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对某1.4L增压汽油发动机排气歧管进行了计算流体动力学(CFD)优化设计研究。首先采用基于有限元法的CFD求解器AcuSolve对初始排气歧管模型进行了流场分析,根据流场特征确定排气歧管外形需要重点优化设计的两个区域。然后对区域外形进行了模型参数化,创建了2个形状变量。最后调用全局响应面法以减小压降为目标进行排气歧管CFD优化,优化收敛后新设计排气歧管压降减小4.35%。研究方法对于排气歧管CFD优化设计具有一定的工程应用价值。
CFD optimization design of a 1.4L turbocharged gasoline engine exhaust manifold was carried out. First, CFD solver AcuSolve based on the finite element method was used to analyze the flow field in the initial exhaust manifold model. Two regions which need to be optimized in design were selected according to the characteristics of the flow field. Then, the area profile was modeled and two shape variables were created. Finally, global response surface method was used to optimize the CFD of the exhaust manifold to reduce the pressure drop. After optimization, the pressure drop of the newly designed exhaust manifold was reduced by 4.35%. The research method has certain engineering application value for CFD optimization design of exhaust manifold.