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Effects of Acoustic Excitation on NOx Emission in Partially Premixed LPG/Air Flames  

장준영 (계명대학교 대학원 기계공학과)
박성호 (경일대학교 기계공학과)
김태권 (계명대학교 기계자동차공학부)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.10, no.3, 2002 , pp. 77-84 More about this Journal
Abstract
Measurements of NO and NOx emission of laminar partially premixed LPG/air flames with and without acoustic excitation are reported. The NOx emission at the tailpipe of a combustion chamber is determined by chemiluminescent analyser. The NOx measurements are taken in flames with several different center tube equivalance ratio( ø$\sub$o/), and overall equivalace ratio(ø$\sub$o/) for a fixed fuel flowrate. The NOx emission decrease to reach a minimum value at an optimum ø$\sub$c/ 2. Theø$\sub$c/ 2 flame gives a compromise of thermal NO and prompt NO mechanism. In the case of excitation. the visual shape of the flame is changed from laminar flame to turbulent-like flame. With increasing levels of excitation amplitude, an optimum value of the NO and NOx emission exists. A shorter flame caused by the enhanced upstream mixing due to acoustic excitation results in the reduction of NO and NOx emission in the present flames. The reduction of flame length affects the shorter residence time of center tube mixture, and significantly influences the NOx reduction.
Keywords
NOx emission; Partially premixed flame; Acoustic excitation; Excitation frequency; Flame control;
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1 J. P. Gore, N. J. Zhan, 'NOx Emission and Major Species Concentrations in Partially Premixed Laminar Methane/Air Co-Flow Jet Flames,' Combust. Flame, Vol.105, pp.414-427, 1996   DOI   ScienceOn
2 S. R. Tums, F. H. Myhr, R. V. Bandaru, E. R. Maund, 'Oxide of Nitrogen Emission from Turbulent Jet Flames : Part II - Fuel Dilution and Partial Premixing Effects,' Combust. Flame, Vol.95, p.255,1993
3 T. K. Kim, B. J. Alder, N. M. Laurendeau, J. P. Gore, 'Exhaust and In-Situ Measurements of Nitric Oxide for Laminar Partially Premixed $C_2H_6$-Air Flames : Effect of Premixing Level at Constant Fuel Flowlate,' Combust. Sci. Tech, Vol.110-111, pp.361-378, 1995   DOI
4 J. F. Driscoll, R. H. Chen, Y. Yoon, 'Nitric Oxide Levels of Turbulent Jet Diffusion Flames : Effects of Residence Time and Damkohler Number,' Combust. Flame, Vol.88, p.37, 1992   DOI   ScienceOn
5 T. K. Kim, J. Park, H. D. Shin, 'Mixing Mecha-nism near the Nozzle Exit in a Tone Excited Non-Premixed Jet Flame,' Combust. Sci. Tech, Vol. 89, pp-83-100, 1993   DOI   ScienceOn
6 김태권, 장준영, '예혼합 LPG/공기화염에 서연소생성물의 국소농도 및 화염온도 특성,'한국자동차공학회논문집, 제9권 제4호, pp.77-84, 2001
7 M. Nishioka, S. Nakagawa, Y. Ishikawa, T. Takino, 'NO Emission Characteristics of Methane-air Double Flame,' Combust. Flame, Vol.98, p.127, 1994   DOI   ScienceOn