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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2013, Vol. 34 ›› Issue (1): 46-51.doi: 10.7527/S1000-6893.2013.0006

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Analysis of Turbine Blade Cooling Effectiveness

DING Yang, CHANG Haiping   

  1. College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2012-02-14 Revised:2012-06-01 Online:2013-01-25 Published:2013-01-19
  • Supported by:

    Ministry-level Project

Abstract:

In order to figure out how internal heat exchange efficiency and film cooling effectiveness influence the overall cooling effectiveness, a simplified physical model has been built to analyze factors that influence turbine blade overall cooling effectiveness. Several conclusions are drawn as follows. Under low relative heat load, the overall cooling effectiveness rises as the internal heat exchange efficiency improves, which indicates that the internal heat exchange efficiency has a strong positive effect on the overall cooling effectiveness. Under high relative heat load, film cooling effectiveness has a stronger effect on overall cooling effectiveness, while the influence of internal heat exchange efficiency decreases. As internal heat exchange efficiency increases, excessive heat load makes overall cooling effectiveness decrease, which leads to the failure of internal cooling.

Key words: turbine, cooling, overall cooling effectiveness, relative heat load, heat exchange efficiency, film cooling effectiveness

CLC Number: