基于流场动力学行为的机械产品结构性能研究

对以发动机为例的典型复杂机械内流场的特性进行分析，考察流场中的流形，研究其产品结构改进及性能改善的方法。采用数值方法，通过建立数学模型采用显隐相结合的时间差分和有限体积法进行离散，运用任意拉格朗日－欧拉（ＡＬＥ）法，对扩散项、对流项进行计算。根据模拟结果对发动机进行结构改进设计，结果表明：内流场的流形得到改进，总体性能得到改善，三维瞬态数值模拟是复杂机械产品设计过程中结构改进及性能改善的一种有效而实用的方法。

RESEARCH OF STRUCTURE AND PERFORMANCE BASED FLOW FIELD DYNAMIC BEHAVIOR IN MACHINE PRODUCT

The inner flow field characteristic of the Model K100 autocycle engine is analyzed. The flow pattern of flow field is investigated. A method of structure improve and performance amelioration is studied in complex machine product. The three-dimensional numerical simulation model is constructed in engine inner flow field for transient flow calculation. The method of time difference and finite volume to conjugate explicitness and implicitness is adopted to disperse the equations. The terms of diffuse and pressure and convection are calculated. According to the simulation results, modified scheme of engine structure is put forward. The calculation results show that expectation streamline pattern is improved in the inner flow field of engine and its general performance is ameliorated. Three-dimensional transient numerical simulation is a credibility and application technique to treat structure improve and performance amelioration of some complex machine product.