内插管扩张室消声器的试验研究及其在航空发动机试车台上的应用

试车台排气噪声强，达标治理难度大，把研制的内插管扩张室消声器应用到试车台排气塔上，具有降噪效果显，性能稳定，流阻小，耐温性好，不产生二次污染和造价低的优点。现已建成8座内插管扩张室消声装置，其中A109排气塔顶最高噪声级为77dB(A)，总的降噪能力在70dB以上，为国内大型发动机试车台的消声工程全面达到工业噪声控制和环保标准提供了实例。

Experimental Study of Expand Chamber Type Silencer with Built in Tubes and Application in Aero-engine Test Facilities

It is a big challenge to completely control the noise generated from the exhaust system of aero engine test facilities. An expand chamber type silencer with built in tubes has been developed and widely applied. Total 8 sets of such silencers have been established. Having reduced by 70 dB, the noise level of only 77 dB was measured at the top of the exhaust tower equipped with the silencer under maximum engine operation condition. This type of silencer provides an operative technical approach to achieve the standards of industry noise control and environment protection for large-scale engine test bench. Obviously, this type of silencer is in possession of not only low cost but also high performances of effective noise reduction, low airflow pressure loss, perfect heatproof, and no second pollution.