بررسی عوامل مؤثر بر عملکرد یک سیستم‌ میکروترموفتوولتائیک با میکرومحفظه احتراقی متخلخل

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه کاشان، کاشان، ایران

2 کاشان-کیلومتر 6 بلوار قطب راوندی-دانشگاه کاشان-دانشکده مهندسی- گروه مهندسی مکانیک

چکیده

مزیت سیستم‌های میکروترموفتوولتائیک تبدیل مستقیم انرژی گرمایی به انرژی الکتریکی بدون بخش متحرک می‌باشد. برای عملکرد مناسب سیستم‌های ترموفتوولتائیک، دمای یکنواخت و بالا در امتداد دیوار میکرومحفظه لازم است. در تحقیق حاضر احتراق پیش مخلوط آرام هیدروژن هوا در یک میکرومحفظه با در نظرگرفتن شرط عدم تعادل حرارتی بین فاز گاز و جامد در محیط متخلخل مطالعه شده‌است. همچنین اثرات انتقال حرارت تابشی در ماده متخلخل در معادله انرژی ماده متخلخل نیز درنظرگرفته شده‌‌است. با استفاده از شبیه‌سازی عددی، اثر چند پارامتر مهم در بازده تابشی سیستم‌ میکروترموفتوولتائیک که شامل نسبت هم‌ارزی هیدروژن به هوا، ضریب تخلخل و هدایت گرمایی ماده متخلخل و سرعت ورودی مخلوط هیدروژن-هوا می‌باشد، مورد مطالعه قرار گرفته‌‌است. نتایج نشان می‌دهد که افزایش نسبت هم‌ارزی تا مقدار یک باعث افزایش دمای دیوار و افزایش ضریب هدایت گرمایی ماده متخلخل، باعث توزیع یکنواخت‌تر دمای دیوار میکرومحفظه می‌شود. همچنین کاهش سرعت جریان، ضریب تخلخل و هدایت گرمایی ماده متخلخل، باعث افزایش بازده تابشی سیستم می‌شود. مکانیزم ‌انتقال حرارت جابجایی بین فازهای گاز و جامد داخل محیط متخلخل و انتقال حرارت تابشی و هدایتی در ماده متخلخل برای ضریب تخلخل‌های 4/0 و 8/0 مقایسه شده است و نشان داده‌‌ شد که نقش انتقال حرارت تابشی داخل ماده متخلخل ناچیز می‌‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Study of the effective parameters on the performance of a micro thermophotovoltaic system with micro porous combustion chamber

نویسندگان [English]

  • mohammadsaaber khosravi 1
  • seyed abdolmehdi hashemi 2
1 Department of Mechanical Engineering, University of Kashan, Kashan, Iran
چکیده [English]

The advantage of micro thermophotovoltaic systems is the direct conversion of heat energy into electrical energy without any moving parts. For an adequate performance of thermophotovoltaic systems, uniform and high temperature along the micro-chamber wall is required. In the present study, a laminar premixed combustion of hydrogen-air in a micro porous chamber is studied. Non-equilibrium thermal condition between gas and solid phases and radiative transport equation in solid phase is considered . Using numerical simulation, the effect of several parameters on the radiation efficiency of thermophotovoltaic system including equivalence ratio, porosity, porous thermal conductivity and inlet mixture velocity have been studied. The results show that increasing the equivalence ratio up to 1 increases the wall temperature and increasing the thermal conductivity of the porous medium, results in a more uniform temperature distribution. Also decreasing the inlet velocity, porosity and thermal conductivity of the porous medium increases the system's radiation efficiency. The convection heat transfer between the gas and solid phases inside the porous and the radiation and conduction heat transfer in the porous for the porosity of 0.4 and 0.8 were compared and it was shown that the role of radiation heat transfer inside the porous is negligible.

کلیدواژه‌ها [English]

  • Microcombustor
  • Porous Media
  • numerical simulation
  • Non-equilibrium thermal
  • radiation efficiency
[1] L.C. Chia, B. Feng, The development of a micropower (micro-thermophotovoltaic) device, Journal of Power Sources, 165(1) (2007) 455-480.
[2] I.A. Waitz, G. Gauba, Y.-S. Tzeng, Combustors for micro-gas turbine engines, (1998).
[3] K. Fu, A.J. Knobloch, F.C. Martinez, D.C. Walther, C. Fernandez-Pello, A.P. Pisano, D. Liepmann, K. Miyaska, K. Maruta, Design and experimental results of small-scale rotary engines, in:  Proceedings of the 2001 International Mechanical Engineering Congress and Exposition (IMECE), 2001, pp. 11-16.
[4] S. Zhang, J. Wang, A Novel Micro Free-Piston Swing Engine (MFPSE) and the Validation of Its Feasibility (Part 1), 0148-7191, SAE Technical Paper, 2003.
[5] G.J. Snyder, J.R. Lim, C.-K. Huang, J.-P. Fleurial, Thermoelectric microdevice fabricated by a MEMS-like electrochemical process, Nature materials, 2(8) (2003) 528-531.
[6] H. Xue, W. Yang, S. Chou, C. Shu, Z. Li, Microthermophotovoltaics power system for portable MEMS devices, Microscale thermophysical engineering, 9(1) (2005) 85-97.
[7] A. Bicen, D. Tse, J. Whitelaw, Combustion characteristics of a model can-type combustor, Combustion and flame, 80(2) (1990) 111-125.
[8] M. Maekawa, Flame quenching by rectangular channels as a function of channel length for methane-air mixture, Combustion Science and technology, 11(3-4) (1975) 141-145.
[9] S. Raimondeau, D. Norton, D. Vlachos, R. Masel, Modeling of high-temperature microburners, Proceedings of the Combustion Institute, 29(1) (2002) 901-907.
[10] A. Linan, F.A. Williams, Fundamental aspects of combustion, (1993).
[11] R.I. Masel, M.A. Shannon, Microcombustor having submillimeter critical dimensions, in, Google Patents, 2001.
[12] J. Zarvandi, S. Tabejamaat and M. R. Baig Mohammadi, Numerical Simulation of the Effective Parameters on the Stability of Stoichiometric CH4/Air Premixed Combustion in a Micro-combustion Chamber, Fuel and Combustion, Tarbiat Modares University, Tehran, Iran, 2010.(in Persian)
[13] M. H. Saberi Moghaddam, K. Mazaheri, A. Alipoor, Numerical study of bluff body effect in lean premix hydrogen/air combustion in a micro- scale combustor, Modares Mechanical Engineering, Vol. 14, No. 13, pp. 86-94, 2015 (In Persian)
[14] M.A. Mujeebu, M.Z. Abdullah, M.A. Bakar, A. Mohamad, M. Abdullah, Applications of porous media combustion technology–a review, Applied energy, 86(9) (2009) 1365-1375.
[15] J.E. Sanmiguel, S. Mehta, R.G. Moore, An experimental study of controlled gas-phase combustion in porous media for enhanced recovery of oil and gas, J. Energy Resour. Technol., 125(1) (2003) 64-71.
[16] T. Marbach, A. Agrawal, A meso-scale combustor using annular porous inert media for heat recirculation, in:  43rd AIAA Aerospace Sciences Meeting and Exhibit, 2005, pp. 942.
[17] F. Avdic, M. Adzic, F. Durst, Small scale porous medium combustion system for heat production in households, Applied Energy, 87(7) (2010) 2148-2155.
[18] S. Chou, W. Yang, J. Li, Z. Li, Porous media combustion for micro thermophotovoltaic system applications, Applied Energy, 87(9) (2010) 2862-2867.
[19] W. Yang, S. Chou, K. Chua, J. Li, X. Zhao, Research on modular micro combustor-radiator with and without porous media, Chemical engineering journal, 168(2) (2011) 799-802.
[20] K. Chua, W. Yang, W. Ong, Fundamental experiment and numerical analysis of a modular microcombustor with silicon carbide porous medium, Industrial & engineering chemistry research, 51(18) (2012) 6327-6339.
[21] J. Pan, D. Wu, Y. Liu, H. Zhang, A. Tang, H. Xue, Hydrogen/oxygen premixed combustion characteristics in micro porous media combustor, Applied Energy, 160 (2015) 802-807.
[22] S. Bani, J. Pan, A. Tang, Q. Lu, Y. Zhang, Numerical investigation of key parameters of the porous media combustion based Micro-Thermophotovoltaic system, Energy, 157 (2018) 969-978.
[23] Q. Peng, W. Yang, E. Jiaqiang, H. Xu, Z. Li, W. Yu, Y. Tu, Y. Wu, Experimental investigation on premixed hydrogen/air combustion in varied size combustors inserted with porous medium for thermophotovoltaic system applications, Energy Conversion and Management, 200 (2019) 112086.
[24] Q. Peng, E. Jiaqiang, W. Yang, H. Xu, J. Chen, F. Zhang, T. Meng, R. Qiu, Experimental and numerical investigation of a micro-thermophotovoltaic system with different backward-facing steps and wall thicknesses, Energy, 173 (2019) 540-547.
[25] V. Giovangigli, M. Smooke, Extinction of strained premixed laminar flames with complex chemistry, Combustion science and technology, 53(1) (1987) 23-49.
[26] A. Dybbs, R. Edwards, A new look at porous media fluid mechanics—Darcy to turbulent, in:  Fundamentals of transport phenomena in porous media, Springer, 1984, pp. 199-256.
[27] P.-F. Hsu, W.D. EVANS, J.R. HOWELL, Experimental and numerical study of premixed combustion within nonhomogeneous porous ceramics, Combustion Science and Technology, 90(1-4) (1993) 149-172.
[28] L. Younis, R. Viskanta, Experimental determination of the volumetric heat transfer coefficient between stream of air and ceramic foam, International journal of heat and mass transfer, 36(6) (1993) 1425-1434.
[29] A. Mohamad, Combustion in porous media: fundamentals and applications, in:  Transport phenomena in porous media III, Elsevier, 2005, pp. 287-304.
[30] S. Bani, J. Pan, A. Tang, Q. Lu, Y. Zhang, Micro combustion in a porous media for thermophotovoltaic power generation, Applied Thermal Engineering, 129 (2018) 596-605.
[31] J. Li, Q. Li, J. Shi, X. Liu, Z. Guo, Numerical study on heat recirculation in a porous micro-combustor, Combustion and flame, 171 (2016) 152-161.
[32] A. Horsman, Design Optimization of a Porous Radiant Burner, University of Waterloo, 2010.