电热式热交换器的数值分析

NUMERICAL ANALYSIS OF ELECTRIC HEAT EXCHANGER

对工质加热以提高其比冲,是电火箭应用中的一个技术问题。本文对圆环形通道的内加热流动问题进行了研究。应用Patanka-Spardlinq方法,求解了抛物型的N-S方程,并考虑了外壁面的散热损失。对不同氨分解率和膨胀比的多种情况进行了计算,并对热功率和管道长度的选择进行了分析。

For the improvement of the specific impulsion in electric rocket, the heating of actuating medium with elctric power is a practical method. In this paper, the flow in a annular passage is investigated. The Patankar-Spalding method is used to solve the parabolic Navier-Stokes equations and the heat losses at the outer wall is considered.Calculations are performed for various ammonia decomposition rates and various nozzle expand ratio, and the selection of heat power and passage length are investigated also.