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Research on Cooling Uniformity Based on Image Analysis Method

[+] Author Affiliations
Hong Wu, Deng Wen Yang

Beijing University of Aeronautics and Astronautics, Beijing, China

Paper No. GT2017-63949, pp. V05BT22A010; 9 pages
doi:10.1115/GT2017-63949
From:
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 5B: Heat Transfer
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5088-6
  • Copyright © 2017 by ASME

abstract

Cooling uniformity is of crucial importance for the cooling structure design of turbine vane and rotor blade. However, there exist no veritable quantification of the uniformity. This paper, for the first time, reveals the correlation between temperature distribution uniformities of the temperature image and its textural features, and five texture measures are employed to characterize these features and quantify the temperature distribution uniformity from different angles. Finally, their linear weighted combinations are proposed to obtain a comprehensive evaluation, and thus a systematic and quantitative methodology for cooling uniformity evaluation is established. Moreover, this method is exemplified through a flat-plate jet array impingement cooling model, where cooling uniformities over the impingement target surface under five cases are compared. Results show that both the cooling uniformity sequence and the relative changes of the uniformity composite index between the ranking agree well with those of the corresponding thermal stress analyses. This method shows a promising application in the design and optimization of cooling structures for gas turbine hot components, such as film cooling and impingement cooling.

Copyright © 2017 by ASME
Topics: Cooling

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