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lead to a total efficiency loss. Another disadvantage of high TIT is an increase in the pollutant emissions as a results of the higher flame temperatures [21]. It will also make the manufacturing process more difficult as the system requires more advanced and expensive materials. In UHEGT, high thermal efficiencies can be achieved without a dramatic increase in TIT. TIT=1500 K is considered as the maximum temperature limit in the current cycle design. This temperature limit allows us to achieve the main objectives of the design which are high thermal efficiency, high output power, and low emissions, without the downsides of a super high TIT system. It should be noted that the highly advanced Mitsubishi GT G-series with TIT close to 1800 K has less than five percentage point thermal efficiency compared to UHEGT [93]. The next deciding factor in cycle design for UHEGT is the distribution of pressure ratios on different turbine stages. An optimization program is developed in FORTRAN to calculate what combination of the pressure ratios produces the best performance for the system. The results show that the maximum cycle efficiency is achieved when the first two turbine stages have a pressure ratio of between 1.4-2 each; with the rest of the pressure applied on the following stages. It is also shown that higher pressure ratio in the first two stages results in higher output power. As both high efficiency and output power are important factors in the design, a compromise between the two criteria results in an optimum outcome. Other than that, we tried to maintain a reasonable balance between the fuel flow rates injected in each combustion stage. Therefore, we avoided injecting too much (more than 50%) or too low (less than 10%) of the total fuel mass flow in any of the three combustion stages. Considering all of the parameters above, Figure 51 shows the 80PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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