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Experimental Investigation of Film Cooling with Horseshoe Type Coolant Jet Injection

Salehinejad, Mohammad Mahdi | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49337 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering Department
  6. Advisor(s): Javadi, Khodayar; Soltani, Mohammad Reza
  7. Abstract:
  8. Gas turbine efficiency will increase with rising the temperature of inlet gas. However, there are some restrictions for rising the temperature of inlet gas. Film cooling is one of the best methods to eliminate these limitations. The geometry of coolant jet hole is one of the most effective parameters in effectiveness and uniformity of film cooling. In this experimental investigation, the effects of five different coolant jet holes are evaluated. Blowing ratios of 0.5, 1 and 1.5 and density ratio of 1 were selected to perform this study. The five models for coolant hole are: square model, CTJ model, 3-circle model, semicircle horseshoe model and parabolic horseshoe model. The injection angle is 90 degrees for all cases and there is no compound angle. The temperature of eighty points on the plate are measured by an IR laser gun. Then, by the temperature information, film cooling effectiveness coefficient for center line, average film cooling effectiveness coefficient, film cooling uniformity coefficient and temperature contour are produced for each case. Boundary layer control, reduce mixing of cross flow with coolant flow and increase the uniformity are the purposes of introducing horseshoe configuration. Results indicated that CTJ model and 3-circle model have the high film cooling uniformity. It is because of secondary flows which are produced by the small holes in the models. Semicircle horseshoe model has a high film cooling effectiveness coefficient for center line. Also, parabolic horseshoe model has a very desirable film cooling uniformity coefficient and in the blowing ratio of 0.5 indicates the best film cooling performance and uniformity between of models
  9. Keywords:
  10. Film Cooling ; Effectivness ; Horseshoe Holes ; Effectiveness Coefficient ; Uniformity Coefficient

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