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Flame behavior and thermal structure of combusting plane jets with and without self-excited transverse oscillations

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Abstract

The flame behavior and thermal structure of combusting plane jets with and without self-excited transverse oscillations were investigated experimentally. The transversely-oscillating plane jet was generated by a specially designed fluidic oscillator. Isothermal flow patterns were observed using the laser-assisted smoke flow visualization method. Meanwhile, the flame behaviour was studied using instantaneous and long-exposure photography techniques. Temperature distributions and combustion-product concentrations were measured using a fine-wire type R thermocouple and a gas analyzer, respectively. The results showed that the combusting transversely-oscillating plane jets had distributed turbulent blue flames with plaited-like edges, while the corresponding combusting non-oscillating plane jet had laminar blue-edged flames in the near field. At a high Reynolds number, the transversely-oscillating jet flames were significantly shorter and wider with shorter reaction-dominated zones than those of the non-oscillating plane jet flames. In addition, the transversely-oscillating combusting jets presented larger carbon dioxide and smaller unburned hydrocarbon concentrations, as well as portrayed characteristics of partially premixed flames. The non-oscillating combusting jets presented characteristics of diffusion flames, and the transversely-oscillating jet flame had a combustion performance superior to its non-oscillating plane jet flame counterpart. The high combustion performance of the transversely-oscillating jets was due to the enhanced entrainment, mixing, and lateral spreading of the jet flow, which were induced by the vortical flow structure generated by lateral periodic jet oscillations, as well as the high turbulence created by the breakup of the vortices.

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Abbreviations

b :

Width of exit slots of fluidic oscillator, 0.5 mm.

C CO :

Concentrations of carbon monoxide.

C CO2 :

Concentrations of carbon dioxide.

C O2 :

Concentrations of oxygen.

C UHC :

Concentrations of unburned hydrocarbons.

d :

Width of fluidic oscillator passageway, 1 mm.

d p :

Width of jet exit, 11 mm.

h :

Offset distance from crescent origin to virtual vertex of target blockage, 2 mm.

H f :

Flame length, m.

l :

Length of deflection plates, 5.5 mm.

Q j :

Volumetric flow rate of fluid jet measured by rotameter, m3/s.

R :

Radius of crescent profile of the target blockage, 4.5 mm.

Rej :

Reynolds number of fuel jet flow, = u j d p/ν j.

s :

Span length of burners, 36 mm.

T :

Temperature, °C.

t :

Evolution time, s.

t* :

Non-dimensional evolution time, = tu c/d p.

UHC:

Unburned hydrocarbons.

u c :

Average jet velocity at the nozzle inlet, m/s.

u j :

Average exit velocity of plane jet, = Q j/(sd p ), m/s.

u’ :

Root mean square of fluctuating velocity, m/s.

w :

Cross-stream distance between exit slots of fluidic oscillator, 16.4 mm.

w b :

Downstream width of target blockage, 15 mm.

W b :

Overall width of burners, 36 mm.

W f :

Flame width, m.

x, y, z :

Coordinates in lateral, span, and axial directions fixed at centre of burner exit plane.

θ :

Deflection angle of deflection plates measured from horizontal axis, 30 degrees.

ν j :

Kinematic viscosity of jet fluid, m2/s

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Authors and Affiliations

  1. National Taiwan University of Science and Technology, Taipei, 10672, Taiwan, Republic of China

    Rong Fung Huang & Reuben Mwanza Kivindu

  2. National Formosa University, Yunlin County, 63246, Taiwan, Republic of China

    Ching Min Hsu

Authors
  1. Rong Fung Huang
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Correspondence to Rong Fung Huang.

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Huang, R.F., Kivindu, R.M. & Hsu, C.M. Flame behavior and thermal structure of combusting plane jets with and without self-excited transverse oscillations. Heat Mass Transfer 54, 1681–1696 (2018). https://doi.org/10.1007/s00231-017-2268-0

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