Accepted Manuscripts

Hao-Wei Wu, Hootan Zirakzadeh, Je-Chin Han, Luzeng Zhang and Hee Koo Moon
J. Thermal Sci. Eng. Appl   doi: 10.1115/1.4037584
A multi-passage internal cooling test model with an 180° U-bend at the hub was investigated. The flow is radially inward at the inlet passage, while it is radially outward at the trailing edge passage. The aspect ratio of the inlet passage is 2:1 (AR=2), while the trailing edge passage is wedge-shaped and with side wall slot ejections. The squared ribs with P/e = 8, e/Dh = 0.1, a = 45°, were configured on both leading and trailing surfaces along the inlet passage, and also at the inner half of the trailing edge passage. Three rows of cylinder-shaped pin-fins with a diameter of 3 mm were placed at both leading and trailing surfaces at the outer half of the trailing edge passage. For without turning vane case, heat transfer on the leading surface at hub turn region is increased by rotation, while it is decreased on the trailing surface. The presence of turning vane reduces the effect of rotation on hub turn portion. The combination of ribs, pin-fin array and mass loss of cooling air through side wall slot ejection results in the heat transfer coefficient gradually decreased along the trailing edge passage. Correlation between regional heat transfer coefficients and rotation numbers is presented for with and without turning vane cases, and with channel orientation angle ß at 90° & 45°.
TOPICS: Heat transfer, Turning vanes, Rotation, Heat transfer coefficients, Cooling, Cylinders, Fins, Wedges, Flow (Dynamics)
Mohsen Ali Mandegari, Somayeh Farzad and Hassan Pahlavanzadeh
J. Thermal Sci. Eng. Appl   doi: 10.1115/1.4032332
TOPICS: Exergy, Optimization, Wheels

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