Silencing aerodynamic frame noises is an essential technology for developing and producing comfortable high-velocity vehicles. High-velocity vehicles have small or large grooves on their surface and these grooves radiate aerodynamic tones. One of main components of aerodynamic noise from high-velocity vehicles are tones generated by flows over grooves on the body surface. In this study we have been experimentally investigating characteristics of an aerodynamic sound-source generated from thecrossflow over two-dimensional groove as a shallow cavity by using the low noise acoustic wind tunnel. Characteristics of radiated noise, pressure fluctuations on the rear-edge surface of the groove and velocity turbulences around the groove have beenmeasured and analyzed.
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