空洞形消音器で発生する気流騒音特性と速度変動特性との相関

概要

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The correlations between fluctuating velocity and flow-generated noise in expansion chamber type silencers are investigated experimentally. The coherence characteristics vary with changing of flow pattern in the chamber section between both open ends of the inlet pipe and the tail pipe. Especially, for the silencer in which the distance (l) of such chamber section is less than four times pipe diameter (d), the excellent peak frequency in the fluctuating velocity spectrum corresponds to that of the flow noise spectrum. They, being caused by the direct impact of jet on the tail pipe edge in the chamber, vary with the ratio l/d and the mean flow velocity in the pipes. When the tail pipe is inserted into the chamber, the resonance component determined by the chamber length, which occurs close to the above mentioned peak frequency, becomes dominant and its higher order components appear repeatedly in the each spectrum.
東海大学の論文