组合发动机空气预冷换热器动态特性的数值分析

基于守恒原理，导出叉流管－管型换热器非稳态传热过程的数学模型及相应的离散方程。利用隐式格式，求得组合发动机空气预冷换热器随时间而变的出口及壁面温度。指出此类动态计算若采用显式格式是极其费时的。对比解析解及显式方法的计算结果，表明隐式方法的解是有效可信的。所编计算机程序可用于发动机系统调式。

NUMERICAL ANALYSIS OF DYNAMIC CHARACTERISTICS OF AIR-PRECOOLED HEAT EXCHANGER FOR COMPOUND ENGINE

Based on the conservation laws mathematical model and corresponding discritization equations of transient heat trunsfer process in a crossflow tube tube heat exchanger are presented By use of implicit scheme,exit and wall temperature varying with time in air precooled heat exchanger for compound engine are extracted It is pointed out that this kind of dynamic calculation is very spending time if explicit scheme is used As compared with results of analytical solution and explicit method,it has been proved that the solution of implicit method is effective and feasible The compiled computer program can be used in debugment of engine system