بررسی دقت مدل‏های زیرشبکه در مدل‏سازی آتش چرخان درونی توسط روش شبیه ‏سازی گردابه‏ های بزرگ

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه تربیت مدرس، دانشکده مهندسی مکانیک، گروه تبدیل انرژی

2 دانشگاه تربیت مدرس

چکیده

در این مقاله، آتش چرخشی با سوخت متانول در یک اتاق با ارتفاع زیاد، که یک شکاف در یک گوشه‏ آن ایجاد شده است، مورد بررسی قرار می‌گیرد. مدل‌سازی با استفاده از روش شبیه‏ سازی گردابه‏ های بزرگ، مدل زیرشبکه‏ اسماگورینسکی، ویل و تک­ معادله‏ای و مدل احتراقی اضمحلال گردابه انجام شده و نتایج در دو شرایط مختلف (بستر سوخت با قطر 5/8 و 7 سانتی‌متر) با نتایج تجربی مقایسه می‌شود. با مقایسه‏ نتایج عددی با نتایج تجربی مشاهده می‌شود که نتایج عددی دمای متوسط در وسط و گوشه‏ اتاق با نتایج تجربی همخوانی دارد. نتایج مدل ‏های مختلف زیرشبکه در خط مرکزی نشان می‌دهد که مدل وِیل با نتایج تجربی همخوانی بهتری دارد. همچنین عملکرد دو مدل زیرشبکه‏ تک­معادله‏ای و اسماگورینسکی بدتر از مدل ویل بوده است، به‌طوری ‌که به‌طور متوسط درصد خطای نسبی مدل وِیل ۳/۷ درصد است، درحالی ‌که هر یک از مدل‏ های اسماگورینسکی و تک ­معادله‌ای به ­ترتیب 8 و 8/9 درصد خطا نسبت­به نتایج تجربی دارند. در فواصل دور از مرکز نتایج سه مدل زیرشبکه تفاوت چندانی ندارد و همخوانی بیشتری با نتایج تجربی دیده می‌شود، به‌گونه‌ای که در گوشه‏ اتاق خطای نسبی کمتر از ۸ درصد است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Accuracy of Sub-grid Models in Internal Fire Whirl Modeling by Large Eddy Simulation

نویسندگان [English]

  • Mohammad Safarzadeh 1
  • Ghassem Heidarinejad 2
  • Hadi Pasdarshahri 2
1 Department of Energy Conversion, Faculty of Mechanical Engineering, Tarbiat Modares University
2 Tarbiat Modares University
چکیده [English]

In this paper, a fire whirl in a high-rise room with a gap in one corner is investigated. Methanol fuel is intended. Large Eddy Simulation method was used and the OpenFoam software, one-equation sub-grid model and eddy dissipation combustion model were performed. Results in two different conditions (fuel bed of 5.8 and 7 cm) were obtained and compared with the experimental results. By comparing the numerical results with the experimental results, it is observed that the numerical results of the mean temperature in the middle and corner of the room are consistent with the experimental results. The results of the various sub-grid models in the center line show that the WALE model fits better with the experimental results and also the performance of the two one-equation and Smagorinsky sub-grid models is lower than WALE. On average, the relative error percentage of the WALE model is 7.3 percent, while each of the Smagorinsky and one-equation models have error of 8 and 8.9 percent compared to the experimental results, respectively. The results of the three sub-grid models in the corner are not significantly different and are more consistent with the experimental results. The corner line error of the room being less than 8%.

کلیدواژه‌ها [English]

  • Fire whirl
  • Large Eddy Simulation
  • WALE
  • Smagorinsky
  • One equation subgrid scales

مراجع

  1. K. Himoto and T. Naruse, “Probabilistic aspect of fire whirl generation around an L-shaped fire source in a crosswind,” Fire Safety Journal, Vol. 88, 2017, pp. 89-95.
  2. H. Yu, S. Guo, M. Peng, Q. Li, J. Ruan, W. Wan and et al., “Study on the influence of air-inlet width on fire whirls combustion characteristic,” Procedia Engineering, Vol. 62, 2013, pp. 813-820.
  3. G. Zou and W. Chow, “Generation of an internal fire whirl in an open roof vertical shaft model with a single corner gap,” Journal of fire sciences, Vol. 33, 2015, pp. 183-201.
  4. Z. Gao, S. Li, Y. Gao and W. K. Chow, “Experimental studies on characteristics of fire whirl in a vertical shaft,” Fire and Materials, Vol. 43, 2019, pp. 229-240.
  5. Y. Huo, W. Chow, and Y. Gao, “Internal fire whirls induced by pool fire in a vertical shaft,” ASME/JSME Thermal Engineering Joint Conference, Honolulu, Hawaii, USA, 2011, p. T20034.
  6. J. Lei, N. Liu, L. Zhang and K. Satoh, “Temperature, velocity and air entrainment of fire whirl plume: A comprehensive experimental investigation,” Combustion and Flame, Vol. 162, 2015, pp. 745-758.
  7. T. Sasaki, M. Igari, and K. Kuwana, “Fire whirls behind an L-shaped wall in a crossflow,” Combustion and Flame, Vol. 197, 2018, pp. 197-203.
  8. A. Yuen, G. Yeoh, S. Cheung, Q. Chan, T. Chen, W. Yangand et al., “Numerical study of the development and angular speed of a small-scale fire whirl,” Journal of computational science, Vol. 27, 2018, pp. 21-34.
  9. W. Chow, J. Dang, Y. Gao and C. Chow, “Dependence of flame height of internal fire whirl in a vertical shaft on fuel burning rate in pool fire,” Applied Thermal Engineering, Vol. 121, 2017, pp. 712-720.
  10. R. M. Parente, J. M. C. Pereira and J. C. F. Pereira, “On the influence of circulation on fire whirl height,” Fire Safety Journal, Vol. 106, 2019, pp. 146-154.
  11. H. Pasdarshahri, G. Heidarinejad and K. Mazaheri, “Large eddy simulation on one-meter methane pool fire using one-equation sub-grid scale model,” proceedingsof theSeventh Mediterranean Combustion Symposium, Cagliari, Sardinia, Italy, September 11-15, 2011.
  12. A. Yuen, G. Yeoh, V. Timchenko, S. Cheung and T. Chen, “Study of three LES subgrid-scale turbulence models for predictions of heat and mass transfer in large-scale compartment fires,” Numerical Heat Transfer, Part A: Applications, Vol. 69, 2016, pp. 1223-1241.
  13. K. McGrattan, R. Rehm, and H. Baum, “Fire-driven flows in enclosures,” Journal of Computational Physics, Vol. 110, 1994, pp. 285-291.
  14. O. M. Knio, H. N. Najm and P. S. Wyckoff, “A semi-implicit numerical scheme for reacting flow: II. Stiff, operator-split formulation,” Journal of Computational Physics, Vol. 154, 1999, pp. 428-467.
  15. G. Maragkos, T. Beji and B. Merci, “Towards predictive simulations of gaseous pool fires,” Proceedings of the Combustion Institute, Vol. 37, 2019, pp. 3927-3934.
  16. O. Ahmadi, S. B. Mortazavi, H. Pasdarshahri and H. A. Mohabadi, “Consequence analysis of large-scale pool fire in oil storage terminal based on computational fluid dynamic (CFD),” Process Safety and Environmental Protection, Vol. 123, 2019, pp. 379-389.
  17. A. C. Y. Yuen, G. H. Yeoh, V. Timchenko, S. C. P. Cheung, Q. N. Chan and T. Chen, “On the influences of key modelling constants of large eddy simulations for large-scale compartment fires predictions,” International Journal of Computational Fluid Dynamics, Vol. 31, 2017, pp. 324-337.
  18. A. C. Y. Yuen, G. H. Yeoh, V. Timchenko and T. Barber, “LES and multi-step chemical reaction in compartment fires,” Numerical Heat Transfer; Part A: Applications, Vol. 68, 2015, pp. 711-736.
  19. H. Pasdarshahri, G. Heidarinejad, and K. Mazaheri, “Comparison of Turbulence Sub-Grid Scale Model for Modeling of Large Scale Pool Fire Using LES,” Energy: Engineering & Managment, Vol. 3, 2013, pp. 52-61.
  20. T. Echekki and E. Mastorakos, Turbulent combustion modeling: Advances, new trends and perspectives, Vol. 95, Springer Science & Business Media, Netherlands, 2010.
  21. P. P. S. da Costa, “Validation of a mathematical model for the simulation of loss of coolant accidents in nuclear power plants,” Master Thesis, Department of Mechanical Engineering, Técnico Lisboa, Portugal, 2016.
  22. W. Chow and S. Han, “Experimental data on scale modeling studies on internal fire whirls,” International Journal on Engineering Performance-Based Fire Codes, Vol. 10, 2011, pp. 63-74.
  23. G. Maragkos and B. Merci, /Large Eddy Simulations of CH4 Fire Plumes,” Flow, Turbulence and Combustion, Vol. 99, 2017, pp. 239-278.
  24. G. Yeoh, S. Cheung, J. Tu and T. Barber, “Comparative Large Eddy Simulation study of a large-scale buoyant fire,” Heat and mass transfer, Vol. 47, 2011, pp. 1197-1208.
  25. G. Heidarinejad, H. PasdarShahri and M. safarzadeh, “The Importance of using the Combustion and Sub-grid Model Modelling of Large Pool Fire Flow Field,” Amirkabir Journal of Mechanical Engineering, Vol. 50, No. 4, 2019,pp. 1-3.
  26. S. C. P. Cheung, G. H. Yeoh, A. L. K. Cheung, R. K. K. Yuen and S. M. Lo, “Flickering behavior of turbulent buoyant fires using large-eddy simulation,” Numerical Heat Transfer; Part A: Applications, Vol. 52, 2007, pp. 679-712.
  27. h. pasdarshahri, improved of compatible subgrid scale  with Large Eddy Simulation for numerical simulation of fire in closed space, PhD Thesis, Department of Mechanical Engineering, Tarbiat Modares University, Iran, 2013.

 

 

 

 

 

 

 

 

 

 

 

فایل ها

سابقه مقاله

  • تاریخ دریافت: 08 اسفند 1398
  • تاریخ بازنگری: 04 اردیبهشت 1399
  • تاریخ پذیرش: 22 اردیبهشت 1399

اشتراک گذاری

ارجاع به این مقاله

آمار