非规则砂尘颗粒三分量气动力特性试验方法OA

In recent years,the motion characteristics of sand particles within inertial particle separators have received widespread attention.The aerodynamic properties of particles serve as the basis for understanding their migration behav-ior.Conventional settling experiments,commonly employed in studies of particle aerodynamic characteristics,exhibit inherent limitations in orientation control,force measurement dimensionality,and Reynolds number regulation,render-ing them inadequate for precise characterization of the three-component aerodynamic forces acting on irregular sand par-ticles.To overcome these constraints,this study employs a set of representative abstract models of irregular sand par-ticles and conducts direct force measurements using a six-component balance to capture drag,lift,and sideway forces.A magnetically driven slider system is utilized to propel the force measurement system and particle models through a qui-escent glycerol-water solution at constant velocity,thereby simulating an equivalent uniform inflow.A series of three-component force measurement experiments are conducted under varying equivalent inflow conditions to obtain the hy-drodynamic forces acting on particles in liquid.The results indicate that the drag coefficient is primarily influenced by both the Reynolds number and the sphericity.Specifically,the drag coefficient decreases consistently with increasing Reynolds number;at a fixed Reynolds number,particles with lower sphericity exhibit significantly higher drag coeffi-cients than those with higher sphericity,with this difference becoming more significant in the high-Reynolds-number re-gime.The influence of inflow angle on aerodynamic forces exhibits a notable dependence on particle shape.Particles with lower sphericity exhibit greater variations in drag coefficient with changes in inflow angle,revealing a more no-table aerodynamic dependence on angular variation.Under identical angular conditions,sideslip angle produces a stron-ger enhancement in both drag and sideway force than angle of attack.Finally,a drag coefficient correlation is developed based on the experimental data,incorporating Reynolds number,sphericity,angle of attack,and sideslip angle,provid-ing fundamental data and methodological support for multi-variable drag modeling.