有流船用排气消声器声学性能分析

Analysis of Acoustic Characteristics of Marine Exhaust Silencers with Air-Flow

用发展的双倒易边界元法考察了气流对双级膨胀腔消声器消声性能的影响,结果表明较高马赫数亚音速流的影响不可忽略。同时总结了内插管数量,进口位置和导流环结构对消声器传递损失的影响规律,具有一定的实用价值。

Influence of air flow on sound elimination effect of silencers with double expansion chamber is analyzed by means of the dual reciprocity boundary element method （DRBEM）. The results show that the influence of higher Mach number subsonic flow on the sound elimination of complex silencers can not be ignored. Affects of the number of inter-connecting tubes, inlet positions and the structural type of diversion annuluses on acoustic transmission loss of the silencers are summarized. Such conclusions are of some practical value for engineering application.