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the main fan which is the main provider of thrust in a high-bypass ratio engine. The bypass ratio is defined as the ratio of air mass flow bypassing the engine core (turbine and combustion chamber) to the air mass flow going through the engine core. Figure 4 shows the Rolls Royce Trent 1000 engine with bypass ratio of 10:1. I.3. Efficiency Evolution of Gas Turbines The basic cycle efficiency of the gas turbines prior to 1986 was in the range of 32%-35% [5]. To achieve higher efficiencies, Turbine Inlet Temperature (TIT) has to be substantially increased which requires extensive amount of cooling in the front turbine stages. Studies in [6]-[8] show that a significant efficiency improvement can be achieved by introducing the reheat concept in CAES-turbine design. Figure 5 quantitively shows the efficiency improvement achieved using the reheat concept. The blue curve in this figure represents the efficiency of a relatively advanced GT with conventional thermodynamic cycle. The green curve, on the other hand, represents the efficiency of a generic reheat gas turbine [5]. This concept was adopted by Brown Boveri1 company in GT24/26 engine, shown in Figure 6. As shown in this figure, GT24/26 has two combustion stages and a reheat turbine stage. The background and evolution of this concept is discussed in further details in the next chapter. 1 Former Brown Boveri (BBC), then Asea Brown Boveri (ABB), now GE-Alstom. 5PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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