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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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combustor liner cooling performance. They performed their experiments on a model test section in which the interaction between swirl flow and coolant flow is studied. Beard et al. [56] performed an experimental and numerical study on the effects of combustor swirl on a high pressure turbine efficiency. Their results show that there can be about 1% efficiency drop due to combustor swirl, but it could be recovered by appropriate design. Agbonzikilo et al. [10] studied fuel injection into a radial swirler of a Dry Low Emission (DLE) gas turbine combustor using experimental and numerical simulations. They concluded that fuel injection into the suction side of the radial swirler slot will enhance the mixing of fuel and air due to lower pressure and secondary flows near the suction side. IV.1.2. Flame Stability One of the major requirements for a gas turbine combustor is to maintain the combustion process over a wide range of operating conditions. The good stability performance of a combustor can be described in two ways: either by the range of fuel/air ratio that provides a stable combustion or the maximum air velocity that the system can tolerate without flame extinction [33]. In other words, if the combustor can handle a larger range of fuel/air ratio or higher speed of combustion air without losing the flame, it has a better stability performance. Among different approaches to stabilize the flame, bluff-body stabilization is often used as an effective method in variable combustion systems. A Bluff-body flame holder can be defined as a geometrical obstacle placed in the path of the reactive mixture; introducing turbulence, secondary flows, and low speed recirculation zones into the domain [33], [57]. 36

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