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core does not mix completely with the surrounding flow. Therefore the temperature distribution at rotor inlet is not quite uniform which can adversely affect the turbine performance. The non-uniform temperature distribution in this case results in 14.7% lower power generation compared to configuration 1. That is because the high enthalpy combustion gases are not distributed properly around the rotor blades. The reason behind the low mixing between the hot core and the surrounding flow can be the high pressure and density of the fluid. In the simulated models with very low inlet pressure (1.5 bar), more mixing was observed. The low amount of mixing causes the temperature in the core to rise very high. This generates a very hot flow near the blade surfaces which is not favorable with regards to blade material and manufacturing. Figure 47 shows the meridional temperature distribution. As shown in this figure, maximum temperature is reached at the early stages of rotor blade which means the combustion process is taking place up to that area. Also it is seen that the hot core is not expanded and mixed with the surrounding flow as explained before. The other phenomenon is that the hot fluid in center does not follow the centerline. This is most likely due to the swirling flow and it causes the maximum temperature to occur at about span=0.6. Figure 48 and Figure 49 show the average temperature and average fuel mass fraction changes with regards to streamwise location from inlet to exit, respectively. As shown in Figure 48, temperature rises at a high rate after the fuel injection. The rate of temperature rise decreases as it approaches the stator blade. That is because of the increase of kinetic energy in stator. After the stator trailing edge the temperature increases with a 68PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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