The Application Of CFD To Evaluation And Improvement In YC6T Diesel Intake Port

The structure of intake port directly affects the quantity of fresh air and the strength of swirl in cylinder and it can be related with forming mixture air and oil, combustion, exhaust and total performance of diesel engine. But the method of three-dimensional numerical simulation can offer the integration evaluating parameters of the intake port and can show the microcosmic information of the inner flow field. So this method can supply the optimization design and improvement for the intake port of diesel engine.In this dissertation, the development and research of diesel intake port is summarized and the mathematical models and numerical method are selected for three-dimensional numerical simulation.establishes the three-dimensional geometric model of the YC6T helical intake port and uses the results of steady flow test rig as boundary conditions;makes three-dimensional numerical simulations in CFD software AVL-FIRE,validates the calculational results via the Ricardo and FEV evaluation acquired through test rig,and draws a conclusion that the two have a basicly accordant trend,which shows the feasibility of applying CFD to evaluation in diesel intake port; provides detailed flow field information of the port,on the basis of which make a proposal of port improvement;after the modification of the intake port following the proposal,simulates the intake port three-dimensionally again,which shows the validity of applying CFD to improve diesel intake port.The author applies the flow field results to guide the port modification and achieves the purpose of taking effect quickly and lowering cost during development.