Analysis of Turbulent Burning Velocity of Spherically Propagating Premixed Flame with Effective Turbulence Intensity

Hayakawa, Akihiro; Miki, Yukito; Nagano, Yukihide; Kitagawa, Toshiaki

doi:10.1299/jtst.7.507

Cited by 12 publications

(14 citation statements)

References 25 publications

(28 reference statements)

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“…Experiments of laminar and turbulent explosions were carried out using the constant volume combustion vessel outlined schematically in Fig. 1 (3) . The combustion chamber was comprised of three 265 mm diameter cylinders which intersected orthogonally.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…In the turbulent explosions, turbulence intensity, u' was set to 1.23 and 2.46 m/s. The characteristics of turbulence in the chamber were evaluated by particle image velocimetry (PIV) by the same manner done by Hayakawa and Kitagawa et al (3) . Longitudinal integral length scales of turbulence, Lf was 27.96 mm irrespective of the turbulence intensity.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…The laminar burning velocity un is generally varied from the unstretched laminar burning velocity ul due to the flame stretch. For spherically propagating flames, the flame stretch rate,  can be calculated by flame radius, rsch (1), (3) .…”

Section: (A) Becausementioning

confidence: 99%

“…On the other hand, turbulent flame is subjected by the thermo-diffusive effects due to the flame stretch which is caused by the turbulent eddies (1), (3) . Local burning velocity of the flamelet is considered to vary from the unstretched laminar burning velocity.…”

Section: Introductionmentioning

confidence: 99%

“…Kitagawa showed the ratio of the turbulent burning velocity to the unstretched laminar burning velocity varied with the fuel concentration even at a fixed intensity and length scale of turbulence. Furthermore, this tendency depends on the type of fuel (3),( 7)- (10) .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Propagation Properties of Turbulent Premixed Flames Neutral for Thermo-Diffusive Effects

Kitagawa

Watanabe

Nishiyama

et al. 2020

IJAE

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Burning velocity is one of the important properties of premixed turbulent flames. Premixed turbulent flames are, in general, subjected to the thermo-diffusive effects in addition to the increase in the flame front area due to the influence of turbulence. In order to independently evaluate these two effects on turbulent flames and their burning velocity, ethane flames, which have a Lewis number around unity and can therefore be considered insensitive to the thermo-diffusive effects, were examined. Flame front morphologic properties such as a Fractal dimension were obtained by Fractal analysis of flame front tomography, and burning velocity was obtained by Schlieren technique. A novel correlation of turbulent burning velocity with Fractal properties of flame front was proposed.

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Section: Experimental Apparatusmentioning

confidence: 99%

Section: Experimental Apparatusmentioning

confidence: 99%