涡喷发动机燃烧室内声测量技术研究

本文论述了测量分析燃烧噪声的目的和意义，它是进行燃烧室声疲劳研究及燃烧稳定性主动控制的基础。文中介绍了将声波导管插入燃烧室高温区和采用氮气吹洗冷却的测量系统，并对声导管的截止频率、半无限管的作用以及传热进行了分析讨论。最后论述了运用复数倒源信号恢复的技术来修正声导管测得的数据，还引用验作者实结果说明了这一方法的有效性。

A Study on High-Temperature Acoustic Measurement Within the Turbojet Combustors

The purpose and significance of measuring and analyzing combustion noise, which is the prerequiste for studying acoustic fatigue problems of engine combustors and active control of combustion stabilities,was presented in this paper. The measuring system that consistes of the sound wave guide tube inserted into the combustor and purged by cooling nitrogen was introduced associated with the discussion of its cut - off frequencies,the selection of half - infinite tube as well as the heat transfer problems. Finally, the techniques of source signal recovery employing windowed complex cepstrum used to modify the measured data of the sound propagation tube was discussed and the validation of this approach was proved by using the results from author's experiments.