Particle Deposition in Internal Cooling Cavities of a Nozzle Guide Vane: Part II — Analytical and Computational Modeling

Abstract

Computational and analytical studies were conducted to investigate particle deposition in the internal film cooling cavities of nozzle guide vanes. Transient deposit growth data were acquired from experimental studies to compare to computational simulations. Particle impact locations were predicted by an Eulerian-Lagrangian particle tracking model and shown to follow analytical trends of aerodynamic lensing. Deposit growth was dominated by the locations of concentrated particle impacts. However, significant deposit growth trends occurred in regions not predicted by the particle tracking model. Simulations were performed to determine if the presence of deposit structures significantly altered subsequent particle trajectories and deposit growth. This effect only moderately improved the comparison with the experiment. The local wall shear was investigated on the deposit surface, and deposit growth was shown to occur in regions of low shear. A shear-based sticking model was developed and applied to computational simulations. The shear-based sticking model qualitatively matched deposit growth trends not observed using several other applied sticking models.