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Corresponding Author

Mahgoub, Hossam

Subject Area

Mechanical Power Engineering

Article Type

Original Study

Abstract

Heat transfer has been investigated in an equilateral triangular channel with slide length 2 cm, hydraulic diameter Dh = 1.1547 cm with ribs fixed to the internal surface of the channel to simulate the internal cooling channel near the leading edge of the gas turbine blade. The simulation has been done for two different ribs configurations (one wall ribbed and two walls ribbed) with different pitch ratios (p/e) of 5, 7.5, 10, 12.5, Reynolds numbers varied from 20,000 to 70,000 at stationary and rotating channel with speed of 3000 rpm, with rotational number range from 0.39 to1.37. A numerical investigation is conducted using a commercial package (Fluent 6.3.26) where the flow and heat transfer characteristics were investigated. The results show that, the heat transfer coefficient for two walls ribbed is better than for one wall ribbed channel at stationary condition. Also, from the results it is concluded that the best heat transfer occurs at pitch ratio of 10 for one wall ribbed and stationary channel, while the two walls ribbed gives the best heat transfer at pitch ratio of 7.5 either for stationary or rotating channel

Keywords

Gas turbine blade cooling; heat transfer; Equilateral triangular ribbed channel

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