THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

Lei Xi

,

Qicheng Ruan

,

Yuan Gao

,

Jianmin Gao

,

Liang Xu

,

Yunlong Li

online first only

Study on flow and heat transfer performance of single jet impingement cooling through variable-diameter hole

ABSTRACT
In this work, the heat transfer and flow characteristics of single jet impinging cooling with three types of hole configurations, namely converging hole, straight hole, and expanded hole, were compared and analyzed numerically. The influence laws of Reynolds number, outlet-to-inlet diameter ratio, and impinging height ratio on the heat transfer, flow, and comprehensive thermal performance of the converging-hole impinging cooling were intensively investigated. Finally, the empirical correlations were fitted and the sensitivity of performance variables to influencing parameters were analyzed for the converging-hole impinging cooling. The results show that the converging hole exhibits the superlative heat transfer performance but the poorest flow performance. The expanded hole exhibits the poorest heat transfer performance but the superlative flow performance. As Re>24,000, the comprehensive thermal performance of the three types of hole configurations is similar. For the converging-hole impinging cooling, when Re increases from 6,000 to 30,000 under various structural parameters, the average Nusselt number increases by approximately 1.62 to 2.65 times, and the comprehensive thermal coefficient increases by approximately 1.58 to 2.45 times. As the outlet-to-inlet diameter ratio increases from 0.5 to 0.9 under various Re, the pressure loss coefficient of the converging-hole impinging cooling decreases by approximately 91.47% to 92.95%, and the corresponding average Nusselt number decreases by 43.61% to 60.07%. When the impinging height ratio is 2.0, the converging-hole impinging cooling exhibits lower pressure loss coefficients. The parameter sensitivity analysis shows that the average Nusselt number of converging-hole impinging cooling is sensitive to changes in the outlet-to-inlet diameter ratio and Reynolds number, but insensitive to changes in the impinging height ratio. The pressure loss coefficient is highly sensitive to changes in the outlet-to-inlet diameter ratio, but insensitive to changes in the Reynolds number and impinging height ratio. The comprehensive thermal coefficient is highly sensitive to changes in the Reynolds number, but insensitive to changes in the outlet-to-inlet diameter ratio and impinging height ratio.
KEYWORDS
impinging cooling, single jet, variable-diameter hole, flow performance, heat transfer performance
PAPER SUBMITTED: 2024-01-09
PAPER REVISED: 2024-03-20
PAPER ACCEPTED: 2024-03-29
PUBLISHED ONLINE: 2024-05-18
DOI REFERENCE: https://doi.org/10.2298/TSCI240109116X
REFERENCES
  1. Yang, J., et al., Numerical Simulations and Optimizations for Turbine-Related Configurations, Therm. Sci., 24 (2020), 1, pp. 367-378
  2. Xi, L., et al., Study on Flow and Heat Transfer Characteristics of Cooling Channel Filled with X-Shaped Truss Array, Therm. Sci., 27 (2023), pp. 739-754
  3. Xi, L., et al., Numerical investigation and parameter sensitivity analysis on flow and heat transfer performance of jet array impingement cooling in a quasi-leading-edge channel, Aerospace, 9 (2022), 87
  4. Wu, W., et al., Leading edge impingement cooling analysis with separators of a real gas turbine blade, Appl. Therm. Eng., 208 (2022), pp. 118275
  5. Fan, X., et al., Cooling Methods for Gas Turbine Blade Leading Edge: Comparative Study on Impingement Cooling, Vortex Cooling and Double Vortex Cooling, Int. Commun. Heat Mass, 100 (2019), pp. 133-145
  6. Forster, M., et al., Experimental and Numerical Investigation of Jet Impingement Cooling onto a Concave Leading Edge of a Generic Gas Turbine Blade, Int. J. Therm. Sci., 164 (2021), pp. 106862
  7. Ekkad, S.V., et al., A Modern Review on Jet Impingement Heat Transfer Methods, J. Heat Trans-T Asme, 143 (2021), pp. 064001
  8. Liu, K., et al., A novel multi-stage impingement cooling scheme—Part ii: Design optimization, J Turbomach, 142 (2020), pp. 121009
  9. Xu, L., et al., Numerical simulation of swirling impinging jet issuing from a threaded hole under inclined condition, Entropy, 22 (2019), pp. 15
  10. Oliveira, A.V.S., et al., Experimental study of the heat transfer of single-jet impingement cooling onto a large heated plate near industrial conditions, Int. J. Heat Mass Trans., 184 (2022), pp. 121998
  11. Salem, A.R., et al., Experimental and numerical study of jet impingement cooling for improved gas turbine blade internal cooling with in-line and staggered nozzle arrays, J Energ Resour-Asme, 143 (2021), pp. 012103
  12. Plant, R.D., et al., A Review of Jet Impingement Cooling, International Journal of Thermofluids, 17 (2023), pp. 100312
  13. Pawar, S., et al., The impingement heat transfer data of inclined jet in cooling applications: a review, J Therm Sci, 29 (2020), pp. 1-12
  14. Singh, P., et al., Study of flow field and heat transfer characteristics for an interacting pair of counter-rotating dual-swirling impinging flames, Int. J. Therm. Sci., 144 (2019), pp. 191-211
  15. Yang, T., et al., Comparative study on flow and heat transfer characteristics of swirling impingement jet issuing from different nozzles, Int. J. Therm. Sci., 184 (2023), pp. 107914
  16. Nourin, F.N., et al., Review of gas turbine internal cooling improvement technology, J Energ Resour-Asme, 143 (2021), pp. 080801
  17. Tepe, A Ü., et al., Experimental and numerical investigation of jet impingement cooling using extended jet holes, Int. J. Heat Mass Trans., 158 (2020), pp. 119945
  18. Zhou, J., et al., Numerical investigation on flow and heat transfer characteristics of single row jet impingement cooling with varying jet diameter, Int. J. Therm. Sci., 179 (2022), pp. 107710
  19. Marzec, K., et al., Heat transfer characteristic of an impingement cooling system with different nozzle geometry, Journal of Physics: Conference Series. IOP Publishing, 530 (2014), pp. 012038
  20. Shuja, S.Z., et al., Jet impingement onto a tapered hole: influence of jet velocity and hole wall velocities on heat transfer and skin friction, Int j Numer Meth Fl, 60 (2009), pp. 972-991
  21. Carcasci, C., et al., Experimental Investigation of a Leading Edge Cooling System With Optimized Inclined Racetrack Holes, Turbo Expo: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 45714 (2014), pp. V05AT12A034
  22. Ram, C., et al., Computational study of leading edge jet impingement cooling with a conical converging hole for blade cooling, ARPN J. Eng. Appl. Sci, 12 (2017), pp. 6397-6406
  23. Sivamani, S., et al., Numerical analysis of jet impingement cooling using converging conical hole for blade leading edge, Gas Turbine India Conference. American Society of Mechanical Engineers, 58509 (2017), pp. V001T03A009
  24. Sathish, S., et al., Influence of converging conical hole angles on jet impingement blade cooling of gas turbine blade leading edge, AIP Conference Proceedings 6 January 2022, 2385 (2022), pp. 120003
  25. Zielinski, A.J., et al., Impingement Cooling Using a Variable-Diameter Synthetic Jet, 17th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm). IEEE, 17 (2018), pp. 429-435
  26. Zielinski A.J., et al., Flow Analysis of the Impingement of a Variable-Diameter Synthetic Jet, J Flow Vis Image Pro, 26 (2019), 2, pp. 127-148
  27. Chi, Z., et al., Geometrical optimization of nonuniform impingement cooling structure with variable-diameter jet holes, Int. J. Heat Mass Trans., 108 (2017), pp. 549-560
  28. Xu, L., et al., Flow and heat transfer characteristics of a swirling impinging jet issuing from a threaded nozzle, Case Stud. Therm. Eng., 25 (2021), pp. 100970
  29. He, J., et al., Heat transfer enhancement of impingement cooling by different crossflow diverters, J. Heat Trans-T Asme, 144 (2022), 4, pp. 042001
PDF VERSION [DOWNLOAD]
Study on flow and heat transfer performance of single jet impingement cooling through variable-diameter hole