1111 噴流拡散装置の低騒音化に対する基礎的研究

抄録

A muffler is attached to the exhaust duct of a diesel engine, and aerodynamic noise is generated by exhaust gas flows into the muffler. The jet flow diffusion device diffuses an air flow inside muffler. An air flow flowing into the jet flow diffusion device flow out outside through the perforated metal and slits. In this study, we performed measurements of the aerodynamic noise changing by perforated metal, the cone position and an attachment position of the support. Then, in order to clarify the aerodynamic noise sources, we performed measurements of the velocity fluctuation of the flow of air flowing out of the jet flow diffusion device. The result of the aerodynamic noise measurement experiment shows that the SPL increases when cone position is on the upstream side.