Combination Of Ribs And Pins For Internal Cooling

Abstract

This paper describes an experimental investigation into the effect of simultaneous implementation of pins and ribs for internal duct cooling in gas turbine blade applications. Thermochromatic liquid crystal thermography was used to evaluate heat transfer coefficients and Nußelt number at the endwall for each possible combination of three pin blockage ratios. Low, medium and high blockage ratios, relative rib heights between 0% and 10% channel height and three different Reynold’s numbers were examined. In addition, pressure drop data was collected to calculate the thermal performance factor, describing the tradeoff between cooling effectiveness and loss in total pressure. The channel geometries used deviate from common rectangular channels. In order to more closely describe internal duct geometries, a triangular shaped channel and a channel with a circular sidewall was used in this experiment. As a compliment to the experimental work, a CFD study was also performed to further explore some of the more detailed aspects of the experimental cases tested. This was done in an effort to build an accurate model for more elaborate simulations in the future. The numerical effort involves a total of six different rib height and blockage combinations, at one particular Reynold’s number.

Publication Date

1-1-2015

Publication Title

51st AIAA/SAE/ASEE Joint Propulsion Conference

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.2514/6.2015-3735

Socpus ID

85086951366 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85086951366

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