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research-article

Heat Transfer in a Rib and Pin Roughened Rotating Multi-Pass Channel with Hub Turning Vane and Trailing-Edge Slot Ejection

[+] Author and Article Information
Hao-Wei Wu

Department of Mechanical Engineering, Texas A&M University, 3123 TAMU, College Station, TX 77843
zwoodwu@gmail.com

Hootan Zirakzadeh

Department of Mechanical Engineering, Texas A&M University, 3123 TAMU, College Station, TX 77843
hzirak@tamu.edu

Je-Chin Han

Department of Mechanical Engineering, Texas A&M University, 3123 TAMU, College Station, TX 77843
jc-han@tamu.edu

Luzeng Zhang

Solar Turbines Incorporated, 2200 Pacific Highway, San Diego, CA, 92186
zhang_luzeng_j@solarturbines.com

Hee Koo Moon

Solar Turbines Incorporated, 2200 Pacific Highway, San Diego, CA, 92186
heekoomoon@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4037584 History: Received August 03, 2015; Revised June 19, 2017

Abstract

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°.

Solar Turbines Incorporated
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