ارزیابی مدل‌های احتراقی در احتراق محیط متخلخل با نسبت هوای اضافی مختلف

نوع مقاله : مقاله پژوهشی

نویسندگان

1 فردوسی مشهد

2 مهندسی مکانیک دانشگاه فردوسی مشهد

چکیده

در این مقاله به بررسی همزمان اثرات نسبت هوای اضافی و مکانیزم‌های احتراقی بر روی دما و انتشار گونه‌ها در مشعل‌های محیط متخلخل با تغییر تخلخل پیوسته پرداخته شده است. برای این هدف از سینتیک‌های چند مرحله‌ای استفاده شده است و اثرات آ‌ن‌ها بر روی پروفیل دما، کسر جرمی گونه‌های اصلی و انتشار آلاینده‌ها برای مقادیر مختلف نسبت هوای اضافی مورد بررسی قرار گرفته است. معادلات حاکم بر مسألهشامل معادله پیوستگی، معادلات مومنتوم، معادلات انرژی فاز گاز و جامد و معادله بقاء گونه‌های شیمیایی با استفاده از روش حجم محدود حل شده و از الگوریتم سیمپل برای ارتباط بین سرعت و فشار استفاده شده است. نتایج نشان داد که به ازای نسبت هوای اضافی 5/1، نتایج ناشی از مکانیزم های احتراقی دارای دقت یکسان در پیش بینی پروفیل دما و کسر جرمی گونه‌های اصلی هستند و بعد از آن برای مقادیر بیشتر نسبت هوای اضافی نتایج ناشی از مکانیزم‌های احتراقی اختلاف کمی را نشان می‌دهد. این در حالی است که بیشترین اختلاف در نتایج برای حالت استوکیومتری مشاهده می‌شود. همچنیندر شرایط استوکیومتری میزان انتشار مونو اکسید نیتروژن با استفاده از مکانیزم احتراقی  مقدار صفر پیش بینی می‌شود و برای بقیه ضرایب نسبت هوای اضافی مقدار آن از مرتبه بزرگی  خواهد بود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of Combustion Models in a Porous Medium with Different Excess Air Ratios

نویسندگان [English]

  • Hossein Ajam 1
  • iman mohammadi 2
2 mechanical engineering ferdowsi university of mashhad
چکیده [English]

 In this paper, the simultaneous study of the effects of the excess air ratio and the combustion mechanisms on the temperature and distribution of species in the porous medium burners with continuous porosity variation has been investigated. For this purpose, multi-step chemical kinetics have been used and their effects on the temperature profile, mass fraction of the main species and emission of pollutants for different values of the excess air ratio have been investigated. Problem-solving equations include continuity equation, momentum equations, gas, and solid phase energy equations, and the chemical equilibrium equation is solved using the finite volume method and the semi-implicit method for pressure linked equations algorithm is used for the relationship between velocity and pressure. The results showed that for excess air ratio of 1.5, the results of combustion mechanisms have the same accuracy in predicting the temperature profile and mass fraction of the main species, and then, for additional values of the excess air ratio, the results of the combustion mechanisms Show a slight difference. This is while the greatest difference in the results is observed for the stoichiometric condition. Also in stoichiometric conditions, the NO emission rate using the GRI-3.0 combustion mechanism is predicted to be zero, and for the rest of the coefficients of the excess air ratio, its value will be of the order of magnitude 10-6.

کلیدواژه‌ها [English]

  • Porous media burner
  • Chemical kinetic
  • Porosity variation
  • Axisymmetric combustion
  • Excess air ratio
[1] G. Brenner, K. pickenacker, O. Pickenacker, D. Trimis, K. Wawrzinek, T. Weber, Numerical and Experimental Investigation of Matrix Stabilized Methane-Air Combustion in Porous Inert Media, Combustion and Flame, 123 (2000) 201-213.
[2] I. Malico, J. Pereira, Numerical Study on the Influence of Radiative Properties in Porous Media Combustion, Journal of Heat Transfer 123 (2001) 951-957.
[3] C.-J. Tseng, Effect of Hydrogen Addition on Methane Combustion in a Porous Medium Burner, International Journal of Hydrogen Energy, 27 (2002) 699-707.
[4] P. Talukdar, S. Mishra, D. Trimis, F. Durst, Heat Transfer Characteristics of a Porous Radiant Burner under the Influence of a 2D Radiation Field, Journal of Quantitative Spectroscopy & Radiative Transfer, 84(4) (2003) 527-537.
[5] S.C. Mishra, M. Steven, S. Nemoda, P. Talukdar, D. Trimis, F. Durst, Heat Transfer Analysis of a Two-Dimensional Rectangular Porous Radiant Burner, International Communication in Heat and Mass Transfer, 33 (2006) 467-474.
[6] K. Lari, S.A. Ganjalikhan nassab, Transient Thermal Characteristics of Porous Radiant Burners, Iranian Journal of Science and Technology, transaction b-engineering, 31 (2007) 407-420.
[7] S. Hossainpour, B. Haddadi, Numerical Study of the Effects of Porous Burner Parameters on Combustion and Pollutants Formation in:  Proceedings of the World Congress on Engineering, 2008, pp. 1505-1510.
[8] F. Avdic, M. Adzic, F. Durst, Small Scale Porous Medium Combustion System for Heat Production in Households Application, Energy, 87 (2010) 2148-2155.
[9] M. Bidi, M.R.H. Nobari, M. Saffar Aval, A Numerical Evaluation of Combustion in Porous Media by EGM (Entropy Generation Minimization), Energy, 35 (2010) 3483-3500.
[10] V.K. Pantangi, S.C. Mishra, P. Muthukumar, R. Reddy, Studies on Porous Radiant Burners for LPG (liquefied petroleum gas) Cooking Applications, Energy, 36 (2011) 6074-6080.
[11] P. Muthukumar, P. Anand, P. Sachdeva, Performance Analysis of Porous Radiant Burners Used in LPG Cooking Stove, International Journal of Energy and Environment, 2 (2011) 67-74.
[12] I. Mohammadi, S. Hossainpour, The Effects of Chemical Kinetics and Wall Temperature on the Performance of Porous Media Burners, Heat and Mass Transfer, 49 (2013) 869-877.
[13] I. Mohammadi, S. Hossainpour, Investigation of the Effects of Several Porosity Variation Profiles on Performance and Pollutants Emission of the Porous Media Burners, Fire and Materials, 40 (2014) 3-17.
[14] C.Y. Wu, K.H. Chen, S.Y. Yang, Experimental Study of Porous Metal Burners for Domestic Stove Applications, Energy Conversion and Management, 77 (2014) 380-388.
[15] S.A. Hashemi, M. Dastmalchi, M. Nikfar, Experimental Study Flashback Phenomenon in Porous Ceramic, Amirkabir Journal of Science & Research (Mechanical Engineering), 46 (2014) 25-35.
[16] S.A. Hashemi, E. Noori, A. Aghaei, Experimental Study of Non-Premixed Turbulent Flame Stabilization with Porous Medium, Modares Mechanical Engineering, 15 (2015) 341-349.
[17] H. Shabani Nejad, A. Gandjalikhan Nassab, E. Jahanshahi Javaran, Numerical Study on Radiant Efficiency of a Porous Burner under Different Conditions, Journal of Thermophysics and Heat Transfer, 32 (2017) 1-8.
[18] N. Donald A, A. Bejan, Convection in Porous Media, Third ed., Springer-Verlag, NewYork, 2006.
[19] M. Farzaneh, R. Ebrahimi, M. Shams, M. Shafiey, Two-Dimensional Numerical Simulation of Combustion and Heat Transfer in Porous Burners, Engineering Letters, 15(2) (2007) 370-375.
[20] I. Malico, X.Y. Zhou, J.C.F. Pereira, Two-Dimensional Numerical Study of Combustion and Pollutants Formation in Porous Burners, Combustion Science and Technology, 152 (2000) 57-79.
[21] S. Nemoda, D. Trimis, G. Zivkovich, Numerical Simulation of Porous Burners and Hole Plate surface Burners, Journal of Thermal Science, 8 (2004) 3-17.
[22] S. Ergun, Fluid Flow through Packed Columns, Chemical Engineering Progress, 48 (1952) 89-94.
[23] I.F. MacDonald, M.S. EI-Sayed, K. Mow, F.A.L. Dullien, Flow through Porous Media Ergun Equation Revisited,
Industrial & Engineering Chemistry Fundamentals, 18 (1979) 199-208.
[24] X. Fu, R. Viskanta, J.P. Gore, Measurement and Correlation of Volumetric Heat Transfer Coefficients of Cellular Ceramics, Experimental Thermal, and Fluid Science, 17 (1998) 285-293.
[25] M. Kaviany, Principles of Heat Transfer in Porous Media, Second ed., Springer-Verlag, New York, 1999.
[26] R. Viskanta, Interaction of combustion and heat transfer in porous inert media, in: Proceeding of 8th International Symposium on Transport Phenomena in Combustion, 1996, pp. 64-87.
[27] L.B. Younis, R. Viskanta, Experimental Determination of the Volumetric Heat Transfer Coefficient between Steam of Air and Ceramic Foam, International journal of Heat Mass Transfer, 36 (1993) 1425-1434.
[28] L.A. Catalano, A. Dadone, D. Manodoro, A. Saponaro, Efficient Design Optimization of Duct-Burners for Combined Cycle and Cogenerative Plants, Engineering Optimization, 38 (2006) 801-820.
[29] H.L. Pan, O. Pickenacker, K. Pickenacker, D. Trimis, T. Weber, in:  5th European Conference on Industrial Furnaces and Boilers, 2000, pp. 11-14.
[30] E.U. Schlünder, E. Tsotsas, Wärmeübertragung n Festbetten, druchmischten Schüttgütern und Wirbelschichten, Georg Thieme Verlag, Stuttgart– New York, 1988.
[31] K. Vafai, Handbook of Porous Media, Second ed., Taylor & Francis Group, LLC USA, 2005.
[32] C.T. Bowman, R.K. Hanson, D.F. Davidson, W.C. Gardiner, J. Lissianski, V., G.P. Smith, D.M. Golden, M. Frenklach, M. Goldenberg, http://www.me.berkeley.edu/gri_mech/.
[33] P.N. Brown, G.D. Byrne, A.C. Hindmarsh, VODE: A Variable Coefficient ODE Solver, SIAM Journal on Scientific and Statistical Computing, 10 (1989) 1038-1051.
[34] R.J. Kee, G. Dixon-Lewis, J. Warnatz, M.E. Coltrin, J.A. Miller, A Fortran Computer Code Package for the Evaluation of Gas-Phase Multi-Component Transport Properties, Sandia National Laboratories Report SAND86-8246,  (1986).
[35] F. Durst, D. Trimis, Compact Porous Medium Burner and Heat Exchanger for Household Applications, EC project report (contract no. JOE3-CT95-0019),  (1996).
[36] GRI-Mech Home page,http://www.me.berkeley.edu/gri-mech