Prediction of heat transfer for a film cooled flat plate using a computational fluid dynamics analysis
Creators:Schroeder, Timothy M.
Advisor:Dunn, Michael G.
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Publisher:The Ohio State University
Series/Report no.:The Ohio State University. Department of Mechanical Engineering Honors Theses; 2009
It has become common practice within the gas turbine industry to simulate the flow of the primary air stream and cooling gas by using the numerical method associated with Computational Fluid Dynamics (CFD). A variety of CFD programs exist in the commercial market today and within the proprietary industry environment. While most can predict the aerodynamics inside engine turbines, the ability to predict heat transfer for a film-cooled turbine stage remains elusive. The purpose of this project was to benchmark the current state of heat transfer prediction for commonly used CFD software. The commercially available code FINE/Turbo, developed by Numeca International, was tested in this research effort. FINE/Turbo was used because of its ability to provide time-accurate solutions, which will be utilized in future research efforts. The computational model utilized a conjugate heat-transfer model for solid-fluid interactions, as well as 113 individual cooling holes spaced consistent with the turbine blade hardware. Current heat-transfer solutions are in the expected range of theoretical values, although the measurement program is still in process. The addition of cooling flow to the mainstream flow associated with a high-pressure turbine stage is difficult to model, especially when one is attempting to predict the surface heat-transfer rate. Boundary layer conditions and solid-fluid interactions dominate the region, making accurate computational predictions very difficult. Results of this project have identified areas for which improvement in the current state-of-the-art are required, and have provided a benchmark for computational solutions. Lessons learned from the flat-plate measurement program will be applied to a full-scale rotating turbine stage in the near future, so understanding how to predict the local heat transfer using the CFD code is of significant interest.
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