燃烧室室壁冲击／气膜复合冷却壁温分布研究（二）理论部分

STUDIES ON THE DISTRIBUTION OF WALL TEMPERATURE OF IMPINGEMENT AND FILM COOLING OF COMBUSTION CHAMBERS(2)THEORETICALLY

关键词:  燃气轮机  燃烧室  壁温  空气冷却

Key words:  Gas trubine  Combustion chamber  Wall temperature  Air cooling

摘要:

在考虑轴向导热的基础上，结合壁温分布实验数据，用纯气膜及冲击换热的研究成果，发展了计算纯气膜、夹层气膜及冲击／气膜复合冷却火焰筒一维壁温分布计算程序，计算结果与实验结果二者基本吻合。研究表明，在冲击／气膜复合冷却计算中，应充分考虑Ｃｍ的值随Ｇｃ增大而增大的情况；且冲击／气膜冷却计算中的Ｃｍ取值高于纯气膜及夹层气膜冷却计算的Ｃｍ取值。本程序可用于纯气膜、夹层气膜及冲击／气膜复合冷却火焰筒一维壁温分布的初步分析中。

Abstract:

A study has been conducted with the axial heat conduction considered. Based on the experimental data of wall temperature distribution and the research findings of the pure film and impingement heat transfer, a program fo f thecalculation of channel film and impingement/film cooling was developed. The calculated results are in agreement with the experimental data. It is shown that the valueof Cm increases with that of Gm, which requires careful consideration, and the value of Cm for the calculation of impingement/film cooling is higher than the calculatedvalue of pure film and channel film. The program can be applied in the preliminaryanalysis of the one-dimensional wall temperature of the pure film, channel film andimpingement/film cooling.