Experiment Research And Numerical Simulation For The Gas-solid Two Phases Flow In Inertia Separator

Based on separator of T800 helicopter engine, furcated duct model is got. Experiments and simulation are done for the model. Then it is simplified to different angles of pipes followed by the flow shape. Gas-particle flow in cubic with injection is researched because of the low separation efficiency for the micro-particles near wall. It will provide evidence to design more efficient inertia separator. In this thesis, ball particle force balance and particle-wall impact model are analyzed. Particles trajectory and concentration can be gotten by high-speed photography and PIV technology combined with image processing technology. Gas-solid separation phenomenon is investigated by using the commercial code FLUENT coupled with EDEM. The particles'diameter ranges from 5μm to100μm, and the gas velocity change from 10m/s to 100m/s.Conclusion from theory analysis, experiments and numerical simulation are as follows:(1) For the furcated duct, the separation efficiency of particle is related to particle physical nature, structure, air velocity and so on. The separation efficiency of lump corns is better than ball millets, which have the same density with corns. With the increase of air inlet velocity, separation efficiency of particles whose diameter is under 100μm will raise gradually. But if the diameter is bigger than 100μm, efficiency will be affected by velocity and collision. Backflow caused by SCR also decides separation efficiency.(2) Distribution coefficientηand mean square deviationσare put forward.ηand the extent of cluster of micro-particles (10μm) in the curved pipe increase with the increment of curved degree and gas velocity. But the pressure loss will increase. For the 90o curved pipe flow, if the main velocity of gas or particle diameter or particle density is lager, micro-particles will be easier to be separated.(3) For the cubic with jet flow, particles affected by the injection will congregate in the upper area of cubic. Concentration of particles near up wall increases with increment of distance from jet hole. And it decrease in the down area except the position near base wall. If the particles are smaller, the impact of injection is larger. The velocity of jet is larger, the area of low concentration is wider.