REDUCTION OF IMPULSIVE NOISE CAUSED BY UNSTEADY COMPRESSION WAVE

When an unsteady compression wave propagating in a tube arrives at its exit, an impulsive wave is emitted toward the surrounding, which caus es an impulsive noise. The objective of this work is to investigate th e appropriate silencer configuration for reducing this impulsive noise . Five kinds of silencers were installed at a shock tube exit, and the ir effects on the impulsive noise were investigated numerically and ex perimentally. Two-dimensional unsteady conservation equations were sol ved by means of a PLM. Experiments were carried out using a shock tube with an open end. As a result, the effect of silencer configuration o n noise reduction was clarified, and it was found that a suitable choi ce of the silencer could reduce the strength of the impulsive wave by about 25%.