Research Of Particle Trajectories Numerical Simulation Method In IPS

With good mobility, helicopters are very useful in mountains, deserts and other severeenvironments where small particles may enter into the engines. Inhalation sand will reduce theperformance and life of the engine, and installation of particle separator to purify the intake air isnecessary. At present, multi-phase flow method has been widely chosen in the research of particletrajectory in separator channel and experience formula is used to calculate sand-wall collision-reboundparameters in this method. The particle incidence angle is the only independent variable in the formula,so it cannot reflect the effect of other conditions, for example the particle incident velocity, wallmaterials and so on. However, particle trajectories mainly are determined by collision-rebound basedon previous research. Several accumulations of this simplification will eventually lead to a largedeviation in the calculation of trajectory. To solve this problem, VC++platform and OOP have beenused to develop a particle trajectory numerical simulation program in this paper. And here the particletrajectory numerical simulation is divided into two parts: movement in the air flow andcollision-rebound with the wall of Inertial Particle Separator (IPS).First of all, after meshing grid of the three-dimensional model of a bladeless IPS (Inlet ParticleSeparator) using ICEM, FLUENT is used to calculate internal flow field without the presence of sand.By use of database technology, the data of all the aerodynamic parameters results along with the nodalcoordinates are imported into SQL SERVER database table. Then simplification of the single particleforce in the flow field according to the characteristics in this article.Afterward, establishing the collision-rebound model of spherical ball and infinite plate and settinginitial conditions using LS-DYNA and dynamic simulating of the collision process using ANSYSMechanical Launcher have been done first. The simulation results are compared with experimentalresults obtained by Grant, Malak and Tabakoff. Then the basic table of collision-rebound parameter isestablished, as well as the tables of impact factor which the influence by wall moving.Finally, the complete particle trajectory in the separator is obtained by integrate the above twoparts through particle trajectory numerical simulation program. Then all particle trajectories andstatistical rule of final radial position are outputted by multiple calculations. A new numerical simulation method of particle trajectory in IPS is explored and implemented.Due to the utilization of database technology, this method can not only get result fast but also takevarious initial conditions into consideration, so the accuracy of the numerical simulation is greatlyimproved. Especially the module of the collision-rebound also can be extended to a variety of similarstudies. The work in this paper has contributed to guide IPS surface design.