Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 28, No. 3 (March 2015) 454-459   

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  EFFECT OF HEAT RECIRCULATION IN BIOMASS FLAME STABILITY WITHIN A CYLINDRICAL MICRO-COMBUSTOR (TECHNICAL NOTE)
 
M. Bidabadi and M. J. Noroozi
 
( Received: October 16, 2014 – Accepted: December 18, 2014 )
 
 

Abstract    Flame stability inside a cylindrical micro-combustor was studied. Considering occurrence of heat recirculation, the respective relations were written and with parameters such as motion speed of reactants, flame propagation speed and thermal conductivity of the combustor’s wall, flame stability and its location inside micro-combustor were studied. It was found that for each thermal conductivity of the combustor’s wall, there is only one point inside the micro-combustor that if flame is formed in that point, it will be able to remain stable inside micro-combustor. It was also found that for each thermal conductivity of the combustor’s wall, flame inside the combustor remains stable only in one specified range of motion speed of reactants. In addition, blow-off limits were obtained for high and low speeds of reactants inside the combustor for different values of thermal conductivity of the combustor’s wall.

 

Keywords    Analytical model, Heat Recirculation, Wood Particles, Burning Velocity, Blow-Off Limits

 

چکیده    پایداری شعله، درون یک میکرو کامباستور استوانه ای مورد بررسی قرار گرفت. با در نظر گرفتن رخداد پدیده ی گردش حرارتی، روابط مربوطه نوشته شد و با استفاده پارامترهایی نظیر سرعت حرکت مواد واکنش دهنده، سرعت انتشار شعله و ضریب هدایت حرارتی جداره ی کامباستور، پایداری شعله و محل قرارگیری آن درون میکرو کامباستور مورد بررسی واقع شد. مشاهده گردید که به ازای هر ضریب هدایت حرارتی جداره ی مشخص، تنها یک نقطه درون میکروکامباستور وجود دارد که اگر شعله در آن نقطه تشکیل شود، قادر به پایدار ماندن درون میکرو کامباستور است. همچنین مشاهده شد که به ازای هر ضریب هدایت حرارتی جداره ی مشخص، تنها در یک محدوده ی مشخصی از سرعت حرکت مواد واکنش دهنده، شعله درون کامباستور پایدار می ماند. علاوه بر آن، به ازای مقادیر مختلف ضریب هدایت حرارتی جداره ی کامباستور، حدود خاموشی برای سرعت های بالا و پایین حرکت مواد واکنش دهنده درون کامباستور، به دست آمد.

References   

 

1.      Ronney, P.D., "Analysis of non-adiabatic heat-recirculating combustors", Combustion and Flame,  Vol. 135, No. 4, (2003), 421-439.

2.      Waitz, I.A., Gauba, G. and Tzeng, Y.-S., "Combustors for micro-gas turbine engines", Journal of Fluids Engineering,  Vol. 120, No. 1, (1998), 109-117.

3.      Sitzki, L., Borer, K., Schuster, E., Ronney, P.D. and Wussow, S., "Combustion in microscale heat-recirculating burners", in The Third Asia-Pacific Conference on Combustion, Seoul, Korea. Vol. 6, (2001), 11-14.

4.      Yang, W., Chou, S., Shu, C., Li, Z. and Xue, H., "Development of microthermophotovoltaic system", Applied physics letters,  Vol. 81, No. 27, (2002), 5255-5257.

5.      Li, J., Chou, S.K., Li, Z. and Yang, W., "Development of 1d model for the analysis of heat transport in cylindrical micro combustors", Applied Thermal Engineering,  Vol. 29, No. 8, (2009), 1854-1863.

6.      Fernandez-Pello, A.C., "Micropower generation using combustion: Issues and approaches", Proceedings of the Combustion Institute,  Vol. 29, No. 1, (2002), 883-899.

7.      Seshadri, K., Berlad, A. and Tangirala, V., "The structure of premixed particle-cloud flames", Combustion and Flame,  Vol. 89, No. 3, (1992), 333-342.

8.      Hassani, M., Amini, G., Najafpour, G. and Rabiee, M., "A two-step catalytic production of biodiesel from waste cooking oil", International Journal of Engineering-Transactions C: Aspects,  Vol. 26, No. 6, (2012), 563.

9.      Bidabadi, M., Noroozi, M. and Fereidooni, J., "Heat recirculation effect on the structure of wood dust flame propagation", International Journal of Engineering-Transactions B: Applications,  Vol. 25, No. 2, (2012), 143.

10.    Jafarmadar, S. and Pashae, J., "Experimental study of the effect of castor oil biodiesel fuel on performance and emissions of turbocharged di diesel", International Journal of Engineering-Transactions B: Applications,  Vol. 26, No. 8, (2013), 905.

11.    Leach, T., "Effect of structural heat conduction on the performance of micro-combustors and micro-thrusters",  (2005).

12.    Buckmaster, J. and Takeno, T., "Blow-off and flashback of an excess enthalpy flame",  (1981).

13.    Churchill, S.W., "Thermally stabilized combustion", Chemical engineering & technology,  Vol. 12, No. 1, (1989), 249-254.

14.    Mills, A.F., "Basic heat and mass transfer, Pearson College Div,  (1999).

15.    Turn                s, S.R., "An introduction to combustion, McGraw-hill New York,  Vol. 287,  (1996).





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