Flow characteristics of pressure reducing valve with radial slit structure for low noise |
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Authors: | C Youn S Asano K Kawashima T Kagawa |
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Institution: | (1) Department of Civil and Environmental Engineering, Tokyo Institute of Technology, M1-1, 2-12-1, O-okayama, Meguro-ku, Tokyo 152-8552, Japan;(2) Precision and Intelligence Laboratory, Tokyo Institute of Technology, R2-45, 4259 Nagatuta, Midori-ku, Yokohama 226-8503, Japan; |
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Abstract: | Pressure reducing valves are widely used to maintain the pressure of gas reservoirs to specific values. In a normal valve,
supply pressure is decompressed with an orifice structure. When compressed air passes through the orifice structure, considerable
noise occurs at the downstream side. In this paper, we have developed a radial slit structure that can reduce pressure without
noise. The noise is reduced by changing the orifice structure into the radial slit structure. The radial slit structure valve
reduces pressure without noise by suppressing the generation of turbulence and shock wave at the downstream. The analysis
of the flow in radial slit structure was achieved by CFD2000 software. The flow rate and pressure distribution were simulated
and compared with the experimental result. To confirm the generation of shock wave, the flow of orifice and radial slit structure
at the downstream was visualized by Schlieren photography method. A shock wave was generated in the orifice structure, but
no shock wave was generated in the radial slit structure. Noise reduction efficiency was investigated by the experiment. The
experiment apparatus was set up to JIS standards. The experimental results indicated that the noise level decreased by approximately
40 dB in the slit structure. It is confirmed that the radial slit structure has effectiveness for low noise in the pressure
reducing flow. And, it is expected that it can be applied to various kinds of industrial fields. |
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