DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT

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DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT ( development-an-ultra-high-efficiency-gas-turbine-engine-uheg )

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output power. Another advantage to the reheat engine is that the benefits of premix combustion can be used in the entire load range. In these engines, the first combustor operates at constant flame temperature through the entire load range, while the premixed second combustor is used to change loads [21]. II.3. Alternative Combustor Technologies Cottle and Polanka [23] studied the Ultra-Compact Combustor (UCC) technology. UCC is based on the previously introduced concept of inter-turbine burner (ITB) [24]- [26]. The concept in these type of combustors is to bring the combustion process into the turbine blade channels in order to simulate the theoretical constant temperature work extraction in the ideal (Carnot) cycle. UCC operates by diverting a portion of the compressor exit flow into a cavity around the engine outer diameter. The cavity is used as the primary combustion zone. The burning mixture is brought back into the main axial flow by use of radial guide vanes or similar mechanisms. Although there are some advantages in these type of combustors, they face some challenges such as inward radial migration of the flow in the core turbine passage [23]. In a combustor called “Multi Injection Burner” developed by Brown Boveri [9] and shown in Figure 12, the complete cross section area of the annular combustor is utilized by using a large number of small burners. Subsequently the flame length and residence time is shortened which will lead to lower NOx emissions. The short length of flame causes a short length combustor which leads to lower cooling air consumption and higher air flow to the burners. Also, some ports for quenching air were arranged near to 21

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