Recent developments in high-performance and high-reliability gas turbine engines necessitate enforced cooling to maintain the blade temperature at reasonably low levels associated with increased turbine inlet temperature and compressor pressure ratio. However, the gas turbine performance is strongly penalized by the consumption of cooling flow, resulting in temperature dilution of hot mainstream, aerodynamic mixing loss, and pumping power loss. In this paper, a new practical blade cooling system using state-of-the-art engineering, which aims at minimizing the dilution effect, is presented. Trade-off studies between performance and reliability in terms of blade metal temperature are performed to evaluate cooling systems. Analytical comparison of different cooling systems demonstrates that the proposed cooling system provides significant improvements in performance gain and growth potential over conventional air cooling systems.
DME (dimethyl ether) is currently attracting worldwide attention due to its potential as a clean fuel. But, DME has a low auto-ignition temperature and a higher combustion velocity compared with other power generation gas fuels (LNG, LPG). Therefore, in the case of lean-premixed design to limit the formation of NOx in the burning zone, a shorter premixing length than that for natural gas is required. In this research, the main objective is the development of a low NOx emission and high efficiency combustion system that is suited to quick and uniform mixing between the air and gaseous DME. A coaxial jet cluster nozzle burner configuration is proposed as the low NOx combustion system, and 18 different configuration burners are designed and tested by the robust design. Based on the analysis of test results, the optimized configuration of a coaxial jet nozzle burner is selected.
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