차량용 머플러 테일파이프 내부 유동특성에 따른 실험적 연구

Abstract

As an interest regarding indoor chastity anger increases greatly nowadays in case of high-speed driving as basic design concept to be applied to all products the comfort result, with a lot of effort to floating interpretation demand and development inner an exhaust total. The case that the floating noise by disturbances of fluid occurs in case of high speed driving in case of mufflers used to a large sedan when the amount of flowing water of large quantity flows in the muffler inside exists. A case of the floating noise can return in triumph through detailed consideration regarding a floating chapter. The exhaust noise contribution is the only under a high main noise circle to the external radiation noise and the noise inner a cockpit. Data regarding a muffler design will provide flow resistance improvement and noise reduction of the pipe which is an edge as I analyze contents I acquire data, and to have been related to a CFD technique grown up than the existing ways to the general characteristic and noise regarding corpse fluid regarding to use in study. As a result of I changed the angle that I set up a diameter of a harm conduit line with 45mm and 60mm, and I bent of an each conduit line for finding out a floating characteristic of Tail-pipe to 70 °, 50 °, 30 °, and having considered floating characteristic and noise analysis through numerical interpretation, I got the following conclusion. (1) The occurrence of slip by corpse viscosity and eddy appeared actively in sharp formal changes at 70 ° when I tried to confirm a speed vector to occur according to the angles that I changed of a conduit line. (2) Sound pressure occurred, but did not it at 50 ° in the latter parts so that the phenomenon that a corpse flowed backward was conspicuous. (3) It was with a form to have given the angle that I bent of 50 ° that the noise occurred lowest according to the angles that trend anger of a noise occurrence degree appeared equally by the interpretation results of the noise to occur according to the angles that I changed of a conduit line about time, all case to have done confirmation, and I bent, and there was confirmation. (4) I showed by the best results when I gave the angle that I tried to delay a floating characteristic along a form change of Tail pipe by the interpretation results of a speed and pressure and the noise according to purposes when comparison tried, and I bent of 50 ° in this study.