污染空气对超音速燃烧地面试验结果的影响

EFFECTS OF VITIATED AIR ON THE RESULTS OF GROUND TESTS OF SCRAMJET COMBUSTOR

关键词:  超音速燃烧  地面试验  研究

Key words:  Supersonic combustion  Ground test. Research

摘要:

文中阐述了超燃冲压模型燃烧室地面试验时,进口空气污染的影响。从超燃燃烧室内的自动着火,燃烧过程机理来分析污染物（H₂O）的作用。用电弧加热进口气流及向气流喷水模拟氢加热器加热。结果表明:如果使用氢加热器直接加热空气,进口空气中含有污染物,它对超音速燃烧室地面试验的影响,将取决于进口气流状态,喷射方式、污染物含量和氢当量比等,是模拟试验中必须予以考虑的问题。

Abstract:

This paper investigated the effects of vitiated inlet air on the results of ground test of scramjet combustor, and analysed the role of air contaminator (H2O) in combustion processes on the basis of automatic ignition and combustion mechanism. The test was carried out by using electric arc-heated inlet air and injecting water into the airstream to simulate ahydrogen-heator. It has been found that, when inlet air is heated by a hy-drogen-heator, the influence of air contaminator (H2O) on ground tests re-suits depends on inlet air status, injection ways, amount of vitiated species, and hydrogen-air equivalence ratio, etc., and this must be considered in model tests.