基于本征正交分解法的缸内流场循环变动特性分析  

Analysis of Cyclic Variation Characteristics of Flow Field in Cylinder Based on Proper Or-thogonal Decomposition Method

作　　者：秦文瑾 严俊 王家富 景瑞雄 

机构地区：[1]上海理工大学机械工程学院,上海

出　　处：《建模与仿真》2023年第1期261-271,共11页Modeling and Simulation

摘　　要：应用本征正交分解(POD)方法对数值模拟的发动机多循环速度场数据进行分析,以深入考察发动机缸内速度场循环变动特性。结果表明,POD方法可以将速度场分为不同阶模态,能反映不同程度的流场结构。分析了不同模态对应的时间系数标准差随曲轴转角的变化情况,揭示了缸内速度场循环变动大小随发动机曲轴转角的变化的规律,即进气阶段速度场循环变动要大于压缩阶段速度场循环变动。The Proper orthogonal decomposition (POD) method was used to analyze the numerical simulation of engine multi-cycle speed field data to deeply investigate the cyclic variation characteristics of the engine velocity field. The results show that the POD method divides the velocity field into different order modes, reflecting different degrees of flow field structure. The change of the standard devia-tion of the time coefficient corresponding to different modes with the crankshaft angle was analyzed, and the law of the change of the cyclic change of the velocity field in the cylinder with the rotation angle of the engine crankshaft was revealed, that is, the cyclic variation of the velocity field in the intake stage was greater than that of the velocity field in the compression stage.

关 键 词：循环变动 缸内流场 本征正交分解法 曲轴转角 循环速度 时间系数 进气 流场结构 

分 类 号：TK4[动力工程及工程热物理—动力机械及工程]