Ash Deposition, Gas Turbine, Deposition


Numerical computations were conducted to simulate flash deposition experiments on gas turbine disk samples with internal impingement and film cooling using a computational fluid dynamics (CFD) code (FLUENT). The standard k-epsilon turbulence model and Reynoldsaveraged Navier–Stokes were employed to compute the flow field and heat transfer. The boundary conditions were specified to be in agreement with the conditions measured in experiments performed in the BYU turbine accelerated deposition facility (TADF). A Lagrangian particle method was utilized to predict the ash particulate deposition. Userdefined subroutines were linked with FLUENT to build the deposition model. The model includes particle sticking/rebounding and particle detachment, which are applied to the interaction of particles with the impinged wall surface to describe the particle behavior. Conjugate heat transfer calculations were performed to determine the temperature distribution and heat transfer coefficient in the region close to the film cooling hole and in the regions further downstream of a row of film cooling holes. Computational and experimental results were compared to understand the effect of film hole spacing, hole size, and TBC on surface heat transfer. Calculated capture efficiencies compare well with experimental results.

Original Publication Citation

Ai, W. and T. H. Fletcher, “Computational Analysis of Conjugate Heat Transfer and Particulate Deposition on a High Pressure Turbine Vane,” Journal of Turbomachinery, 134:4, 041020-1 thru 12 (July, 2012).

Document Type

Peer-Reviewed Article

Publication Date







Ira A. Fulton College of Engineering


Chemical Engineering

University Standing at Time of Publication

Full Professor