Flame Structure of a Jet Flame with Penetration of Side Micro-jets

›› 2008, Vol. 16 ›› Issue (6): 861-866.

• TRANSPORT PHENOMENA & FLUID MECHANICS • Previous Articles Next Articles

Flame Structure of a Jet Flame with Penetration of Side Micro-jets

CAO Yuchun¹, WU Jinxing¹, MI Jianchun², ZHOU Yu³

1. School of Chemical Engineering, Zhengzhou University, Henan 450001, China;
2. College of Engineering, Peking University, Beijing 100871, China;
3. Department of Mechanical Engineering, Hong Kong Polytechnic University, Hong Kong, China

Received:2008-03-26 Revised:2008-09-27 Online:2008-12-28 Published:2008-12-28
Supported by:
Supported by the Natural Science Foundation of Henan Province (20074800060)

Flame Structure of a Jet Flame with Penetration of Side Micro-jets

曹玉春¹, 吴金星¹, 米建春², 周钰³

1. School of Chemical Engineering, Zhengzhou University, Henan 450001, China;
2. College of Engineering, Peking University, Beijing 100871, China;
3. Department of Mechanical Engineering, Hong Kong Polytechnic University, Hong Kong, China

通讯作者: CAO Yuchun,E-mail:yuchun_cao@zzu.edu.cn
基金资助:
Supported by the Natural Science Foundation of Henan Province (20074800060)

Abstract

Abstract: In this paper,an innovative jet lifted flame with side micro-jets has been proposed and its effects on the flame structure have also been investigated.Due to the changes of the initial combustion conditions,mixing and aerodynamics which resulted from the perturbation of the side micro-jets,such a lifted jet flame has different flame structure compared with the common premixed flame.Results demonstrate that use of the micro-jets can control,to a certain extent,the flame structure,including the flame length,lift-off distance and blow-off limit.With the same fuel and air flow rate,the flame length with the side micro-jets will decrease about 5%-40% as the air volume ratio αincreases from 58%-76%.Compared with the common diffusion flame,the jet flame with the side micro-jets demonstrates to be easier to be a momentum-dominated flame.The flame length with 2 micro-jets is about 5% less than with 6 micro-jets under the same fuel and air flow rate.With the sameα,the fewer number of the controlled jets lead to the flame with relatively shorter length,not easier to be blown off and higher NO_x emission.With certain fuel flow rate,the critical air volume ratio is largest for the flame with 3 micro-jets,which is more difficult to be blown off than the cases with 2,4 or 6 micro-jets.

Key words: jet flame, side micro-jets, perturbation, flame structure

摘要： In this paper,an innovative jet lifted flame with side micro-jets has been proposed and its effects on the flame structure have also been investigated.Due to the changes of the initial combustion conditions,mixing and aerodynamics which resulted from the perturbation of the side micro-jets,such a lifted jet flame has different flame structure compared with the common premixed flame.Results demonstrate that use of the micro-jets can control,to a certain extent,the flame structure,including the flame length,lift-off distance and blow-off limit.With the same fuel and air flow rate,the flame length with the side micro-jets will decrease about 5%-40% as the air volume ratio αincreases from 58%-76%.Compared with the common diffusion flame,the jet flame with the side micro-jets demonstrates to be easier to be a momentum-dominated flame.The flame length with 2 micro-jets is about 5% less than with 6 micro-jets under the same fuel and air flow rate.With the sameα,the fewer number of the controlled jets lead to the flame with relatively shorter length,not easier to be blown off and higher NO_x emission.With certain fuel flow rate,the critical air volume ratio is largest for the flame with 3 micro-jets,which is more difficult to be blown off than the cases with 2,4 or 6 micro-jets.

关键词: jet flame, side micro-jets, perturbation, flame structure

CAO Yuchun, WU Jinxing, MI Jianchun, ZHOU Yu. Flame Structure of a Jet Flame with Penetration of Side Micro-jets[J]. , 2008, 16(6): 861-866.

曹玉春, 吴金星, 米建春, 周钰. Flame Structure of a Jet Flame with Penetration of Side Micro-jets[J]. , 2008, 16(6): 861-866.

References

1 Docquier, N., Candel, S., “Combustion control and sensors:A review”, Prog. Energy Combust. Sci., 28(2), 107-150(2002).
2 Nathan, G.J., Mi, J., Alwahabi, Z.T., Newbold, G.J.R., Nobes, D.S., “Impacts of a jet's exit flow pattern on mixing and combustion performance”, Prog. Energy Combust. Sci., 32(5/6), 496-538(2006).
3 Cavaliere, A., Ragucci, R., “Gaseous diffusion combustion:Simple structure and their interaction”, Prog. Energy Combust. Sci., 27(5), 547-585(2001).
4 Gutmark, E., Parr, T.P., Hanson-Parr, D.M., Schadow, K.C., “Closed-loop amplitude modulation control of reacting premixed turbulent jet”, AIAA J., 29(12), 2155-2162(1991).
5 Streicher, E., Marin, O., Charon, O., Borders, H., “Oscillation combustion technology boosts furnace efficiency”, Ind. Heating, 68(2), 35-39(2001).
6 Uhm, J.H., Acharya, S., “Control of combustion instability with a high-momentum air-jet”, Combust. Flame, 139(1/2), 106-125(2004).
7 Ishizuka, S., Motodamari, T., Shimokur, D., “Rapidly mixed combustion in a tubular flame burner”, Proc. Combust. Inst., 31(1), 1085-1092(2007).
8 Chan, S.M.S., Torii, S., Yano, T., “Enhancement of turbulent jet diffusion flame blowout limits by annular counter flow”, Int. J. Energy. Rev., 25(12), 1091-1105(2001).
9 Suzuki, H., Kasagi, N., Suzuki, Y., “Active control of an axisymmetric jet with distributed electromagnetic flap actuators”, Exp. Fluids., 36(3), 498-509(2004).
10 Kurimoto, N., Suzuki, Y., Kasagi, N., “Active control of lifted diffusion flames with arrayed micro actuators”, Exp. Fluids., 39(6), 995-1008(2005).
11 Santos, A., Costa, M., “Reexamination of the scaling laws for NO x emissions from hydrocarbon turbulent jet diffusion flames”, Combust. Flame, 142(1/2), 160-169(2005).
12 Demare, D., Baillot, F., “Acoustic enhancement of combustion in lifted nonpremixed jet flames”, Combust. Flame, 139(44), 312-328(2004).
13 Kim, T.K., Park, J., Shin, H.D., “Mixing mechanism near the nozzle exit in a tone excited non-premixed jet flame”, Combust. Sci. Technol, 89(1-4), 83-100(1993).
14 Lawn, C.J., Williams, T.C., Schefer, R.W., “The response of turbulent premixed flames to normal acoustic excitation”, Proc. Combust. Inst., 30(2), 1749-1756(2005).
15 Yoshida, H., Koda, M., Ooishi, Y., Kobayashi, K.P., Saito, M., “Super-mixing combustion enhanced by resonance between micro-shear layer and acoustic excitation”, Int. J. Heat Fluid Flow, 22(3), 372-379(2001).
16 Ahmed, M.R., Sharma, S.D., “Effect of velocity ratio on the turbulent mixing of confined, co-axial jets”, Exp. Thermal Fluid Sci., 22(1), 19-33(2002).
17 Quinn, W.R., “Measurements in the near flow field of an isosceles triangular turbulent free jet”, Exp. Fluids., 39(1), 111-126(2005).
18 Syred, N., “A review of oscillation mechanisms and the role of the precessing vortex core(PVC) in swirl combustion systems”, Prog. Energy Combust. Sci., 32(2), 93-161(2006).
19 Kamal, A., Gollahalli, S.R., “Effects of jet Reynolds number on the performance of axisymmetric and nonaxisymmetric gas burner flames”, J. Energy Res. Technol., 123(2), 167-172(2001).
20 Kiran, D.Y., Mishra, D.P., “Experimental studies of flame stability and emission characteristics of simple LPG jet diffusion flame”, Fuel, 86(10/11), 1545-1551(2007).
21 Renard, P.H., Thevenin, D., Rolon, J.C., Candel, S., “Dynamics of flame/vortex interactions”, Prog. Energy Combust. Sci., 26(3), 225-282(2000).
22 Yuan, C.C.L., Krstic, M., Bewley, T.R., “Active of control of jet mixing”, IEE Proc. Control Theory Appl., 151(6), 763-772(2004).
23 Hill, S.C., Smoot, L.D., “Modeling of nitrogen oxides formation and destruction in combustion systems”, Prog. Energy Combust. Sci., 26(4), 417-458(2000).
24 Yamashita, H., Nishioka, M., Takeno, T., “Prediction of NO x production rate in the turbulent diffusion flame”, Energy Convers. Manag., 38(10-13), 1343-1352(1997).

[1]	Morteza Atabati, Reza Emamalizadeh. A Quantitative Structure Property Relationship for Prediction of Flash Point of Alkanes Using Molecular Connectivity Indices [J]. Chin.J.Chem.Eng., 2013, 21(4): 420-426.
[2]	XIONG Zhihua, ZHANG Jie, DONG Jin. Optimal Iterative Learning Control for Batch Processes Based on Linear Time-varying Perturbation Model [J]. , 2008, 16(2): 235-240.
[3]	FU Dong, BAO Tiezhu, LU Jiufang, LI Yigui, LI Xiaosen. A Molecular Thermodynamic Model for Interfacial Tension in Surfactant-Oil-Water System [J]. , 2000, 2(2): 154-158.
[4]	WU Yanxiang, WANG Liangen. A New Procedure to Solve the Non-Linear Reaction-Diffusion Equation [J]. , 2000, 8(1): 92-94.
[5]	Liu Wenbin, Li Yigui, Lu Jiufang. Comparison of perturbation theory and mean spherical approximation based on molecular simulation data [J]. , 1999, 7(1): 10-19.
[6]	CONG Wei, LU Jiufang, LI Yigui. Helmholtz free energy in a system of anisotropic chainlike molecules and its applications for normal monohydric alcohols and normal alkanes [J]. , 1997, 5(2): 183-192.
[7]	YIN Qiuxiang, LI Shaofen. Estimation of overall effectiveness factors for parallel catalytic reactions [J]. , 1997, 5(2): 147-158.
[8]	ZHANG Fengbao, ZHANG Guoliang, CHEN Tao, WANG Shaoting. LUMPED-PARAMETER MODEL OF MASS TRANSFER IN HEMODIALYZER WITH ULTRAFILTRATION [J]. , 1995, 3(1): 57-62.

Flame Structure of a Jet Flame with Penetration of Side Micro-jets

Flame Structure of a Jet Flame with Penetration of Side Micro-jets

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 8

Recommended Articles

Metrics

Comments