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efficiency of more than 45% is achieved in this cycle. Based on the thermodynamic cycle, 1D/2D (meanline) approach is used to design the entire flow path for the turbine. In the next section, different injector configurations are designed and studied to develop the optimum combustion system for UHEGT. The important parameters for a suitable combustion unit for UHEGT are: enabling sequential combustion, utilizing inherent secondary flows and induced vortices to provide a stable combustion environment, provide uniform temperature distribution at the rotor inlet, etc. The studies are performed on a single-stage turbine via Computational Fluid Dynamics (CFD) and the simulations are unsteady and include multispecies combustion process along with rotor motion. The flow field is analyzed based on different parameters such as velocity patterns, Mach number, pressure, and temperature distribution, losses and emissions, etc. The final configuration for the combustion system includes two rows of injectors placed before the stator rows in the first three turbine stages. The injectors are hollow tubes extended from hub to shroud with slots on top and bottom for fuel injection. Three or four injectors per stator blade are included in each combustion stage. This configuration provides a highly uniform temperature distribution at the rotor inlet, low pressure loss, low emissions, small weight and volume, and ease of manufacturing compared to the other cases. Von Karman vortices and the Coanda effect help to enhance the mixing between fuel and air particles and increase combustion stability. In the next section, a complete CFD model is developed to simulate multiple stages of the UHEGT turbine with stator internal combustion. Flow patterns, secondary flow losses, temperature distribution, and pollutant emissions are studied in the results in order 154PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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