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Investigations into film cooling and unsteady flow characteristics in a blade trailing-edge cutback region

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Abstract

Unsteady flow characteristic and film cooling effect in the blade trailing edge cutback region are numerically investigated using DES (detached eddy simulation) method at three blowing ratios, four lip thickness ratios and three rib geometries. With the experimental data, reliability and accuracy of the numerical methods are validated. The results indicate that, compared with RANS (Reynolds-averaged Navier-Stokes) equations solutions, the DES method has a superior accuracy in predicting the film cooling effectiveness on trailing-edge cutback. The lip thickness has a pronounced effect on shedding vortex scale downstream the slot. As the lip thickness ratio decreases, the film cooling effect on trailing edge cutback is improved. Compared with the line ribs, the arrangement of pin fin ribs enhances the uniformity of coolant coverage on trailing edge cutback along lateral direction. However, with different types of rib, the film cooling effectiveness on the trailing edge cutback is mainly determined by the stable cooling flow structures and mixing effect between mainstream and coolant. The development of vortex system downstream the slot is significantly affected by the blowing ratio, which in turn influences the film cooling effect on trailing edge cutback.

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Authors and Affiliations

  1. Institute of Turbomachinery, Xi’an Jiaotong University, Xi’an, 710049, China

    Yan Gao, Xin Yan & Jun Li

  2. MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

    Kun He

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  1. Yan Gao
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  2. Xin Yan
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  3. Jun Li
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  4. Kun He
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Correspondence to Xin Yan.

Additional information

Recommended by Associate Editor Seong Hyuk Lee

Yan Gao is a Ph.D. candidate of Institute of Turbomachinery, Xi’an Jiaotong University. His research interests include turbomachinery aerodynamics and film cooling technology of gas turbine.

Xin Yan is a Professor at Institute of Turbomachinery, Xi’an Jiaotong University. His main research interest has been in Computational Fluid Dynamics with emphasis in turbomachinery aerodynamics and heat transfer. He is also involved in experimental work to understand complex flow physics.

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Gao, Y., Yan, X., Li, J. et al. Investigations into film cooling and unsteady flow characteristics in a blade trailing-edge cutback region. J Mech Sci Technol 32, 5015–5029 (2018). https://doi.org/10.1007/s12206-018-0949-3

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  • DOI: https://doi.org/10.1007/s12206-018-0949-3

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