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studied: the first is based on indexing (clocking) fuel injectors relative to each other and the stator blades and the second is based on using film cooling. Four different configurations are designed and simulated via CFD to evaluate the effectiveness of the two approaches. Based on the results, the configuration with indexing approach provides the best option in lowering the stator blade surface temperature. This configuration brings down the average stator blade surface temperature to near the compressor air temperature which is ideal for the blade material. The blade surface is completely protected against the hot combustion gases in this configuration. However, this configuration produces a higher temperature non-uniformity compared to the other configurations. The higher non- uniformity could negatively affect the rotor blade material, but it does not noticeably reduce the amount of power generated by the rotor. Moreover, this configuration uses the lowest number of injectors per blade, produces the least amount of total pressure loss, and is the easiest configuration to manufacture. Therefore, the indexing in this configuration is the best option in reducing the stator blade surface temperature among the cases studied in this research. Film cooling approach can be considered the second-best option in controlling the blade surface temperature. This approach successfully brings down the average stator blade surface temperature by more than 100 degrees and produces a highly uniform temperature distribution at the rotor inlet. For the second and third turbine stages with stator internal combustion, a similar indexing approach could be used to optimize the temperature distribution. The fuel injectors need to be indexed based on the flow patterns and temperature distribution in each stage. Moreover, use of film cooling is recommended for the rotor blades. 156PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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