マイクロガスタービンにおける水噴射効果に関する研究

抄録

This study is related to water injection on a micro gas turbine engine. Water injection tests have been carried out for a CapstoneC30 micro gas turbine. The injection ratio has been varied within the range of 1.00% to 4.27%. The evaporation rate of liquid droplets is calculated based upon mass transfer between liquid droplet and surrounding air flow. Then, experimental data of water injection have been analyzed. Water injection tends to cause the decrease of combustion efficiency because water is unburnable fluid. The decrease of combustion efficiency leads to the reduction of power output. Therefore, it can be considered that ethanol is valid fluid because of its combustibility. In this paper, experimental data have been analyzed with ethanol physical property as well as those of water. The variations of important parameters such as air temperature, droplet temperature, droplet diameter, and amount of evaporation along flow path have been analyzed and the obtained results have been compared for both cases of water and ethanol.