Abstract
An ejector of low NO x burner was designed for a gas instantaneous water heater in this work. The flowing and mixing process of the ejector was investigated by computational fluid dynamics (CFD) approach. A comprehensive study was conducted to understand the effects of the geometrical parameters on the static pressure of air and methane, and mole fraction uniformity of methane at the outlet of ejector. The distribution chamber was applied to balance the pressure and improve the mixing process of methane and air in front of the fire hole. A distribution orifice plate with seven distribution orifices was introduced at the outlet of the ejector to improve the flow organization. It is found that the nozzle exit position of 5 mm and nozzle diameter d >1.3 mm should be used to improve the flow organization and realize the well premixed combustion for this designed ejector.
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FU Zhong-cheng, AI Xiao-yi, WANG Tian-fei. New technology of natural gas combustion and energy saving and environmental protection [M]. Beijing: China Building Industry Press, 2007: 76–77. (in Chinese)
ZHOU Qing-fang, YANG Qing-quan, SHEN Yi-bing. Simulation of Low NOx burner with rich and lean combustion of gas water heater [J]. Gas and Heat, 2004, 24(12): 12–16. (in Chinese)
BAI Li-ping, Fu Zhong-cheng. Using metallic insert for reducing nitrogen oxides emissions from gas water heater [J]. Gas and Heat, 1999,(11): 32–35. (in Chinese)
BIZZI M, SARACCO G, SPECCHIA V. Improving the flashback resistance of catalytic and non-catalytic metal fiber burners [J]. Chemical Engineering Journal, 2003, 95(1/2/3): 123–136.
MOBBAUER S, PICKENACKER O, PICKENACHER K, TRIMIS D. Application of the porous burner technology in energy and heat-engineering [J]. Clean Air, 2002, 3(2): 185–198.
XIANG You-qian, WANG Qi. Natural gas combustion process and application manual [M]. Beijing: China Building Industry Press, 2008. 2008. (in Chinese)
RANDHEER L Y, ASHWIN W P. Design aspects of ejectors: Effects of suction chamber geometry [J]. Chemical Engineering Science, 2008, 63(15): 3886–3897.
PIANTHONG K, SEEHANAM M, BEHNIA M, SRIVEERAKUL T, APHORNRATANA S. Investigation and improvement of ejector refrigeration system using computational fluid dynamics technique [J]. Energy Conversion and Management, 2007, 48(9): 2556–2564.
RIFFAT S B, GAN G, SMITH S. Computational fluid dynamics applied to ejector heat pumps [J]. Applied Thermal Engineering, 1996, 16(4): 291–297.
RUSLY E, AYE L, CHARTERS W W S, OOI A. CFD analysis of ejector in a combined ejector cooling system [J]. International Journal of Refrigeration-Revue Internationale Du Froid, 2005, 28(7): 1092–1101.
RIFFAT S B, OMER S A. CFD modelling and experimental investigation of an ejector refrigeration system using methanol as the working fluid [J]. International Journal of Energy Research, 2001, 25(2): 115–128.
BARTOSIEWICZ Y, AIDOUN Z, MERCADIER Y. Numerical assessment of ejector operation for refrigeration applications based on CFD [J]. Applied Thermal Engineering, 2006, 26(5/6): 604–612.
SRIVEERAKUL T, APHORNRATANA S, CHUNNANOND K. Performance prediction of steam ejector using computational fluid dynamics: Part 1. Validation of the CFD results [J]. International Journal of Thermal Sciences, 2007, 46(8): 812–822.
SRIVEERAKUL T, APHORNRATANA S, CHUNNANOND K. Performance prediction of steam ejector using computational fluid dynamics: Part 2. Flow structure of a steam ejector influenced by operating pressures and geometries [J]. International Journal of Thermal Sciences, 2007, 46(8): 823–833.
LI Xian-chang, WANG Ting, DAY B. Numerical analysis of the performance of a thermal ejector in a steam evaporator [J]. Applied Thermal Engineering, 2010, 30(17/18): 2708–2717.
HEMIDI A, HENRY F, LECLAIRE S, SEYNHAEVE J M, BARTOSIEWICZ Y, CFD analysis of a supersonic air ejector. Part I: Experimental validation of single-phase and two-phase operation [J]. Applied Thermal Engineering, 2009, 29(8/9): 1523–1531.
VARGA S, OLIVEIRA A C, DIACONU B. Numerical assessment of steam ejector efficiencies using CFD [J]. International Journal of Refrigeration-Revue Internationale Du Froid, 2009, 32(6): 1203–1211.
ZHU Yin-hai, CAI Wen-jian, WEN Chang-yun. Numerical investigation of geometry parameters for design of high performance ejectors [J]. Applied Thermal Engineering, 2009, 29(5/6): 898–905.
HE S, LI Y, WANG R Z. Progress of mathematical modeling on ejectors [J]. Renewable and Sustainable Energy Reviews, 2009, 13(8): 1760–1780.
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Foundation date: Project(NR2013K04) supported by Beijing Key Lab of Heating, Gas Supply, Ventilating and Air Conditioning Engineering, China; Project(20130909) supported by the Higher School Science and Technology Development Fund of Tianjin, China
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Liu, Fg., Zhang, R., Liu, Wb. et al. Numerical investigation of optimal geometry parameters for ejectors of premixed burner. J. Cent. South Univ. 21, 1011–1016 (2014). https://doi.org/10.1007/s11771-014-2031-3
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DOI: https://doi.org/10.1007/s11771-014-2031-3