关键词: 水力喷射 空气旋流器, 气液两相流, 数值模拟, 湍动能, 进口气速

Abstract: According to the idea of coupling enhancement, the removal process of high concentration ammonia nitrogen wastewater is improved by using hydraulic jet air cyclone mode, and then a water sparging aerocyclone (WSA) is developed. A WSA is a typical gas-liquid mass transfer device, and the research on the turbulent behavior distribution of its internal fluid is particularly important for the design and optimization of the reactor. For this reason, the Reynolds Stress Model (RSM) is used to capture the complex gas-liquid rotational flow, local reflux, and anisotropy of the radial velocity in the reactor. For multiphase flow in the reactor, the Volume of Fluid (VOF) model is used to capture the change law of the intersection interface of gas-liquid two-phase flow. Finally, based on the simulation results, the distribution of turbulent kinetic energy in the WSA is obtained. The results show that the distribution of the turbulent kinetic energy in the lower axial position of the bottom of the overflow pipe is similar, showing an asymmetric saddle shape with high on both sides and low in the middle. The turbulent flow in the overflow pipe area obtains more energy from the time-averaged flow, which means the energy loss of the time-averaged flow in this area is greater than that of turbulence, especially in the axially downward section of the overflow pipe.