富燃燃气发生器在流量扰动下的压力响应特性

摘要

The pressure response characteristics of different monitor point under varying disturbance frequency are analyzed, by exciting high frequency sound wave in fuel-rich preburner. The research shows the additional flow disturbance does not change main pressure frequency distribution when the gas generator works in the design status, but the amplitudesof main frequency increase. The annulus baffle of gas generator not only separates the pre-mix chamber and combustion chamber, but also obstruct longitudinal pressure wave from pre-mix chamber spreading to combustion chamber, and damping effect is bigger for high frequency pressure wave. It should be independently to analyzes the pressure response characteristics, because the acoustic properties of pre-mix chamber are different from combustion chamber.%以某型富燃燃气发生器为研究对象,通过主动诱导方式在燃气发生器内部激发高频声波,分析燃气发生器中不同监测点位置在不同诱导频率下的压力响应特性.结果表明:流量扰动的加入并没改变燃气发生器在设计工作状态下的压力主频分布,但主频幅值会因扰动的加入而增大;燃气发生器中的扰流环将预混室与燃烧室隔离开,阻碍了纵向压力波向燃烧室的传播,且对高频压力波的阻尼作用更大;预混室与燃烧室有不同的声学特性,应独立分析预混室与燃烧室的压力响应特性.