A novel method for designing fan-shaped holes with short length-to-diameter ratio in producing high film cooling performance for thin-wall turbine airfoil

Li, W., Li, X., Ren, J. and Jiang, H. (2018) A novel method for designing fan-shaped holes with short length-to-diameter ratio in producing high film cooling performance for thin-wall turbine airfoil. Journal of Turbomachinery, 140(9), 091004. (doi: 10.1115/1.4041035)

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Abstract

An experimental investigation of the geometrical parameter effects on the film cooling performance of a fan-shaped hole was conducted on a low speed flat-plate facility. The pressure sensitive paint (PSP) technique and steady liquid crystal (SLC) technique were employed to determine the adiabatic film cooling effectiveness and heat transfer coefficients, respectively, for a blowing ratio ranging from 0.3 to 3 and a density ratio of DR = 1.5. Several geometrical parameters were investigated, including lateral expansion angle, length-to-diameter ratio, and hole entrance shape. Local, laterally averaged, and area-averaged adiabatic film cooling effectiveness, heat transfer coefficients, and net heat flux reduction (NHFR) were shown to provide a comprehensive understanding on the geometrical parameter effects on the thermal performance. A novel method was proposed for designing a fan-shaped hole with short length-to-diameter ratio to design to achieve high film cooling performance. The original and optimized fan-shaped holes were compared in terms of adiabatic film cooling effectiveness, heat transfer coefficients, and NHFR. Results showed that the optimized fan-shaped hole with short length-to-diameter ratio, large lateral diffusion angle, and slot hole entrance shape obtained highest overall thermal performance. It demonstrated the feasibility of adopting the proposed design method to design fan-shaped holes applied in thin wall gas turbine blades.

Item Type:Articles
Additional Information:Funding: National Natural Science Foundation of China (Grant No. 51676106).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Li, Mr Weihong
Authors: Li, W., Li, X., Ren, J., and Jiang, H.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Journal of Turbomachinery
Publisher:American Society of Mechanical Engineers
ISSN:0889-504X
ISSN (Online):1528-8900
Published Online:28 August 2018

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