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Figure 65 shows the midspan temperature distribution in the four configurations. As shown in the figure on top left, the temperature is uniformized along the stator channel and a uniform temperature distribution is achieved over the rotor. But, due to a direct interaction between one of the injectors’ wakes and the stator blade, the temperature on the blade surface is increased to a high level (above 1600 K). This would negatively affect the overall performance of the system by requiring the stator blade to be cooled down due to material limitations. In order to avoid the direct interaction between the stator blade and the injectors wakes, the injectors are indexed relative to the stator blade in the second and third configurations. In the second configuration which is shown in Figure 65 top right, the one injector that was located in front of the stator LE in the previous configuration is removed. In this scenario, three injectors are distributed in the circumferential space between the two adjacent stator blades and a certain circumferential distance is kept between the injectors and the LE’s of the blades. The results show that a cool layer of flow is preserved near the stator blade surface in this case. The temperature in this layer is nearly the same as the compressor exit temperature which can completely protect the blade from the high flame temperature. On the other hand, it is seen that the temperature distribution over the rotor in this configuration is not as uniform as configuration 1, which can adversely affect the system performance. In configuration 3, shown in Figure 65 bottom left, four injectors are distributed in the circumferential space between the two adjacent blades while keeping a certain circumferential distance from the LE’s of the blades. Adding one injector between the two blades could potentially increase the temperature uniformity over the rotor blades. As seen in the figure, the cool layers of air 103PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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