液氧煤油气液同轴直流离心式喷嘴的声学模拟实验研究

气液同轴直流离心式喷嘴对补燃发动机燃烧室高频燃烧稳定性有显著影响。为研究气液同轴直流离心式喷嘴的声学特性,在大气环境条件下进行了单喷嘴声学模拟实验。通过安装在模拟燃烧室外侧的扬声器激发声学振荡,利用声学探针测量燃烧室内的声压,获得了喷嘴长度、节流嘴直径对燃烧室声学特性的影响规律,确定了喷嘴长度与节流嘴直径的选取原则。

Acoustic modeling experimental investigation of the LOX/kerosene gas-liquid coaxial orifice-swirl injector

The bipropellant gas-liquid coaxial orifice-swirl injector has great effects on the high-frequency combustion instability of the LOX/kerosene staged combustion cycled engine. For investigation the acoustic characteristics of the injector, acoustic modeling test at 1 atm was conducted. The vibration was excited by the loudhailer fixed on the outer of the modeling combustion chamber, and the pressure surge of the combustion chamber was measured by the acoustic probe. The disciplinarian that the configuration parameter, such as the channel length of the injector and the diameter of the throttle affecting on the acoustic characteristics was obtained, and the selection principle of the channel length and the diameter of the throttle was also established.