122 微小噴流と干渉する音波の吸音特性(空力騒音の抑制)

Abstract

This paper describes the experimental investigation on the acoustic absorption caused by interaction of sound waves with fine-scale jets. The authors carried out the experiments on two types of perforated plates: one has the straight channel, the other the tapered. The experimental results showed that the absorption was enhanced by the fine-scale jets through the perforated plate, compared with the non-flow case. The fine-scale jets through the tapered channel provided a better absorption coefficient over a wide frequency range.