Моделювання потоків відпрацьованих газів в автомобільних глушниках

Abstract

Розроблено комп’ютерну модель для імітаційного дослідження потоків відпрацьованих газів в автомобільних глушниках, що дозволяє визначити їх протитиск та якісно оцінити акустичну ефективність, а також нову конструкцію автомобільного глушника. Наведено результати імітаційних досліджень.

Exhaust silencers play an important role in reducing noise in big cities. The design of exhaust silencers is a difficult task, because it requires a compromise between acoustic efficiency and backpressure. The development of computer technology allows to facilitate the solution of many technical problems. Computer simulation makes it possible to specify more complex conditions, to save computation time and to obtain the results in a convenient form for analysis. The author has built a computer model of the flow of gases in exhaust silencer. In the model the backpressure of exhaust silencer is determined and graphs of the speed change of gas flow are built. The analysis of changes in gas velocity allows to evaluate acoustic performance of exhaust silencer. Thanks to constructed model it is possible to determine that tangential holes and perforated conical tube provide good acoustic efficiency in the design of exhaust silencers. Such decisions have been used by the author in creating the new exhaust silencer. The offered exhaust silencer has a high acoustic efficiency, low backpressure and low weight.