Numerical investigation on flow field characteristics of integral particle separator
This paper is a study and research result of vane less integral particle separator where numerical simulation of its inner flow field and the particle movement locus characteristic was undertaken with the application of calculation software Fluent. This paper obtains the characteristic of the total pressure loss from the inlet to the clearance stream outlet and the main stream outlet while the SCR differs, and its inner flow field, and also the distribution of total pressure loss at the clearance stream outlet and particle movement locus. The calculation was undertaken by using the Realizable k-ε model and using Lagrange track model for discrete phase. The research result shows: In the clearance stream, the fluid appears of the whirlpool structure. The total pressure loss decreases while the SCR increases, and increases as the main stream flow increases. On the inner side at the clearance stream outlet (near the splitter), the total pressure loss decreases as the SCR increases, while in the outer side (near the outer wall), the total pressure loss increases as the SCR increases. In the main stream, the total pressure loss increases as the SCR and the main stream flow increase. Micro-size particles barely collide with wall, and some of them enter the main stream flow, while most of large grain size particles collide with wall and enter the clearance stream where they are discharged.
Numerical Simulation of Three-dimensions Two-phase Flow in Inlet Particle Separator with Vanes
The numerical simulation about three-dimensional gas-solid two-phase flow was made thinking about the influence of the intake and swirling vanes in the inlet particle separator with vanes,with the aid of computer software-FLUENT.Separation efficiency was obtained for sands with different diameters,the AC coarse dust and C-spec.sand.The computations used standard k-e mode.The results show that separation efficiency increases with the growth of particle size.Effects of flow on the particles enhance with the influence of intake and swirling vanes.The smaller particles are easily leaded into the engine because of the aerodynamic force of core flow.The larger particles are dominated by the inertial effects,so they are separated more from the streamlines.
Investigations of dielectric gratings using electrodynamic models based on volume integral equations
Eigenmodes of planar and cylindrical dielectric gratings (DGs) and electromagnetic wave scattering from multiplayer DGs are investigated. The DG characteristics are calculated using numerical-analytical solution of integral equations (IEs).