TY - JOUR ID - 75604 TI - Influence of Different Steam Cooling Techniques for High Pressure Turbine Blades on the Performance of Gas Turbine JO - Iranica Journal of Energy & Environment JA - IJEE LA - en SN - 2079-2115 AU - Vadlamudi, T. C. AU - Kommineni, R. AU - Katuru, B. P. AU - Injeti, N. K. N. AD - Department of Mechanical Engineering, R.V.R & J.C College of Engineering, Guntur, India AD - Department of Marine Engineering, A.U. College of Engineering, Visakhapatnam, India Y1 - 2018 PY - 2018 VL - 9 IS - 3 SP - 168 EP - 175 KW - Gas turbine blade cooling KW - Internal convection cooling KW - Film and Transpiration cooling KW - irreversibility KW - Entropy generation rate DO - 10.5829/ijee.2018.09.03.03 N2 - Gas turbines are always intended to give more specific work output for which continuous exposure to hot combustion gases is necessary. To increase the lifespan of the turbine blades active cooling should be applied to the High Pressure (HP) turbine blades. In the present work, a simple open cycle gas turbine is modeled to carry out thermodynamic analysis with different open loop steam cooling techniques: steam internal convection cooling (SICC), steam film cooling (SFC) and steam transpiration (STC) cooling. The effect of Turbine inlet temperature (TIT), Turbine blade temperature (T_b), and Compressor pressure ratio (CPR) on the coolant flow requirement and effect of T_b on the performance are estimated. The entire analysis is carried out with contemplation of variable specific heat (VSH) along with constant specific heats (CSH) for air and gas. Between VSH and CSH approaches, the former analysis leads to better performance from the first and second law efficiencies point of view. Irreversibility and Entropy generation rate are maximum in the combustor and they are less for VSH case in all cooling schemes and are decreased by 38.53%, 40.01%, and 40.40% for SICC, SFC and STC schemes respectively when compared with CSH(at TIT=1580 K, T_b=1123 K, CPR=19.1) analysis. UR - https://www.ijee.net/article_75604.html L1 - https://www.ijee.net/article_75604_464d7108b335c02994fc8f400a5add21.pdf ER -