基于非线性分析的发动机热流场数值仿真方法研究

Heat Flow Field Numerical Simulation Method of Engine Based on Nonlinear Analysis

为了提高发动机热流场的量化分析能力,提出基于非线性分析的发动机热流场数值仿真方法。构建发动机热流场的流体力学参数分析模型,结合发动机热流的流体力学参数分析和屈服参数分析,建立发动机热流场的双重应力分析模型,通过非线性力学分析方法,确定发动机热流场数值仿真的流体约束参数特征集,结合发动机热流场的应力-应变关系式,构建发动机热流的相流体压力控制对象模型,采用有效应力特征参数重构和双重热流饱和参数估计方法,实现对发动机热流场数值仿真和参数估计。测试结果表明,该方法获得的发动机热流场数值仿真准确率始终在97.5%以上,仿真耗时始终低于0.4 s,实际应用效果更好。

In order to improve the quantitative analysis of the heat flow field in engine,a numerical simulation method of heat flow field based on nonlinear analysis is proposed.Firstly,the hydrodynamic parameter analysis model of the engine heat flow field was constructed,and then by combing the hydrodynamic parameter analysis of the engine heat flow and the yield parameter analysis,the dual stress analysis model of the engine heat flow field was established.Finally,combined the determined fluid constraint parameter feature set of the engine with the nonlinear mechanical analysis method with the stress-strain relationship of the engine heat flow field,the phase fluid pressure control object model of the heat flow in the engine was created to realize the numerical simulation and parameter estimation of heat flow field in the engine by the effective stress characteristic parameter reconstruction and double heat flow saturation parameter estimation method.The test results show that the accuracy of numerical simulation of heat flow field is always above 97.5%,and the simulation time is always less than 0.4 s,and the numerical simulation method has better practical application.