微型电阻加热推进器内的传热问题  

Preliminary Analysis of Heat Transfer in Micro Water Resistojet

作　　者：吕晓辰[1] 姜培学[1] 任泽霈[1] 孙锡九[1] 

机构地区：[1]清华大学热能工程系,北京100084

出　　处：《计算物理》2004年第1期43-48,共6页Chinese Journal of Computational Physics

基　　金：国家重点基础研究发展规划项目(No.G1999033106);国家杰出青年基金(No.50025617)资助项目

摘　　要：　分析了微型电阻加热推进器中沸腾的特征以及过热极限温度,分别采用经典的抛物型热传导方程和非傅立叶导热的双曲型模型(C-V模型)、双元相滞后模型(DPL模型)来描述导热过程,采用有限差分法对微型电阻加热推进器中导热过程的初始阶段进行了数值求解.发现非傅立叶模型较傅立叶模型有一定的时间延迟,DPL模型与C-V模型的延迟差别不太大;在加热过程中,加热电阻及其临近的水很快会升至300℃,而大部分水的温度升得较慢.The characteristics of boiling and the superheat limit temperature in the micro water resistojet are analyzed. The beginning moment of heat transfer in micro-thrusters is described by the classical model of Fourier's law, the non-Fourier 'Cattaneo-Vernotte'(C-V) model and the non-Fourier 'dual phase lag'(DPL) model of heat conduction, respectively. The governing equations are numerically solved by using the finite difference method. The results show that there is a time delay between Fourier model and non-Fourier models. The heating resistor and a little amount of adjacent water reach the temperature of 300℃ quickly. However, most of the water is still in a comparatively low temperature.

关 键 词：微推进器 电阻加热 非傅立叶导热 数值模拟 沸腾 过热极限温度 传热学 

分 类 号：TK124[动力工程及工程热物理—工程热物理]