抄録
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.
