Abstract

Particle deposits that form in gas turbine engines can change flow dynamics and heat transfer, leading to performance degradation. A computational framework that models the coupled behavior of sand deposits with flow and heat transfer is developed. The coupling is done by using a multiphase framework in which a physics based collision model is used to predict the post-collision state-of-the sand particle. The collision model is sensitized to temperature dependent material properties of sand. Particle deposition is determined by the particle’s softening temperature and the calculated coefficient of restitution of the collision. The multiphase treatment facilitates conduction through the porous deposit and the coupling between the deposit and the fluid field.

The coupled framework is used to model the behavior of sand particles in a laminar impinging jet flow field. The temperature of the jet and the impact surface are varied between 1000 to 1600 K, to observe particle behavior under different temperature conditions. The Reynolds number of the jet is varied between 20 to 100 to vary particle Stokes number between 0.5 to 3.2. The coupled framework was found to increase or decrease capture efficiency, when compared to an uncoupled simulation, by as much as 10% depending on the temperature field. Deposits that formed on the impact surface, using the coupled framework, altered the velocity field by as much as 130% but had a limited effect on the temperature field for the short duration of the simulations.

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