The particulate deposition model developed by The Ohio State University (OSU) in prior University Turbine Systems Research (UTSR) work will be modified to better account for the fundamental physics of particle impact and sticking, including particle and surface properties. Experimental data from OSU's Turbine Reacting Flow Facility (TuRFR) deposition cascade facility will be used to validate the revised model.
The TuRFR facility will be modified to provide for the generation of inlet temperature profile non-uniformities (hot streaks), which will be tracked through the turbine nozzle passage using surface temperature infrared imagery and exit plane temperature measurements. Hot streak evolution and the effect of the hot streaks on deposition will be evaluated. Film cooling will then be added to both the experiments and the computation to evaluate its effect on hot streak migration and deposition. Finally, the model's ability to track hot streak migration will be exercised on a full turbine stage (vane and rotor) using data acquired in the OSU Gas Turbine Laboratory transient turbine test rig. The model will also be used to predict deposition in the rotating configuration, although there will be no experimental validation of deposition in the rotating frame.
This project will modify the particulate deposition model developed in prior work to better account for the fundamental physics of particle impact and sticking. Turbine aerodynamics and heat transfer research will develop advanced cooling technology that will allow for higher firing temperatures which translate into increased cycle efficiency. Specifically, this project will refine the deposition model to include the evolution and migration of hot streaks and the effects of film cooling on hot streaks and deposition, and validate the data using the Turbine Reacting Flow Facility.
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