<p>Accurate predictions of heat transfer through internal cooling channels are necessary to improve the performance of cooled gas turbine blades. This work will use conjugate heat transfer simulations and experimental data to determine the internal heat transfer through a straight passage. The experimental data comes from a facility that supplies heated air through a straight rectangular passage venting into a vacuum tank. An infrared camera measures the external surface temperature as the passage heats up, and thermocouples capture the fluid temperature during the experiment. This temperature history data is provided to a 1-D and 3-D conduction model which determines the heat transfer from the fluid to the passage walls. This scenario is recreated in transient conjugate heat transfer simulations using three different turbulence models: the standard k-ε model, k-ω shear stress transport, and the Reynolds Stress Model. Internal heat transfer and external temperatures from the three simulations will be compared to the experimental data and data from other works to determine the most appropriate turbulence model. The conduction model will be verified by comparing the heat transfer predicted by the simulations and the results from the conduction model using the external temperatures predictions as the input. Verifying this conduction model creates a new way to utilize data captured from infrared cameras; internal heat transfer can be predicted from the 2-D infrared temperature measurements. This will be especially beneficial to data captured by infrared cameras operating in transient facilities as researchers will be able to qualitatively determine the internal heat transfer such as that seen in turbine blade cooling. Finally, convergence strategies used will be discussed alongside the comparison between the data and predictions.</p><p>Results from this work will support the application of 1-D and 3-D conduction models to data captured by a high-speed infrared camera for a full-stage rotating turbine operating in a short duration facility. This will increase the value of the data as it can be used to evaluate the internal cooling performance of turbine blades. Modeling strategies will help develop full stage turbine conjugate heat transfer models to evaluate how the internal and external flows interact with the blade.</p>

Investigating Heat Transfer in a Straight Cooling Passage Using Transient Infrared Temperature Data and Urans Conjugate Heat Transfer Analysis

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2021/volume/84898

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