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为了准确高效地进行发动机冷却管道结构的热-力耦合数值分析,基于边界单元法提出一种冷却介质中结构对流换热过程的新型计算方法,计算过程中采用径向积分法将对流换热边界积分方程中的域积分转换为等效的边界积分,从而显著降低计算难度。采用改进后的边界单元法和有限元方法分别进行发动机燃烧室主动冷却管道处的热-力耦合分析,计算并获得了该处的温度场、位移场和应力场,发现了不同物理量随管道轴向的变化规律。通过比较基于两种不同数值方法的计算结果可以发现本文数值方法在显著降低计算模型复杂度的同时,取得了合理的计算结果。因此利用本文方法可以简便有效地进行发动机燃烧室主动冷却管道结构的热-力耦合分析。
In order to analyze the thermo-mechanical coupling of the cooling pipe structure accurately and efficiently, a new method of calculating the convection heat transfer in the cooling medium is proposed based on the boundary element method. The radial integration method is used to calculate the convection heat transfer boundary Domain integrals in integral equations are converted to equivalent boundary integrals, significantly reducing computational complexity. The improved boundary element method and finite element method are respectively used to analyze the thermo-mechanical coupling of the active cooling pipe in the combustion chamber of the engine. The temperature field, displacement field and stress field are calculated and obtained. It is found that the different physical quantities vary with the pipe axis To change the law. By comparing the results based on two different numerical methods, we find that the numerical method in this paper can reduce the complexity of the computational model significantly and obtain a reasonable calculation result. Therefore, the method proposed in this paper can be used to analyze the thermo-mechanical coupling of the active cooling duct structure in the engine combustion chamber simply and effectively.