基于小孔喷注理论的复合式小孔消声器设计

Design of Compound Small-hole Muffler Based on Small-hole Injection Theory

目的降低某型飞机ECS系统空气散热器性能试验台管路产生的高温高速排气噪声。方法依据小孔喷注控制噪声理论,设计由4层穿孔板吸声结构组成的复合式小孔消声器。结果经试验测定,噪声声压级降低了35 dB(A)。结论设计的消声器消除了由临界孔板产生的刺耳的高频阻塞噪声,降低了噪声总声压级。降噪效果明显,可为类似管路气流噪声的消声设计提供参考。

The paper aims to reduce the high-temperature and high-speed exhaust noise generated by the air radiator per- formance test bench pipeline in the ECS system for a certain type of aircraft. According to the theory of small-hole injection control noise, a composite small-hole muffler composed of a 4-layer perforated sound absorption structure was designed. Through experimental measurement, the noise sound pressure was reduced by 35 dB(A). This design of muffler eliminates the high-frequency blocking noise generated by the critical orifice plate and reduces the total sound pressure level of the noise. It has significant effect of noise reduction and can provide a reference for reduction of airflow noise in similar pipelines.