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Following the introduction of sequential combustion into Alstom gas turbines in 1990, a second EV burner called SEV burner was utilized after the first expansion process. In the SEV burner, carrier air which is extracted from compressor is used to enhance premixing and as an ignition controller [9]. One of the recently introduced concepts in gas turbine combustion is the Shockless Explosion Combustion (SEC). SEC, suggested by Bobusch et al. [28], intends to enable the approximate constant volume combustion (aCVC) in the gas turbine engine. In aCVC, combustion process takes place in constant volume instead of constant pressure which can theoretically lead to thermal efficiency improvement. Reichel et al. [29] performed an experimental investigation of an SEC system. SEC is based on a periodic combustion process which intends to create a lasting pressure wave inside a combustion tube. Combustion of the fuel-air mixture takes place in phase with the pressure wave raising the pressure at the tube inlet. After that, when the pressure at the tube inlet gets below the plenum pressure (suction wave), the tube is filled with the compressor air. After filling the tube with a small portion of pure air, fuel is injected into the tube to create a nearly homogeneous combustible mixture. The pure air packet is used to separate the fresh fuel- air mixture from the hot gases of the previous combustion cycle in order to prevent premature combustion. The entire packet of fresh fuel-air mixture undergoes a spatially quasi-homogeneous autoignition process due to the high temperature of the compressor air. In this process, the combustion takes place in a constant volume process with an increase in pressure and temperature. Because of the homogeneity of the ignition process, 24PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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