Abstract

A dusty gas flow through two, moving and immovable, cascades of airfoils (blades) is studied numerically. In the mathematical model of two-phase gas-particle flow, the carrier gas is treated as a continuum and it is described by the Navier-Stokes equations (pseudo-DNS (direct numerical simulation) approach) or the Reynolds averaged Navier-Stokes (RANS) equations (unsteady RANS approach) with the Menter k-ω shear stress transport (SST) turbulence model. The governing equations in both cases are solved by computational fluid dynamics (CFD) methods. The dispersed phase is treated as a discrete set of solid particles, the behavior of which is described by the generalized kinetic Boltzmann equation. The effects of gas-particle interaction, interparticle collisions, and particle scattering in particle-blade collisions are taken into account. The direct simulation Monte Carlo (DSMC) method is used for computational simulation of the dispersed phase flow. The effects of interparticle collisions and particle scattering are discussed.

Highlights

  • IntroductionCivilian airplanes can §y into a cloud of volcanic ash

  • Military aircraft can sometimes operate in dusty atmosphere

  • The full system of equations for the URANS approach with the Menter k€ω stress transport (SST) turbulence model is very cumbersome [7, 8] and is not given here

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Summary

Introduction

Civilian airplanes can §y into a cloud of volcanic ash. In all these cases, one deals with a gas€ particle §ow inside engine ducts. The erosive eect from particles can reduce the lifetime of blades and, of the whole engine, up to a factor.

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