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IV.6.2. Injector Configuration 2 An infinite blade height (2D) simulation is performed on the second configuration including the stator blade and fuel injectors to provide a general pattern of velocity and temperature distributions. Figure 37 and Figure 38 show the velocity vectors and temperature distribution inside the blade and around the injectors. As shown in Figure 37, the flow expands at the blade inlet due to an increase in cross section. This reduces the air velocity and makes it more appropriate for combustion [33]. Secondary flows are generated as the flow passes the injectors which helps the mixing between the combustion gas particles. Figure 39 shows the temperature contours in the domain. As shown in this figure, the temperature distribution after the stator is not uniform. The high non-uniformity at stator outlet can adversely affect the turbine performance. In order to improve the temperature distribution at this area, two external injectors are added to the combination which is shown in Figure 40. This modification helps to achieve a more uniform temperature distribution at the exit. This Figure 40 configuration provides a very compact space for combustion unit/stator combination and it can lead to small engine sizes. But, it needs to be noted that placing the injectors inside the blade creates a very high flame temperature near the blade internal surface, and also takes out the option for blade internal cooling. Therefore, at this point configuration 2 is not considered an optimum design option for UHEGT. 62PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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