A NUMERICAL STUDY OF DUST DEPOSITION IN A MODEL TURBINE VANE COOLING PASSAGE
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Copyright 2018 ASME. Dust accumulation in jet engines reduces engine efficiency and even affects aviation safety. A computational fluid dynamics study was carried out to evaluate the capability of a computational fluid dynamics (CFD) wherein the Ohio State University coefficient of restitution model (OSU model) was incorporated. The model was used to determine the effects of particle size and operating conditions similar to experiments in dust deposition in the cooling passage in a turbine vane. An impingement hole array was used to model the turbine vane cooling passage, so that the flow interactions between neighboring jets could be accounted for. The Discrete Phase Model in ANSYS Fluent was used to predict the particle impact locations, after convergence of the flow field simulation. Deposition results were obtained for an inlet-to-outlet pressure ratio of 1.015 with back pressure of 1 atm and three temperatures (300 K, 700 K and 1000 K). The CFD predictions of dust deposition qualitatively agree with experimental results. However, quantitative agreements between the CFD model and experiments will be pending improvements of the model, in areas such as thermophoretic deposition, resuspension simulation and coefficient of restitution model that accounts for varying surface conditions.
