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.
INVESTIGATION OF FLOW CHARACTERISTICS OF SOLID-GAS TWO PHASE FLOW IN TWO-DIMENSIONAL STRAIGHT PASSAGE
In this paper the two-dimensional straight passage experimeat has been done. Pulsesheet-laser, television camera and image technique is used for measuremeat of the flow parameters in fixed quantity. A detailed experimental investigation has been carried out and the velocity, direction and flow structure of solid particle have been obtained. Meanwhile the new collide regular pattern are shown between solid particle and the wall with several inlet velocity of gas and several wall angles of inclination. A new interaction formula has been provided.
Improved Particle Trajectory Calculations Through Turbomachinery Affected by Coal Ash Particles
Trajectories of small coal ash particles encountered in coal-fired gas turbines are calculated with an improved computer analysis currently under development. The analysis uses an improved numerical grid and mathematical spline-fitting techniques to account for three-dimensional gradients in the flow field and blade geometry. The greater accuracy thus achieved in flow field definition improves the trajectory calculations over previous two-dimensional models by allowing the small particles to react to radial variations in the flow properties. A greater accuracy thus achieved in the geometry definition permits particle rebounding in a direction perpendicular to the blade and flow path surfaces rather than in a two-dimensional plane. The improved method also accounts for radial variations in airfoil chord, stagger, and blade thickness when computing particle impact at a blade location.Copyright © 1981 by ASME