202 高速脈動流れに関する数値解析および実験的研究

概要

論文の詳細を見る
The detail of pulsating flow typically seen in the exhaust system of four-cycle internal combustion engine was both experimentally and numerically simulated and investigated. It is extensively known that, as the result of non-linearity of compression wave propagating through the exhaust pipe, it leads to shock wave generation. Therefore, in the present study a special attention was paid in order to make the relationship of the flow field with the noise generation clear. In particular, the experiment was conducted under various conditions, with respect to the speed of engine. It became evident that characteristic of the flow field was strongly dependent on behavior of the compression wave generated by opening of exhaust valve. The change in gradient of the compression wave, especially, has great influence on the change in the flow field when the pulsating flow through the exhaust pipe discharges from the pipe end. This paper describes how and where the noise sources appear and the detail of pulsating flow associated with speed of engine.
一般社団法人日本機械学会の論文
2002-10-05