Research On Particle Rebound Characteristics And The Performance Of Particle Separator

In order to accurately explore the motion of particles in the inertial particle separator of an engine,the experiment of particle impinging on the wall was carried out.Rebound model was established based on the rebound characteristics obtained by the test,and the numerical simulation was carried out.A self-designed experimental system can realize a single particle impact plat,for a range of impact angle from 10° to 80°.The velocity vectors before and after impact were measured with pictures taken by the high speed camera.Experiment results show that: It's more appropriate to express the restitution coefficient of non-spherical particles with mean value and standard deviation.The tangential restitution coefficient becomes more concentrated with the increasing of the impact angle,while the normal restitution coefficient shows an opposite trend.The normal restitution coefficient is positively skew distribution.The relative distribution range of restitution coefficient impacting different surface is mainly affected by roughness.The normal restitution coefficient or tangential restitution coefficient are more than 1 respectively when the impact angle is close to tangential or normal impact direction.Gas-solid two-phase flow in IPS was simulated with standard k-? model and DPM model.A particle-wall collision probabilistic model was built in UDF based on the rebound experiment result,allowing different diameter particles rebound following appropriate rebound characteristics.Compared with experiment result,simulation result is closed to experiment,which prove that the collision model and simulation method are reliable.Influence of particle rebound characteristics,martial of wall and configuration of IPS on the performance of IPS was obtained with numerical simulation.Results shows: Both decreasing of normal restitution coefficient and increasing of tangential restitution coefficient benefit the improvement of separation efficiency,while too large normal restitution coefficient or too small tangential restitution coefficient will cause times of particles rebounding increasing,which makes separation efficiency fluctuates.When the outer wall expands outwardly,total pressure recovery coefficient of scavenge flow decreases,while the total pressure recovery coefficient in core flow and the separation efficiencies of AC coarse dust and C-spec sand first increases and then decreases.As the front of the hub expands outwardly,the total pressure recovery coefficient of core flow increases,while the total pressure recovery coefficient decreases.At the same time,separation efficiency of AC coarse dust decreases while separation efficiency of C-spec sand increases first and then decreases.