1021 差分格子ボルツマン法による主蒸気止弁でのホールトーンの解析評価(OS10-5 流体関連振動・騒音,オーガナイズドセッション)

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  • 1021 Numerical Analysis of Hole-Tone in Main Steam Stop Valve Using Finite Difference Lattice Boltzmann Method

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Main steam stop valves in thermal or nuclear power plants are liable to do an excitation of sound, as called hole-tones. This phenomenon is undesirable because die induced sound causes loud noises and vibrations of mechanical structures. In this study, we investigated the hole-tone in the main steam stop valve using the finite difference lattice Boltzmann method (FDLBM). In order to improve accuracy of the FDLBM, an explicit four-stage second order Runge-Kutta time integration method and a sixth order central difference scheme were applied to discretization of the governing equation. Dynamic Smagorinsky model was also introduced into the governing equation as a turbulence model. Numerical results showed that expansion waves were generated by collision of vortices with the downstream edge. A pressure spectrum obtained by the numerical simulation agreed well with that of the experimental results.

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