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Introducing film cooling uniformity coefficient (CUC)

Javadi, K ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1115/IMECE2008-68502
  3. Publisher: 2009
  4. Abstract:
  5. A well performance film cooling implies for a high cooling effectives accompanied with a wide cooling coverage. During the past six decades, film cooling effectiveness has been well defined with a specific relation to quantify it. However, despite of numerous film cooling research, there is not an explicit method to quantify the uniformity of a coolant film spread over the hot surfaces. This work introduces a cooling uniformity coefficient (CUC) to evaluate how well a coolant film spreads over a surface being cooled. Four different cases are computationally studied. In the three cases, a single jet is injected into a hot cross flow with different jet exit shapes (i.e. square, spanwise rectangular, and streamwise rectangular). The fourth case is a novel combined triple jet (CTJ) introduced in our previous work. The cross sections of all the systems are equal to maintain the same coolant mass flow rate injection into the hot cross flow. The CUCs of the different cases are compared with each other at two blowing ratios of 0.5 and 1.5. It is proposed that in addition to the film cooling effectiveness, the CUC is a necessary parameter to evaluate how well a coolant film is spread over a hot surface. Copyright © 2008 by ASME
  6. Keywords:
  7. Blowing ratio ; Cooling uniformity ; Cross flows ; Cross section ; Explicit method ; Film cooling ; Film cooling effectiveness ; Hot surface ; Mass flow rate ; Single jet ; Well performance ; Coolants ; Jets ; Mechanical engineering ; Quenching ; Cooling
  8. Source: 2008 ASME International Mechanical Engineering Congress and Exposition, IMECE 2008, Boston, MA, 31 October 2008 through 6 November 2008 ; Volume 10, Issue PART B , 2009 , Pages 1193-1211 ; 9780791848715 (ISBN)
  9. URL: https://www.tandfonline.com/doi/abs/10.1080/01457632.2017.1288056?src=recsys&journalCode=uhte20