内燃机活塞温度场的三维边界元分析及试验研究

Analysis on Piston Temperature Field of Diesel Engines by Use of 3-D Boundary Element Method and Experimental Investigation

边界元法是一种新的正在发展中的数值计算方法,其主要优点是仅需在物体表面离散网格,而且计算精度较高,并可广泛地应用于许多领域。本文从热传导方程出发,介绍了三维环界法的理论和数值计算方法,并在IBMPC/XT 微型计算机上开发了可解工程实际问题的三维边界元程序,同时对国产135系列柴油机活塞进行了分析计算及试验研究,结果表明,边界元法是一种有效的数值计算方法。

Boundary Element Method(BEM)is a new developing numericalcalculation method.The main advantages of BEM are that the methodrequires only discretization of the surface and the accuracy is rather high.It can be widely used in many fields.This paper introduces the theory of3-D BEM based on fundamental differential equation of heat conduction andnumerical calculation method.A 3-D BEM program that can be used tosolve practical engineering problems is designed on IBM PC/XT microcom-puter.At the end of the paper,the piston temperature field of 4135 dieselengine is calculated by BEM and experiments are made.The results indicatethat BEM is an effective numerical calculation method.