tailieunhanh - Exergy analysis of wet compression gas turbine cycle with recuperator and turbine blade cooling

In this work, exergy analysis of the wet-compression gas turbine cycle with recuperator and turbine blade cooling is performed. The exergy destructions in the system components and cycle exergy efficiency are estimated for varying pressure ratios and water injection ratios. | Journal of Automation and Control Engineering, Vol. 1, No. 2, June 2013 Exergy Analysis of Wet-Compression Gas Turbine Cycle with Recuperator and Turbine Blade Cooling Kyoung Hoon Kim and Hyung Jong Ko Kumoh National Institute of Technology/Department of Mechanical Engineering, Gumi, Korea Email: {khkim, kohj}@ Abstract—Turbine blade cooling has been considered as the most effective way for maintaining high operating temperatures while making use of the available component material and has been a challenging area for improving the performance of gas turbine systems. In this work, exergy analysis of the wet-compression gas turbine cycle with recuperator and turbine blade cooling is performed. The exergy destructions in the system components and cycle exergy efficiency are estimated for varying pressure ratios and water injection ratios. Exergy destruction in the combustor and exergy loss due to exhaust gas are dominant and larger for higher pressure ratios and lower water injection ratios. Consequently the exergy efficiency decreases with pressure ratio but can be improved by injecting more water. ratio leads to a better system performance. However, employment of high temperature gas in gas turbines requires materials which can withstand the effects of high temperature operation [8]. One of the ways to overcome the problems resulting from high temperature is to maintain the temperature of the blade at a level low enough to preserve the desired material properties by blade cooling. For a variety of method of turbine blade cooling, there have been many studies modeling the turbine blade cooling process [9]-[13]. The exergy analysis is well suited for furthering the goal of more effective energy resource use, since it enables the location, cause, and true magnitude of waste and loss to be determined [14]. Kim et al. [15] carried out exergy analysis of simple and regenerative gas turbine cycles with wet compression. In this study exergy analysis of the .