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Recently, various methods have been developed to improve the performance of gas turbines for combined cycle power plants. This paper especially focused on the gas turbine with a reheat process. The purpose of this study is to analyze performance characteristics of a reheat-cycle gas turbine on both a design point and off-design operations. Results of the parametric study of this model show how operating and design parameters influence on the performance of the gas turbine. Moreover, possibilities for the analysis of off-design performance based on a self-generated compressor performance characteristic map are presented.* 서울대학교 대학원 기계항공공학부† 책임저자, 회원, 서울대학교 기계항공공학부E-mail: jlsohn@snu.ac.krTEL: (02)880-7434 FAX : (02)889-6205