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Table 6. Comparison of the performance parameters between different configurations Config 1 Config 2 Config 3 Config 4 Average stator surface temp. (K) 1341.0 855.2 887.0 1233.7 Rotor inlet temp. NUI (%) 4.1 26.2 27.2 6.3 Rotor power generation (MW) 23.0 22.5 22.8 22.8 Total pressure loss over injectors (%) 0.68 0.57 0.73 0.69 od. In the third and fourth columns of the table, rotor inlet temperature non-uniformity index and rotor power production values can be observed. Based on the results, the non- uniformity index is much higher in configurations 2 and 3. This higher NUI means more hotspots which could negatively affect the rotor blade material [66], [69]. However, NUI at the current levels for configurations 2 and 3 is still lower than many industrial engines which could have nonuniformities as high as 40% and more ([70], [71]). Moreover, as seen in the fourth column, the higher NUI in configurations 2 and 3 does not lower the power generated by rotor. The injectors total pressure loss values are also compared in the last column of the table. Based on the results, configuration 2, which uses the least number of injectors per blade (3), produces the least amount of total pressure loss. That would be even more considerable when the injectors are used in the second and third turbine stages in UHEGT where the pressure loss caused by injectors tends to be higher [17]. Also, it is seen that configuration 3 has a slightly higher pressure loss compared to configuration 1. That is because of the injectors in the second row of configuration 3 are located close to each other. Overall, based on the results, configuration 2 produces the best temperature distribution over the stator blade surface, generates the least amount of total pressure loss 111PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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