发动机燃烧室主动冷却管道的热-力耦合分析

Analysis for Thermal and Mechanical Coupling in Active Cooling Channels for Engine Combustor

关键词:  边界单元法  径向积分法  发动机燃烧室  主动冷却管道  热-力耦合分析 

Key words:  Boundary element method  Radial integration method  Engine combustor  Active cooling channel  Thermal and mechanical coupling analysis

摘要:

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。 

Abstract:

With the purpose to predict the thermal and mechanical coupling onalysis in active cooling channels for the engine accurately and effectively, a novel numerical method for the analysis of structure heat convection process in cooling medium was proposed based on boundary element method. In order to decrease the computational complexity significantly, the radial integration method was employed to transform the domain integrals of heat convection integral equation to equivalent boundary-only discretization. The proposed boundary element method and finite element method were both taken to obtain thermal and mechanical coupling analysis results including temperature, displacement and stress fields in the cooling channel system of engine combustion. The variation characteristic of different parameters along the channel axis was investigated. From the comparison between the results, it can be found that the numerical method proposed obtains reliable computational results.Moreover,it decreases the computational complexity significantly.Thus the present method can be employed to give thermal and mechanical coupling analysis in active cooling channels for the engine combustor effectively and conveniently. 