Abstract
This paper describes the experimental investigation on the acoustic absorption caused by interaction of sound waves with fine-scale jets through conical holes. The experiments were carried out on three types of perforated plate: one has the straight holes, another have semi-conical and conical. The experimental results showed that the absorption was enhanced by not only the fine-scale jets through the perforated plate but also the effect of cross sectional area of the holes. The fine-scale jets through the conical holes provided a better absorption coefficient over a wide frequency range.
