Experimental investigation on noise suppression in supersonic jets from convergent-divergent nozzles with baffles

Yoshiaki Miyazato, Yong Hun Kweon, Toshiyuki Aoki, Mitsuharu Masuda, Kwon Hee Lee, Heuy Dong Kim, Toshiaki Setoguchi, Kazuyasu Matsuo

研究成果: ジャーナルへの寄稿記事


The acoustic properties of supersonic jet noise from a convergent-divergent nozzle with a baffle have been studied experimentally over the range of nozzle pressure ratios from 2.0 to 8.0. Acoustic measurements were conducted in a carefully designed anechoic room providing a free-field environment. A new approach for screech noise suppression by a cross-wire is proposed. Schlieren photographs were taken to visualize the shock wave patterns in the supersonic jet with and without the cross-wire. The effects of the baffle and the cross-wire on acoustic properties are discussed. It is shown that the baffle has little effect on the screech frequency for the underexpanded supersonic jet without the cross-wire. Also, the cross-wire introduced in supersonic jets is found to lead to a significant reduction in overall sound pressure level.

ジャーナルJournal of Thermal Science
出版物ステータス出版済み - 12 1 2003


All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics