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Configuration 2 presents a total new design for the blade and injectors. It enables the combustion process to take place inside the stator blades which leads to a very compact engine. Cylindrical fuel injectors are placed inside the stator blades and multiple slots are opened on suction and pressure surfaces and the trailing edge. The hot flow exits those slots and flows toward the rotor. Temperature distribution at rotor inlet was improved by adding external injectors. It needs to be noted that in this design, temperature near the blade internal surface may get too high and the blade cannot be cooled internally. In the third configuration, axial swirlers are placed before the stator row for the purpose of vortex generation. This configuration provides a hot core in the center of the domain and low temperature flow near the endwalls. Although the cold flow near hub and shroud can be helpful by protecting them from the hot flame radiation, the hot core is highly concentrated in the center of the domain. So the temperature distribution at rotor inlet is not quite uniform which have negative effects on the engine performance and reduces the amount of power generated by rotor. Moreover, since all the fuel is injected in the center, it takes some time for fuel particles to mix with air and burn. Therefore it was observed that the burning process continues up to the early stages of the rotor blades. The non-uniform temperature distribution causes the temperature in the core and near the blade surfaces to rise very high which is not a favorable design parameter. Another observed phenomenon is that the hot core does not follow the centerline of the domain and it is deviated towards the shroud, which is most likely due to the swirling flow. This configuration has a slightly higher than standard NOx emission and low pressure loss. 74PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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