Sound Reduction by Splitter in a Curved Duct

Abstract

The sound characteristics of the transmitted waves through the curved duct with a splitter have been studied for various lengths and locations of the splitter in addition to the effect of mean flow in the duct. A finite difference method for a linearized Euler equation is performed to obtain the sound pressure level (SPL) and time-averaged intensity together with acoustic energy flux vector and time history of sound pressure. The present study shows that the level of the transmitted waves can be reduced remarkably at a particular length to yield the great insertion loss, however the variation of the splitter location has little effect on the insertion loss. The present result also shows that the instantaneous acoustic energy flux vector make clear the characteristics of the sound field, compared with the time-average intensity.