引擎進氣與排氣系統之三維線性聲學計算

Linear Acoustics Computations of Engine Intake and Exhaust Systems

王憲樟(S.-C. Wang) ； 龔松長(S.-C. Kong) ； 秦雅嫺(Y.-S. Chin) ； 魏瑞昌(R.-C. Wei) ； 羅浩(H. Luo)

《中華民國振動與噪音工程學會論文集》 1996 (1996/04) Pp. 71-82

https://doi.org/10.30028/CSSVANNUAL.199604.0071

摘要

本研究探討汽車引擎進氣系統及機車引擎排氣系統管路內之聲學性質，利用三維線性聲學之理論，計算流場中聲波之擾動壓力分佈、特徵頻率及特定兩截面間之頻率響應函數。結果顯示汽車引擎進氣系統中之空氣濾清器有顯著的消音效果，而不同的進氣閥門之開啓所造成的頻率響應亦有顯著不同，進氣道前端的進氣閥門之開啓在較高的頻率下有較佳的頻率響應函數。本研究亦發現，機車引擎消音器內隔板及膨脹室之增加會導致非常不同的聲波分佈，有助於消音，但過度複雜的構造卻可能會使排氣管內的背壓升高而使引擎馬力劣化。

關鍵字

消音器 ； 線性聲學

並列摘要

This study presents the computational results of both automobile intake systems and motorcycle mufflers using the three-dimensional linear acoustics. The results of intake systems show the air cleaner has significant effects on noise reduction. In addition, the acoustic effects are different for different valve openings. Results of motorcycle mufflers show the muffler geometry has important effects on the sound wave properties inside the structure. As the complexity of muffler increases, noise reduction increases, but the exhaust back pressure also increase that could deteriorate the power output.