The whole annulus computations of particulate flow and erosion in an axial fan

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Proceedings titleProceedings of the ASME Turbo Expo
ConferenceASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011, 6 June 2011 through 10 June 2011, Vancouver, BC
Pages12891299; # of pages: 11
SubjectAxial fans; Blade row; CFD models; Computational costs; Down time; Dust particle; Erosion damage; Erosion patterns; Experimental data; Flow physics; Gas phase flow; Hostile environments; Intensive research; Lagrangian particle tracking; Life assessment; Maintenance cost; Multi-stage; Numerical algorithms; Numerical predictions; One-way couplings; Particulate flows; Power industry; Prediction methods; Sand erosion; Sand particles; Single blades; Stator-rotor interactions; Steady-state simulations; Turbomachinery flows; With inlets; Algorithms; Axial flow turbomachinery; Exhibitions; Forecasting; Erosion
AbstractGas turbine engines operating in a hostile environment, polluted with sand or dust particles, are susceptible to the erosion damage, mostly at front axial fans and compressors. To accurately predict the erosion pattern and rate due to sand ingestion is one of the big challenges faced by the transportation and power industries. Maintenance costs are scrutinized and intensive research efforts are currently deployed in predictive life assessment tools to minimize the overhaul down time. The conventional prediction methods were usually based on steady-state simulations of gas-phase flows through a single blade passage per blade row to reduce computational cost. However, the multi-stage turbomachinery flows are intrinsically subject to unsteadiness, especially due to stator-rotor interactions which may affect sand particle trajectories even if a one-way coupling method is considered. Furthermore, an unsteady stator-rotor interaction asks for a whole-annulus model at great computational cost to avoid simplifications of geometries or flow physics. To study the effects of the stator-rotor interaction on sand particle trajectories and erosion, an axial fan with inlet guide vanes is investigated based on the whole annulus computations of both steady and unsteady gas-phase flows, each of which is then followed by a Lagrangian particle tracking step. A numerical algorithm for tracking particles driven by unsteady gas-phase flow is presented. The comparison of the numerical predictions with the experimental data confirms the validity and necessity of the unsteady CFD model in providing adequate predictions of sand erosion in the axial fan. Copyright © 2011 by Her Majesty the Queen in Right of Canada.
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AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21271427
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Record identifier53ce5511-d90b-4c5b-b2ad-2527fb39e68b
Record created2014-03-24
Record modified2016-05-09
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