Numerical Simulation Of Axisymmetric Inlets Square Separator

The birth of square separator has more than 10 years, and there are many researches on its performance. In this paper, using the method of numerical simulation to research the two-phase flow in the axisymmetric inlets square separator, including the basic flow characteristics, separation efficiency and comparing the different between single-inlets and double-inlets separator. Discussed the effect of reflecting cone's geometrical sizes on pressure loss and efficiency. And the wall erosion condition because of solid particle impingement.In this paper, using AutoCAD to create geometric model, establishing mesh by Gambit, using Fluent to simulation, and showing results by Tecplot and Oringin.In flow field research, the simulation of continuous phase used in the Reynolds Stress turbulence model (RSM), the calculation of the particle is applied DPM discrete phase model which based on Lagrangian perspective. The results indicate that the flow field of this separation is two-layer structure and intensive shearing action exists between the two layers. The distribution of axial velocity, radial velocity and tangential velocity takes on a good symmetry. The square corner impacts on tangential velocity mostly. Below the reflecting cone in separator the high static pressure and low velocity is its main characteristic.In this paper, presented two type inlets separator's five typical particle trajectories, discussed the pressure loss by the velocity, compared the performance of them. In 10m/s inlets airflow velocity conditions, the single-inlet separator have a good effect to 15μm above particle, and the double-inlets separator have a good effect to 8μm above particle. In the same flux conditions, the single-inlets separator's separation efficiency somewhat better, but the pressure loss is higher.By changing the value of top orifice diameter, height and bottom diameter at the reflecting cone to research their effects on the performances of separation, and discussed their velocity diffusion. Results showed that the reflecting cone's geometry parameter has little effect on the separator resistance, but has a greater impact on its efficiency.Erosion damage is common in solid particle separator because of particle impingement and other reasons. In the end, discussed the Erosion damage by calculate the collision condition on different walls. In general the upside surface of reflecting cone and the wall of gathering-dust cone are the parts eroded worse than other places. Some ways or measures to lower wall erosion are put forward basing on the results of numerical simulation.