An experimental investigation of flow-induced acoustic resonance and flow field in a closed side branch system using a high time-resolved PIV technique |
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Authors: | Yan Rong Li Satoshi Someya and Koji Okamoto |
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Institution: | (1) Department of Human and Engineered Environmental Studies, Graduate School of Frontier Sciences, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8563, Japan;(2) National Institute of AIST, 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, Japan; |
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Abstract: | Abstract Systems with closed side branches are liable to an excitation of sound known as cavity tone. It may occur in pipe branches
leading to safety valves or to boiler relief valves. The outbreak mechanism of the cavity tone has been ascertained by phase-averaged
pressure measurements in previous research, while the relation between sound propagation and the flow field is still unclear
due to the difficulty of detecting the instantaneous velocity field. It is possible to detect the two-dimensional instantaneous
velocity field using high time-resolved particle image velocimetry (PIV). In this study, flow-induced acoustic resonance in
a piping system containing closed side branches was investigated experimentally. A high time-resolved PIV technique was used
to measure the gas flow in a cavity. Airflow containing oil mist as tracer particles was measured using a high-frequency pulse
laser and a high-speed camera. The present investigation on the coaxial closed side branches is the first rudimentary study
to visualize the fluid flow two-dimensionally in a cross-section using high time-resolved PIV, and to measure the pressure
at the downstream side opening of the cavity by microphone. The fluid flows at different points in the cavity interact, with
some phase differences between them, and the relation between the fluid flows was clarified. |
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