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Experimental and numerical investigation of heat transfer characteristics in a square channel with various truncated ribs

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Abstract

Oblique ribs are widely applied to the internal cooling of turbine blades to promote the heat transfer between blade wall and coolant. In this study, the effect of several new types of truncated ribs on the heat transfer characteristics in 45° oblique rib channels is investigated experimentally and numerically. The numerical results obtained by the SST k-ω turbulence model agree well with the experimental data for the Reynolds number ranging from 10000 to 60000. The results indicate a significant entrance effect on the heat transfer in truncated rib channels. The numerical results show that ribs continuously truncated at 3.8 mm gives the best heat transfer performance among the newly truncated ribs. Compared with the original structure, the Nusselt number and heat transfer enhancement factor of newly truncated ribs increased by 24.6 % and 17.8 %, respectively. Concurrently, the friction factor is reduced by 5.1 %.

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Acknowledgments

This work is financially supported by the National Natural Science Foundation of China (Nos. 51776149 and 51109174), which is gratefully acknowledged.

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Authors and Affiliations

  1. MOE Key Laboratory of Thermo-Fluid Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

    Jianying Gong & Weifeng Wu

  2. Institute of Turbomachinery, School of Energy and Power Engineering, Xi’an, 710049, China

    Xiong Zhang, Junxiong Zeng & Tieyu Gao

Authors
  1. Jianying Gong
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  2. Xiong Zhang
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  3. Junxiong Zeng
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  4. Tieyu Gao
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  5. Weifeng Wu
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Corresponding author

Correspondence to Tieyu Gao.

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Recommended by Associate Editor Jaeseon Lee

Tieyu Gao, PhD, was born in 1973 in China. He currently works in Xi’an Jiaotong University. His major research includes two-phase flow in turbomachinery and the air and steam cooling technology of the gas turbine.

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Gong, J., Zhang, X., Zeng, J. et al. Experimental and numerical investigation of heat transfer characteristics in a square channel with various truncated ribs. J Mech Sci Technol 33, 4029–4038 (2019). https://doi.org/10.1007/s12206-019-0748-5

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  • DOI: https://doi.org/10.1007/s12206-019-0748-5

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