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对液体火箭发动机气液同轴式喷嘴声学特性进行了深入的实验研究，确定了不同缩进比的气液同轴式喷嘴工作时发生啸叫的参数范围、啸叫的频率和声压级分布，并考察了啸叫对喷嘴雾化特性的影响。结果表明；气液同轴式喷嘴的啸叫区间与喷嘴的结构尺寸有密切的关系．较大的喷嘴缩进比对啸叫有明显的抑制作用，啸叫的主要成分是高频噪声，这种喷嘴啸叫可能成为诱发发动机高频不稳定燃烧的重要因素。另外，实验还发现，在较低的气体喷注压降下，啸叫对喷嘴雾化有一定的强化作用。
The acoustic characteristics of the liquid-liquid coaxial nozzle of a liquid rocket engine were studied in depth. The parameter range of howling of gas-liquid coaxial nozzles with different indentation ratios was determined, and the frequency and sound pressure level distribution of howling , And investigated how the howling affects the atomization characteristics of the nozzle. The results show that the gas-liquid coaxial nozzle howling range and nozzle structure size are closely related. Larger nozzle indentation than the whistle significantly inhibited, whistling is the main component of high-frequency noise, this nozzle whistling may be induced by high frequency instability engine combustion is an important factor. In addition, the experiment also found that in the lower pressure drop of gas injection, howling on the nozzle atomization has a certain degree of strengthening effect.