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Another approach to controlling the blade surface temperature is Film Cooling. Film cooling has been used as a common method in recent years to overcome the constantly increasing cycle temperatures in gas turbines and their negative effects on the blade material. The source of the cooling fluid is usually the compressor output air which has high enough pressure to be injected through the cooling holes and low enough temperature to protect the blade material from overheating. Many scholars have studied different film cooling methods and different ways to optimize them. Studies by Schobeiri and coworkers [100], [101], Nirmalan and Hylton [102], Heidmann and co-workers [103], [104], Abuaf and co-workers [105], Jafari et al. [106], Khodabandeh et al. [107], and Volino and co-workers [108]-[110] are only a few examples of the many studies taken place by different scholars on film cooling methods, hole shape design, blowing ratio effects, and combination of unsteady wakes with film cooling. In the current study, one set of film cooling holes on the leading edge and three sets of film cooling holes on each suction and pressure surface of the stator blade will be used to analyze the effects of film cooling in UHEGT. The first stage of the six-stage UHEGT turbine described previously in this chapter and shown in Figure 52 is used for simulations and analysis in the current section. Four different configurations are studied in this section via Computational Fluid Dynamics (CFD). The first configuration represents the basic scenario which is used as a reference case to evaluate the other configurations. The second and third configurations use indexing approach in order to bring down the stator blade surface temperature. The fourth configuration uses film cooling approach to reduce the surface temperature. Different 99PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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