulation calculations,a new fan of high aerodynamic performance was obtained. The measurements of aerodynamic performances of the fan was conducted. Proe was applied to make the three-dimensional model of fan and flow channel and CFD technology and ANSYS software were used to simulate the original model of fan. Comparing the simulation results and experimental results,it was proved that CFD could predict the fan performance effectively. On the basis of the model,the influence of parameters of the fan on its aerodynamic performance was analyzed. Results showed that the effect of fan blade chord length and the installation angle on fan aerodynamic performances was bigger than that of the wheel hub. After the optimization,static pressure efficiency could reach 26. 48%,which increased 5. 75%.
引文
[1]王福军.计算流体力学分析——CFD软件原理与应用[M].北京:清华大学出版社,2005.
[2]纪兵兵,陈金瓶. ANSYS ICEM CFD网格划分技术实例详解[M].北京:中国水利水电出版社,2012.
[3]庞磊,李孝宽,李嵩,等.对旋轴流通风机气动性能的数值预估[J].风机技术,2008(4):20-22.
[4]唐钊.发动机冷却风扇叶片参数的研究和优化[D].深圳:华南理工大学,2012.
[5]张永超,王维斌,陈庆光,等.对旋轴流风机三维流场的非定常数值模拟研究[J].流体机械,2009(11):19-23.
[6] CRAVERO C,SATTA A. A Navier-Stokes based strategy for the aerodynamic optimization of a turbine cascade using genetic algorithm[R]. ASME Turbo Expo.,2001-GT-0508.
[7]许名珞.基于流固耦合仿真的小型轴流风扇优化设计[J].现代机械,2015(1):6-10.
[8]王企鲲,叶舟,陈康民.微型轴流风扇扭叶片设计及其气动分析[J].上海理工大学学报,2007,29(3):268-274.
[9]席光,王志恒,王尚锦.叶轮机械气动优化设计中的近似模型方法及其应用[J].西安交通大学学报,2007,41(2):125-135.
[10] WILLIAMS J,KARANTH D,OLER W. Cooling inlet aerodynamic performance and system resistance[J]. SAE Technical Paper Series,2002(1):0256.
[2]纪兵兵,陈金瓶. ANSYS ICEM CFD网格划分技术实例详解[M].北京:中国水利水电出版社,2012.
[3]庞磊,李孝宽,李嵩,等.对旋轴流通风机气动性能的数值预估[J].风机技术,2008(4):20-22.
[4]唐钊.发动机冷却风扇叶片参数的研究和优化[D].深圳:华南理工大学,2012.
[5]张永超,王维斌,陈庆光,等.对旋轴流风机三维流场的非定常数值模拟研究[J].流体机械,2009(11):19-23.
[6] CRAVERO C,SATTA A. A Navier-Stokes based strategy for the aerodynamic optimization of a turbine cascade using genetic algorithm[R]. ASME Turbo Expo.,2001-GT-0508.
[7]许名珞.基于流固耦合仿真的小型轴流风扇优化设计[J].现代机械,2015(1):6-10.
[8]王企鲲,叶舟,陈康民.微型轴流风扇扭叶片设计及其气动分析[J].上海理工大学学报,2007,29(3):268-274.
[9]席光,王志恒,王尚锦.叶轮机械气动优化设计中的近似模型方法及其应用[J].西安交通大学学报,2007,41(2):125-135.
[10] WILLIAMS J,KARANTH D,OLER W. Cooling inlet aerodynamic performance and system resistance[J]. SAE Technical Paper Series,2002(1):0256.