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vulnerable to being overheated. To resolve this issue, besides use of thermal-barrier coating and other new materials and manufacturing technologies [97], blade surface temperature needs to be reduced. Two different cooling approaches for stator blades are studied in this section: one is indexing the fuel injectors relative to each other and the stator blades, the other is using film cooling. Both approaches will be discussed in the following paragraphs. UHEGT uses the inherent vortices in stator channel along with induced vortices by the specifically designed injectors to enhance mixing between air and fuel particles and increase flame stability [15]-[17]. The wakes produced by the injectors carry on the hot combustion gases along the stator channel. These wakes interact with the stator blade surfaces and cause them to exceed their material limits at certain areas. To control the temperature distribution on the blade surfaces, indexing (clocking) method could be used. In this method, the location of the injectors relative to each other and to the stator blades will be adjusted in a way that results in lower temperature distribution over the blade surface. The concept of indexing between the stator and rotor blades of consecutive turbine stages has been studied before by different scholars [94]-[96]. Indexing in conventional gas turbines is considered a way of influencing the flow by changing the circumferential position of rotor-rotor rows and stator-stator rows relative to each other. It is shown that clocking can affect the turbine efficiency by up to 1% which is called clocking effect. But, indexing in the current context (between the fuel injectors and stator blades) is a new concept which will be studied in this section. 98PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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