旋风分离器出口边界条件对其流场模拟结果的影响

The influence of the gas outlet boundary conditions, which includes outflow boundary condition and pressure-outlet condition, on the numerical simulation of the flow fields in a cyclone separator have been studied by comparison with the LDV measurements in this paper. It is shown that results obtained by using gas outflow boundary condition predict the axial and tangential velocities with some deviations, especially in the vortex core region and within the vortex finder. The simulated flow fields with pressure-outlet boundary condition are in reasonable agreement with the LDV measurements, and hence the pressure-outlet condition is more suitable for simulating the strongly swirling flow in a cyclone separator