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摘要
A numerical study was conducted to investigate the viscous flow of air, laden with sand particles, in typical engine inlet geometries. Three-dimensional Navier Stokes equations for air and the conservation equations in the Lagrangian framework for the sand particles were solved simultaneously. Four inlet geometries were analyzed, and particle paths, scavenge efficiencies, and the resulting pressure drops were compared. The particle rebound characteristics were calculated from the existing polynomials for typical inlet wall materials. Elastic particle rebound assumption for larger particles (>10 mu m) in the CFD analyses produces erroneous scavenge efficiencies thus, for accurate prediction of particle tracks, appropriate restitution coefficients must be applied. Extremely fine sand particles (<= 10 mu m) follow the air path in the engine inlet, and their removal is proved to be especially problematic. Optimization of the inlet path geometry and manipulation of particle paths can improve scavenge efficiencies for larger size particles. This improvement, however, is often at the expense of higher overall engine inlet pressure drops.
- 出版日期2009-10
- 单位东北大学
