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Received: (17 January, 2021) Revised: (16 March, 2021) Accepted: (20 March, 2021) Corresponding Author: I. E. El-Helw: is with the Mechanical Power Engineering Department, Badr University Cairo, Badr 11829, Egypt (e-mail: ismail.ezz.mail@gmail.com). S. H. El-Emam: is with the Mechanical Power Engineering Department, Mansoura University, Mansoura 35516, Egypt (email: selemam45@yahoo.com). G. I. Sultan: is with the Mechanical Power Engineering Department, Mansoura University, Mansoura 35516, Egypt (e-mail: gisultan@mans.edu.eg). W. M. El-Awady: is with the Mechanical Power Engineering Department, Mansoura University, Mansoura 35516, Egypt (e-mail: Welawady@yahoo.com). weight [1]. Increasing turbine inlet temperature has a major impact on increasing turbine efficiency, but on the other hand, it induces several modes of failure on the blades as: thermal fatigue, creep, and erosion and corrosion [2]. The rise in the turbine inlet temperature may be achieved either by enhancing blade material which is still limited or by using cooling techniques [1]. The temperature of turbine blade can be decreased by 200°C to 300°C when 1.5% to 2% of the air mass flow rate taken from the compressor is used for cooling [1]. Various methods are used for cooling such as impingement and normal convection, but film cooling is considered as one of the most commonly used and effective methods in this approach [2]. Over the last years, film cooling is intensively investigated [3]. The main investigated parameters are the blade design configuration, shape and spacing of the film holes, and characteristics of mainstream and coolant flow. The effect of the hot freestream Reynolds number and coolant density has been taken by Li et al. [4]. They found that Investigation of Film Cooling Effectiveness under Different Reynolds Numbers and Rotation Conditions

Investigation of Film Cooling Effectiveness under Different Reynolds Numbers and Rotation Conditions. (Dept. M)