摘要
In many engineering practices, frequently an impulsive wave is a consequence of discharge of a shockwave from the exit of a tube, leading to an annoying noise like a sonic boom. The impulsive noisehas often been a major factor to limit the performance of flow devices as well as to affect hazardousinfluences on human being. The current paper describes a new control method for the reduction ofimpulsive wave. An experiment using a simple shock tube was carried out to examine the effect of acavity/helical vane system on the impulsive wave strength. The resulting impulsive wave was influencedby the detailed configuration of the belieal vane inside the cavity which is located at the vicinity ofthe exit of a tube. The effect of the belieal vane was compared with no belieal vane tests to ensurevalidation of this kind of control strategy. The results showed that the strength of the impulsive wavecould be significantly reduced by the current passive control using the cavity/helical vane system.
