Computational Analysis of Impingement Cooling with Enhancement Features

About the authors:

Andrey A. Sedlov, Post-Graduate Student, Department of Gas Turbine and Nonconventional Power Plants, Bauman Moscow State Technical University; andrey.sedlov@yahoo.com

Igor N. Baybuzenko, Postgraduate Student, Department “Gas Turbine and Renewable Power Plants”, Bauman Moscow State Technical University; igor.baibuzenko@gmail.com

Vadim L. Ivanov, Cand. Sci. (Tech), Associate Professor, Department “Gas Turbine and Renewable Power Plants”, Bauman Moscow State Technical University; vadimlivanov@yandex.ru

Abstract:

CFD analysis for heat transfer and pressure losses was performed for various impingement enchantment features: cylindrical, prismatic (diamond and drop section) pins in the wide range of geometric parameters and Reynolds numbers from 10⁴ up to 3·10⁴. Unlike typical ambient experimental conditions, the current study performs the analysis for the conditions applicable for gas turbine engine in the coupled setting (air-intensifiers). This allowed considering the effect of increased heat transfer surface and summarizing the obtained results.

CFD modelling was performed using commercial code ANSYS Fluent 14.0, based on finite volume approach for solving the gas dynamic and heat transfer equations. The system of equations including Navier–Stokes equation, energy and continuity equations and Reynolds averaged was calculated for steady state conditions accounting for compressibility and non-isothermality of the flow.

Realizable k-ε turbulence model combined with Wolfstein model for the near wall layer was chosen for the calculations based on conducted validation according to criterial correlations for the main equation system locking.

The conducted analysis showed the possibility for heat transfer enhancement by 100-150% for mid row holes, while the general intensification level for the 10 studied rows consisted by 50%, if normalized by flat impingent surface. The installation of high blockage features with D/d > 1.0 allows to prevent the running flow from the negative impact of the cross flow and at the same time to increase the heat transfer area, what leads to the increase of cooling efficiency.

The installation of high blockage features causes also significant redistributions of the heat transfer intensity along the impingement surface, leading to the first rows intensity being decreased by up to 30%. It may lead to the local overheating, so it should be considered in the projection of highly loaded cooled turbine parts.

References:

1. Abubakar M. E.-J. et al. 2016. “Impingement Jet Cooling with Ribs and Pin Fin Obstacles in Co-Flow Configurations: Conjugate Heat Transfer Computational Fluid Dynamic Predictions”. ASME Turbo Expo 2016, ASME Paper GT2016-57021.
2. Andrews G. E. et al. 2003. “Enhanced Impingement Heat Transfer: Comparison of Co-Flow and Cross-Flow with Rib Turbulators”. Proceedings of IGTC2003 Tokyo TS-074, 8th International Gas Turbine Congress Tokyo, November 2-7.
3. Annerfeldt M. O. et al. 2001. “Experimental Investigation of Impingement Cooling with Turbulators or Surface Enlarging Elements”. ASME paper 2001-GT-0149.
4. Barata J. M. M. 1996. “Fountain Flows Produced by Multiple Impinging Jets in a Crossflow”. AIAA Journal, no 34(12), pp. 2523-2530.
5. Behnia M., Parneix S., Durbin P. 1997. “Accurate Modeling of Impingement Jet Heat Transfer”. In: Annual Research Briefs. Center for Turbulence Research.
6. Bouchez J. P., Goldstein R. J. 1975. “Impingement Cooling From a Circular Jet in a Cross Flow”. International Journal of Heat and Mass Transfer, no 18, pp. 719-730.
7. Buchlin J. M. 2000. “Convective Heat Transfer in Impinging-Gas-Jet Systems”. In: von Karman Institute for Fluid Dynamics Lecture Series, 2000-03, pp.1-33.
8. Chang H. et al. 1998. “Experimental Investigation on Impingement Heat Transfer from Rib Roughened Surface within Arrays of Circular Jet: Effect of Geometric Parameters”. Proceedings of ASME Turbo Expo 98, ASME Paper 98-GT-208.
9. Chang S. W. et al. “Heat Transfer of Impinging Jet-array over Convex Dimpled Surface with Application to Cooling of Combustion Chamber of gas turbine Engine”. Proceedings of National Kaohsiung Marine University. http://mail.nkmu.edu.tw
10. Colucci D., Viskanta R. 1996. “Effect of Nozzle Geometry on Local Convective Heat Transfer to a Confined Impinging Air Jet”. Experimental Thermal and Fluid Science, no 13, pp. 71-80. DOI: 10.1016/0894-1777(96)00015-5
11. Craft T., Iacovides H., Graham L., Launder B. 1993. “Impinging Jet Studies for Turbulent Model Assessment-2. An Examination of the Performance of Four Turbulence Models”. International Journal of Heat and Mass Transfer, no 36(10), pp. 2685-2697.
12. Ekkard S. V., Kontrovitz D. 2002. “Jet Impingement Heat Transfer on Dimpled Target Surfaces”. International Journal of Heat and Fluid Flow, no 23, pp. 22-28. DOI: 10.1016/S0142-727X(01)00139-4
13. Florschuetz L. W., Truman C. R., Metzger D. E. 1981. “Streamwise Flow and Heat Transfer Distributions for Jet Array Impingement with Crossflow”. Journal of Heat Transfer, no 103, pp. 337-342. DOI: 10.1115/1.3244463
14. Gao N., Sun H., Ewing D. 2003. “Heat Transfer to Impinging Round Jets with Triangular Tabs”. International Journal of Heat and Mass Transfer, no 46, pp. 2557-2569. DOI: 10.1016/S0017-9310(03)00034-6
15. Goldstein R. J., Behbahani A. I. 1982. “Impingement of a Circular Jet with and without Cross Flow”. International Journal of Heat and Mass Transfer, no 25, pp. 1377-1382. DOI: 10.1016/0017-9310(82)90131-4
16. Han B., Goldstein R. 2000. “Aero-Thermal Performance of Internal Cooling Systems in Turbomachines”. In: von Karman Institute for Fluid Dynamics Lecture Series, 2000-03, pp. 1-57.
17. Han B., Goldstein R. J. 2001. “Jet-Impingement Heat Transfer in Gas Turbine Systems”. Annals of the New-York Academy of Science, no 934(1), pp. 147-161.
18. Hofman H. M., Kaiser R., Kind M., Martin H. 2007. “Calculations of Steady and Pulsating Impinging Jets — An Assessment of 13 Widely used Turbulence Models”. Numerical Heat Transfer, Part B: Fundamentals, no 51(6), pp. 565-583.
19. Hoglund H. 1999. “Experimental Investigation of Impingement Cooling Under a Staggered Array of Circular Jets”. Thesis Work at the Department of Energy Technology Royal Institute of Technology, KTH.
20. Katti V., Prabhu S. 2008. “Experimental Study and Theoretical Analysis of Local Heat Transfer Distribution Between Smooth Flat Surface and Impinging Air Jet from a Circular Straight Pipe Nozzle”. International Journal of Heat and Mass Transfer, no 51(17-18), pp. 4480-4495.
21. Kercher D. M., Tabakoff W. 1970. “Heat Transfer by a Square Array of Round Air Jets Impinging Perpendicular to a Flat Surface Including the Effect of Spent Air”. ASME Journal of Engineering for Power, no 92, pp. 73-82.
22. Knowles K., Bray D. 1993. “Ground Vortex Formed by Impinging Jets in Cross Flow”. Journal of Aircraft, no 30(6), pp. 872-878. 
23. Lee J., Lee S. 1999. “Stagnation Region Heat Transfer of a Turbulent Axisymmetric Jet Impingement”. Experimental Heat Transfer, no 12(2), pp. 137-156.
24. Lee D. H., Won S. Y., Kim Y. T., Chung Y. S. 2002. “Turbulent Heat Transfer from a Flat Surface to a Swirling Round Impinging Jet”. International Journal of Heat and Mass Transfer, no 45, pp. 223-227. DOI: 10.1016/S0017-9310(01)00135-1
25. Lytle D., Webb B. W. 1994. “Air Jet Impingement Heat Transfer at Low Nozzle Plate Spacings”. International Journal of Heat and Mass Transfer, no 37, pp. 1687–1697. DOI: 10.1016/0017-9310(94)90059-0
26. Metzger D. E., Korstad R. J. 1972. “Effects of Crossflow on Impingement Heat Transfer”. Journal of Engineering for Power, no 94, pp. 35-42. DOI: 10.1115/1.3445616
27. Mhetras S. et al. 2013. “Impingement Heat Transfer from Jet Arrays on Turbulated Target Walls at Large Reynolds Numbers”. Proceedings of ASME Turbo Expo: Power for Land and Sea, June 3-7, San Antonio, Texas, USA.
28. Obot N. T., Trabold T. A. 1987. “Impingement Heat Transfer within Arrays of Circular Jets: Part 1 — Effects of Minimum, Intermediate, and Complete Crossflow for Small and Large Spacings”. Journal of Heat Transfer, no 109, pp. 872-879. DOI: 10.1115/1.3248197
29. Sedlov A. A., Ivanov V. L. 2012. “Chislennoe modelirovanie protsessov gazodinamiki i teploobmena pri struynom natekanii na poverkhnost'” [Computational Analysis of Gas Dynamics and Heat Transfer for Impingement Cooling]. Izvestiya vysshikh uchebnykh zavedeniy. Aviatsionnaya tekhnika, no 4, pp. 75-78.
30. Son C. et al. 2005. “An Investigation of the Application of Roughness Elements to Enhance Heat Transfer in an Impingement Cooling System”. Proceedings of ASME Turbo Expo: Power for Land and Sea. June 6-9, Reno-Tahoe, Nevada, USA.
31. Spring S., Weigand B., 2010. “Jet Impingement Heat Transfer”. In: VKI Lecture Series.
32. Spring S., Weigand B., Krebs W., Hase M. 2006. “CFD Heat Transfer Predictions of a Single Circular Jet Impinging with Crossflow”. Proceeding of 9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference, San Francisco, California, USA, AIAA, pp. 2006-3589.
33. Trabold T. A., Obot N. T. 1987. “Impingement Heat Transfer within Arrays of Circular Jets: Part 2 — Effects of Crossflow in the Presence of Roughness Elements”. Journal of Turbomachinery, no 109(4), pp. 594-601. DOI: 10.1115/1.3262153
34. Wan C. et al. 2013. “Numerical Investigation of Impingement Heat Transfer on a Flat and Square Pin-Fin Roughened Plates”. Proceedings of ASME Turbo Expo: Power for Land and Sea, June 3-7, San Antonio, Texas, USA.
35. Yan X., Saniel N. 1998. “Heat Transfer Measurements from a Flat Plate to a Swirling Impinging Jets”. Proceedings of 11th International Heat Transfer Conference, Kvonju, Korea.
36. Yudaev B. N. 1988. Tekhnicheskaya termodinamika. Teploperedacha: Ucheb. dlya neenergetich. spets. vtuzov [Technical Thermodynamics. Heatransfer: Students Handbook]. Moscow: Visshaya Shkola.