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2023 Vol.28, Issue 4 Preview Page

Research Article

An Experimental Study on Turbulent Characteristics of Hybrid Type Fractal Grid Flames

하이브리드타입 프랙탈격자 화염의 난류특성에 관한 실험적 연구

Jung Hyun Kim1
,
Kee Man Lee1†
김 정현1
,
이 기만1†
1School of Mechanical and Aerospace Engineering/Center for Aerospace Engineering Research, Sunchon National University
1순천대학교 기계우주항공공학부/우주항공연구센터
*Corresponding Author
31 December 2023. pp. 43-53
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Abstract

This study focuses on the V-shape with hybrid type fractal grid generator to evaluate the turbulent characteristics of turbulent premixed flames. In this work, the mean and velocity fluctuation, turbulence intensity were investigated. The integral length scale of non-reactive flow was additionally investigated to obtain a Borghi-Peters diagram. By comparing the Borghi-Peters diagram shown as a result of the non-reactive flow based with the reaction OH-PLIF images, it was confirmed that the flame characteristics of each regimes in fractal grid flames were well represented. Also, the irreguar turbulence of premixed flames was quantitatively analyzed using the flame brushes obtained by the mean progress variable analysis. As a result, the flame brushes of the hybrid type fractal turbulence generator were wider than the conventional fractal grid generator with individuial shape of cross and square grid. This means that the turbulence intensity has increased compared to the previous conventional fractal grid, and the local displacement speed is also expected to increase.it has increased compared to the existing fractals of the hybrid type, and the local displacement speed is also expected to increase.

Keywords
V-shape flame
Hybrid fractal grid
OH-PLIF
Mean progress variable
References
1
P. Tamadonfar, and O. L. Gulder, Effects of mixture composition and turbulence intensity on flame front structure and burning velocities of premixed turbulent hydrocarbon/air Bunsen flames, Combust. Flame 162 (2015) 4417-4441. 10.1016/j.combustflame.2015.08.009
2
S. Kheirkhah and Ö. L. Gülder, Turbulent premixed combustion in V-shaped flames: Characteristics of flame front, Phys. Fluid 25, 055107, 2013. 10.1063/1.4807073
3
S. Kheirkhah and Ö. L. Gülder, Consumption speed and burning velocity in counter-gradient and gradient diffusion regimes of turbulent premixed combustion, Combust. Flame 162, 2015, 1422-1439. 10.1016/j.combustflame.2014.11.009
4
D. Hurst, and J.C. Vassilicos, Scalings and decay of fractal-generated turbulence, Phys. Fluids 19, 035103, 2007. 10.1063/1.2676448
5
J.H. Kim, K.M. Lee, Analysis of Turbulent Premixed Flames in V-shape Flames with Fractal Turbulence Generators : Part. I Turbulent Flow characteristics in a Non-Reacting Field, J.Korean Soc. Combust. 26(2), 2021, 53-69 10.15231/jksc.2021.26.2.053
6
S. Kheirkhah, Ö. L. Gülder, Topology and Brush Thickness of Turbulent Premixed V-shape Flames, Flow Turbulence Combust. 93, 2014, 439-459. 10.1007/s10494-014-9563-3
7
P. Langevin, Sur la théorie du mouvement brownien. C. R. acad. Sci. Paris 146, 1908, 530-533.
8
S.B. Pope, Turbulent Flows. Cambridge University Press, 2000. 10.1017/CBO9780511840531
9
G.I. Taylor, Diffusion by continuous movements, Proc. Lond. Math. Soc. 20, 1922, 196-212. 10.1112/plms/s2-20.1.196
10
N. Peters. Turbulent combustion. cambride University Press, first edition, 2000. 10.1017/CBO9780511612701
11
T. Sponfeldner, N. Soulopoulos, F. Beyrau, Y. Hardalupas, A.N.K.P. Taylor, J.C. Vassilicos, The structure of turbulent flames in fractal- and regular- grid generated turbulence, Combust. Flame 172, 2015, 3379-3393. 10.1016/j.combustflame.2015.06.004
12
R.K. Cheng, D.T. Yegian, M.M. Mivasato, G.S. Samuelsen, C.E. Benson, R. Pellizzar i, R. Loftus, Scaling and Development of Low-Swirl Burners for Low-Emission Furnaces and Boilers, Proc. combust. Inst., 28, 2000, 1305-1313. 10.1016/S0082-0784(00)80344-6
13
T. Yegian, R.K. Cheng, Developmet of a Vane- Swirler for use in a Low NOx Weak-swirl Burner, AFRC, 1996, (LBNL-39354)1-20. 10.2172/414339
14
M.R. Johnson, D. Littlejohn, W.A. Nazeer, K.O. Smith, R.K. Cheng, A Comparison of the Flow fields and Emissions of High-swirl Injectors and Low-swirl Injectors for Lean Premixed Gas Turbines, Proc. Combust. Inst., 30(2), 2005, 2867-2874. 10.1016/j.proci.2004.07.040
15
A.A. Verbeek, P. A. Willems, G.G.M. Stoffels, B.H. Geurts, T. H. van der Meer, Enhancement of turbulent flame speed of V-shaped flames in fractal- grid generated turbulence, Combust. Flame, 167, 2016, 97-112. 10.1016/j.combustflame.2016.02.022
16
B. Bedat, R.K. Cheng, Experimental Study of Premixed Flames in Intense Isotropic Turbulence, Combust. Flame, 100, 1995, 485-494 10.1016/0010-2180(94)00138-I
17
R.K. Cheng, Velocity and Scalar Characteristics of Premixed Turbulent Flames Stabilized By Weak Swirl, Combust. Flame, 101 (1995) 1-14. 10.1016/0010-2180(94)00196-Y
18
H. Jeong, M. Han, K. Kang, Y. Lee, K. Lee, An experimental Study on the Effect of a Turbulence Generating Plate in Low Swirl Combustor. J. Mech. Sci. Technol., 31 (12) (2017) 6077-6084. 10.1007/s12206-017-1152-7
19
P.L. Therkelsen, D. Littlejohn, R.K. Cheng, Para- metric study of low swirl injector geometry on its operability, ASME, GT20112-6846 (2012) 1-10. 10.1115/GT2012-68436
20
J.H. Kim, K.M. Lee, Analysis of Turbulent Premixed Flames in V-shape Flames with Fractal Turbulence Generators : Part. Ⅱ Turbulent of Turbulent Flame Structures, J.Korean Soc. Combust. 26(3) (2021) 51-61 10.15231/jksc.2021.26.3.051
21
J.H. Kim, K.M. Lee, Analysis of Turbulent Premixed Flames in V-shape Flames with Fractal Turbulence Generators : Part. Ⅲ Turbulent Burning Velocity, J.Korean Soc. Combust. 26(2) (2021) 53-69 10.15231/jksc.2021.26.2.053
22
N. Mazellier, J. C. Vassilicos, Turbulence without Richardson-Kolmogorov cascade, Phys. Fluids 22(7) (2010) 075101 10.1063/1.3453708
23
P.C. Valente, J.C. Vassilicos, The decay of turbulence generated by a class of multiscale grids, J. Fluid Mech. 687 (2011) 300-340 10.1017/jfm.2011.353
24
Y.S.Kang, K.M.Lee, The study of Turbulent Flame Characteristics by Plate Shape of Turbulence Generator, J.Korean Soc. Combust. 26(3) (2021) 20-34. 10.15231/jksc.2021.26.3.020
Information
  • Publisher :The Korean Society Combustion
  • Publisher(Ko) :한국연소학회
  • Journal Title :Journal of The Korean Society Combustion
  • Journal Title(Ko) :한국연소학회지
  • Volume : 28
  • No :4
  • Pages :43-53
  • Received Date : 2023-12-11
  • Revised Date : 2023-12-28
  • Accepted Date : 2023-12-28
  • DOI :https://doi.org/10.15231/jksc.2023.28.4.043
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