Rib Turbulator Heat Transfer Enhancements at Very High Reynolds Numbers

[+] Author and Article Information
Mingyang Zhang

635 Prices Fork Rd 445 Goodwin Hall Blacksburg, VA 24061 mingyz1@vt.edu

Prashant Singh

911 Oval Dr, Room 3002 Raleigh, NC 27695 psingh23@ncsu.edu

Srinath V. Ekkad

911 Oval Dr., 3002 EB III, Mech & Aerospace Engg Raleigh, NC 27695 sekkad@ncsu.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Thermal Science and Engineering Applications. Manuscript received June 27, 2018; final manuscript received April 2, 2019; published online xx xx, xxxx. Assoc. Editor: T.S. Ravigururajan.

ASME doi:10.1115/1.4043465 History: Received June 27, 2018; Accepted April 03, 2019


High-pressure stage gas turbine blades feature serpentine passages where rib turbulators are installed to enhance heat transfer between the relatively colder air bled-off from the compressor and the hot internal walls. Most of the prior studies have been restricted to Reynolds number of 90000 and several studies have been carried out to determine geometrically optimized parameters for achieving high levels of heat transfer in this range of Reynolds number. However, for land-based power generation gas turbines, the Reynolds numbers are significantly high and vary between 105 and 106. Present study is targeted towards these high Reynolds numbers where traditional rib turbulator shapes and prescribed optimum geometrical parameters have been investigated experimentally. A steady-state liquid crystal thermography technique is employed for measurement of detailed heat transfer coefficient. Five different rib configurations, viz., 45 deg., V-shaped, inverse V-shaped, W-shaped and M-shaped have been investigated for Reynolds numbers ranging from 150,000 to 400,000. The ribs were installed on two opposite walls of a straight duct with aspect ratio of unity. For very high Reynolds numbers, the heat transfer enhancement levels for different rib shapes varied between 1.4 and 1.7 and the thermal hydraulic performance was found to be less than unity.

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