Numerical Investigation of Film Cooling Effectiveness and Flow Field Characteristics over a Flat Plate with in-Hole Swirl Generator | ||||
JES. Journal of Engineering Sciences | ||||
Article 4, Volume 51, Issue 6, November and December 2023, Page 53-80 PDF (1.81 MB) | ||||
Document Type: Research Paper | ||||
DOI: 10.21608/jesaun.2023.221981.1244 | ||||
View on SCiNiTO | ||||
Authors | ||||
Ahmed Ibrahim 1; Othman Hassan2; Mohamed El-Dosoky3; Moahmed Abdelghany1 | ||||
1Department of Mechanical Engineering, Assiut University, 71516 Assiut, Egypt | ||||
2Mechanical Engineering Department, Assiut University, 71516 Assiut, Egypt. | ||||
3a. Department of Mechanical Engineering, Assiut University, 71516 Assiut, Egypt b. College of Engineering, Fahad Bin Sultan University, P.O.B.15700, Tabuk 71454 KSA | ||||
Abstract | ||||
The performance of a new film cooling scheme has been numerically investigated. The scheme consists of a blade-type swirl generator that adds a swirl pattern to the injected coolant stream. Reynolds-Averaged Navier-Stokes equations along with a realizable k-ε turbulence model have been solved. The film cooling effectiveness over a flat plate downstream the coolant injection hole was determined for different generator geometric parameters and operating conditions. These parameters are the generator length to the injection hole diameter ratio, twist angle, and location from the hole inlet. The operating conditions are four different blowing ratios, constant density ratio of 2.0, mainstream turbulence intensity of 5% and Reynolds number of 80,000 based on the hole diameter and mainstream velocity. The results showed an enhancement in the laterally averaged cooling effectiveness accompanied by enriched jet spreading downstream the in-hole swirl generator, while the area-averaged cooling effectiveness increased by 74%, 293%, and 805% at blowing ratios 1.0, 1.5 and 2.0, respectively, compared to that for a scheme without swirl generator. Such enhancement is attributed to the vortical structure generated and hence the interaction with the mainstream. Optimization was carried out on obtained results to determine the optimal swirl generator geometric parameters. | ||||
Keywords | ||||
Film Cooling; Swirling Coolant Flow; CRVP; Vortex Reconstruction; Blade-type Swirl Generator | ||||
References | ||||
1. Acharya S, Kanani Y (2017) Chapter Three - Advances in Film Cooling Heat Transfer. In: Sparrow EM, Abraham JP, Gorman JM (eds) Advances in Heat Transfer Elsevier, pp. 91-156. 2. Goldstein RJ (1971) Film Cooling. In: Irvine TF, Hartnett JP (eds) Advances in Heat Transfer Elsevier, pp. 321-379. 3. Bunker RS (2005) A Review of Shaped Hole Turbine Film-Cooling Technology. Journal of Heat Transfer 127: 441-453 DOI 10.1115/1.1860562 4. Bogard DG, Thole KA (2006) Gas Turbine Film Cooling. Journal of Propulsion and Power 22: 249-270 DOI 10.2514/1.18034 5. Leylek JH, Zerkle RD (1994) Discrete-Jet Film Cooling: A Comparison of Computational Results With Experiments. Journal of Turbomachinery 116: 358-368 DOI 10.1115/1.2929422 6. Fric TF, Roshko A (2006) Vortical structure in the wake of a transverse jet. Journal of Fluid Mechanics 279: 1-47 DOI 10.1017/S0022112094003800 7. Haven BA, Kurosaka M (1997) Kidney and anti-kidney vortices in crossflow jets. Journal of Fluid Mechanics 352: 27-64 DOI 10.1017/S0022112097007271 8. Kusterer K, Bohn D, Sugimoto T, Tanaka R (2006) Double-Jet Ejection of Cooling Air for Improved Film Cooling. Journal of Turbomachinery 129: 809-815 DOI 10.1115/1.2720508 9. Heidmann JD, Ekkad S (2008) A Novel Antivortex Turbine Film-Cooling Hole Concept. Journal of Turbomachinery 130 DOI 10.1115/1.2777194 10. Dhungel A, Lu Y, Phillips W, Ekkad SV, Heidmann J (2009) Film Cooling From a Row of Holes Supplemented With Antivortex Holes. Journal of Turbomachinery 131 DOI 10.1115/1.2950059 11. Ely MJ, Jubran BA (2009) A numerical evaluation on the effect of sister holes on film cooling effectiveness and the surrounding flow field. Heat and Mass Transfer 45: 1435-1446 DOI 10.1007/s00231-009-0523-8 12. Ely MJ, Jubran BA (2009) A Numerical Study on Improving Large Angle Film Cooling Performance through the Use of Sister Holes. Numerical Heat Transfer, Part A: Applications 55: 634-653 DOI 10.1080/10407780902821532 13. Ming Li H, Hassan I (2015) The Effects of Counterrotating Vortex Pair Intensity on Film-Cooling Effectiveness. Heat Transfer Engineering 36: 1360-1370 DOI 10.1080/01457632.2015.1003715 14. Kuya Y, Nuntadusit C, Ishida H, Momose K, Kimoto H (2004) An Application of Swirling Jet to Film CoolingThe Proceedings of the Thermal Engineering Conference, pp. 283-284. 15. Takeishi K, Oda Y, Egawa Y, Kitamura T (2010) Film cooling with swirling coolant flowWIT Transactions on Engineering Sciences, pp. 189-200. 16. Oda Y, Takeishi K, Shimizu D (2011) Large eddy simulation of film cooling with swirling coolant flowASME/JSME 2011 8th Thermal Engineering Joint Conference, AJTEC 2011 American Society of Mechanical Engineers. 17. Yang W, Pu J, Wang J (2015) Combination effects of upstream-ramp and swirling coolant flow on film cooling characteristicsProceedings of the ASME Turbo Expo American Society of Mechanical Engineers (ASME). 18. Yang X, Liu Z, Liu Z, Feng Z (2015) Numerical analysis on effects of coolant swirling motion on film cooling performance. Int J Heat Mass Transf 90: 1082-1089 DOI 10.1016/j.ijheatmasstransfer.2015.07.055 19. Thurman D, Poinsatte P, Ameri A, Culley D, Raghu S, Shyam V (2016) Investigation of spiral and sweeping holes. Journal of Turbomachinery 138: 091007 DOI 10.1115/1.4032839 20. Yue G, Dong P, Jiang Y, Gao J, Zheng Q (2017) Research on film cooling mechanism of vortex reconstruction induced by swirling coolant flowProceedings of the ASME Turbo Expo American Society of Mechanical Engineers (ASME). 21. Jia Y, Liu Y, Meng Z, Yin W, Hua W (2023) Numerical study on film cooling effectiveness from spiral-channel hole. International Communications in Heat and Mass Transfer 143: 106716 DOI https://doi.org/10.1016/j.icheatmasstransfer.2023.106716 22. Ansys®Fluent., Release16.0. (2015) Theory Guide ANSYS, Inc., Canonsburg, PA. 23. Zhang XZ, Hassan I (2006) Film cooling effectiveness of an advanced-louver cooling scheme for gas turbines. J Thermophys Heat Transfer 20: 754-763 DOI 10.2514/1.18898 24. Pedersen DR, Eckert ERG, Goldstein RJ (1977) Film cooling with large density differences between the mainstream and the secondary fluid measured by the heat-mass transfer analogy. Journal of Heat Transfer 99: 620-627 DOI 10.1115/1.3450752 25. Tan CS, Greitzer EM, Graf MB (2004) Swirling flow. In: Tan CS, Greitzer EM, Graf MB (eds) Internal Flow: Concepts and Applications Cambridge University Press, Cambridge, pp. 389-445. 26. Shevchuk IV (2016) Overview of Rotating Flows. In: Shevchuk IV (ed) Modelling of Convective Heat and Mass Transfer in Rotating Flows Springer International Publishing, Cham, pp. 1-9. 27. Javadi K (2018) Introducing Film Cooling Uniformity Coefficient. Heat Transfer Engineering 39: 180-193 DOI 10.1080/01457632.2017.1288056 28. Hay N, Lampard D (1998) Discharge Coefficient of Turbine Cooling Holes: A Review. Journal of Turbomachinery 120: 314-319 DOI 10.1115/1.2841408 | ||||
Statistics Article View: 155 PDF Download: 749 |
||||