AN INVESTIGATION OF COMBINED COOLING EFFECTS ON GAS TURBINE BLADES | ||||
| ERJ. Engineering Research Journal | ||||
| Article 3, Volume 23, Issue 2, April 2000, Page 47-66 PDF (962.94 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.2000.71323 | ||||
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| Authors | ||||
| H. A. Abdalla; M. Khalil Bassiouny; T. I. Sabry; Mostafa A. Abdel-Baky | ||||
| Mechanical Power Engineering Department, Faculty of Engineering, Minoufiya University, Shibin El-Kawm, Egypt. | ||||
| Abstract | ||||
| In this paper, experimental measurements of the cascade loss in addition to the local and overall cooling effectiveness on the suction and pressure surfaces of a gas turbine blade cascade are presented. The influence of the coolant ratio and inlet gases temperature on the cooling effectiveness are discussed. The experiments were performed with seven blades linear cascade of the first stage of a gas turbine. The experimental data were conducted for three cases; cold air, hot gas flow without cooling of the blade and hot gas flow with blade cooling. The combined cooling is achieved by a hole and five jets distributed at the leading edge. The experiments include the distributions of blade wall-to-gas temperature ratio and the velocity profiles measurements. The boundary layer parameters, cooling effectiveness and cascade loss were calculated. The influence of coolant temperature, inlet conditions of hot gases on the cooling effectiveness, the boundary layer growth and the cascade losses are investigated. The results indicated that, the cooling of the blade causes substantial increase in the boundary layer thickness and the secondary loss compared with that of uncooled blade. Also, the total loss increases as the flow moves in the direction of downstream and approaching the trailing edge. The comparison between the combined and internal cooling indicates that, the boundary layer thickness and the cooling effectiveness are higher in case of combined cooling which means more efficient in such applications. | ||||
| Keywords | ||||
| Gas turbine; heat transfer; cooling effectiveness; cascade losses | ||||
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