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CALCULATION OF GAS TURBINE BLADE TEMPERATURES USING AN ITERATIVE CONJUGATE HEAT TRANSFER APPROACH

DOI: 10.1615/ICHMT.2009.HeatTransfGasTurbSyst.120
14 pages

Mangesh Kane
Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA

Savas Yavuzkurt
Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA

要約

Conjugate heat transfer in turbulent flow over flat plates and turbine blades have been simulated and studied using the commercial computational fluid dynamics code FLUENT in order to calculate metal temperatures. An iterative conjugate heat transfer (ICHT) techniques is introduced and discussed. Comparisons were made between the results obtained from non conjugate (conventional approach), full conjugate and ICHT approaches. For the baseline case of a flat plate turbulent boundary layer, all models performed relatively similar to each other (within 5% and 7% of the data for skin friction coefficient and Stanton numbers, respectively) although results for realizable k-ε model were the best. Mark-II blade which has internal cooling was also simulated. This case was solved using conventional constant wall temperature, full conjugate and the ICHT approaches. Results of conventional constant wall temperature approach deviated from data 30%, whereas full conjugate results were much closer to the data with an overall deviation about a few percent. ICHT results obtained using experimental heat transfer coefficient were within 1-2% of the data overall in terms of wall temperatures. ICHT approach is a compromise between the large computational time and inaccuracies encountered by full conjugate approach and need of experimental data which might be hard to obtain. ICHT can be used in practical applications by the turbine designer by use of experimental knowledge to obtain accurate turbine blade temperatures.

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