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Large eddy simulation and proper orthogonal decomposition analysis of turbulent flows in a direct injection spark ignition engine:Cyclic variation and effect of valve lift

查看全文 作　　者：QIN [1]WenJin;XIE [1]MaoZhao;JIA [1]Ming;WANG [2]TianYou;LIU [2]DaMing 高影响力作者 机构地区：[1]School of Energy and Power Engineering, Dalian University of Technology;[2]State Key Laboratory of Engines, Tianjin University高影响力机构 出　　处：《Science China(Technological Sciences)》索引2014年第57卷第3期,共16页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51176020 and 51376029) 摘　　要：Large eddy simulation(LES)is used to calculate the in-cylinder turbulent flow field in a direct injection spark ignition(DISI)engine.The computations are carried out for three different maximum valve lifts(MVL)and throughout 100 consecutive engine cycles.The simulated results as well as corresponding particle image velocimetry(PIV)measurement database are analyzed by the proper orthogonal decomposition(POD)method.Through a new developed POD quadruple decomposition the instantaneous in-cylinder flow fields are decomposed into four parts,named mean field,coherent field,transition field and turbulent field,respectively.Then the in-cylinder turbulent flow characteristics and cycle-to-cycle variations(CCV)are studied separately upon the four part flow fields.Results indicate that each part exhibits its specific characteristics and has close connection with others.The mean part contains more than 50%of the total kinetic energy and the energy cascade phenomenon occurs among the four part fields;the coherent field part possesses the highest CCV level which dominates CCV of the bulk flow.In addition,it is observed that a change in MVL affects significantly the in-cylinder flow behavior including CCV,especially for the coherent part.Furthermore,the POD analysis demonstrates that at least 25 sample cycles for the mean velocity and 50 sample cycles for the RMS velocity are necessary for obtaining converged and correct results in CCV. 关 键 词：火花点火发动机 正交分解 大涡模拟 湍流流场 气门升程 直接喷射 循环 缸内流场
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