Host: The Japan Society of Mechanical Engineers
Name : Dynamics and Design Conference 2023
Date : August 28, 2023 - August 31, 2023
The present paper focuses on the behavior of vortex shedding in in-line tube banks before and after the occurrence of acoustic resonance. We have studied the characteristics of acoustic resonance generated by in-line tube banks with a tube pitch ratio of 2.8 in the flow direction. The single high peak was formed in the sound pressure level spectrum at the gap velocity of 5 ~ 48 m/s. As the gap velocity increased, the peak frequency increased. The Strouhal number became about 0.145. At the gap velocity of 23 m/s, the acoustic resonance of the first mode occurred in the transverse direction. The vortex flow field in the tube banks was measured by PIV before and after the occurrence of the acoustic resonance phenomenon. The alternative vortices were shed from each tube in tube banks before and after occurrence of acoustic resonance. A pair of vortices was generated on the upper and lower sides of the jet stream flowing between the gaps of two tubes. On the other hand, the phase aligned alternative vortices were shed from each tube in tube banks occasionally. We discussed the effect of acoustic resonance on the vortex flow field in the tube banks.
