Journal ArticleDOI
Characteristics of laminar gas jet diffusion flames under the influence of elevated gravity
Robert A. Altenkirch,R. Eichhorn,N.N. Hsu,A. B. Brancic,N.E. Cevallos +4 more
- Vol. 16, Iss: 1, pp 1165-1174
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TLDR
In this article, the role of buoyancy in laminar gas jet diffusion flames of hydrogen, methane, ethane, and propane, stabilized on small cylindrical burners, was investigated at elevated gravity in a centrifuge.Abstract:
Laminar gas jet diffusion flames of hydrogen, methane, ethane, and propane, stabilized on small cylindrical burners, were studied at elevated gravity in a centrifuge to investigate the role of buoyancy in such flames. Photographic observation of the hydrocarbon flames indicated that length and carbon luminosity decreased with increasing buoyancy. These flames eventually separated from the burner rim and finally extinguished as gravity increased. Hydrogen flames, however, did not separate or extinguish up to about 31 times earth normal gravity. Length data are reported and interpreted with the aid of a simplified model which describes the flame as a heated vertical cylindrical sheet to which oxygen is supplied by a free convection boundary layer.read more
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Journal ArticleDOI
Ignition and behavior of laminar gas-jet diffusion flames in microgravity
TL;DR: In this paper, the results of studies on the ignition and behavior of cylindrically symmetric, laminar diffusion flames of methane and propane in quiescent air under microgravity conditions were presented.
Journal ArticleDOI
Effects of buoyancy on gas-jet diffusion flames: Experiment and theory☆
R.B. Edelman,M. Y. Bahadori +1 more
TL;DR: Theoretical and experimental research on the effects of buoyancy on gas-jet diffusion flames is described in this article, where the results show that uncertainties in the current understanding of flame structure exist and further research is required before reliable predictions of ignition, stabilization, and propagation of flames under microgravity conditions can be made.
Journal ArticleDOI
Impact of CO2, N2 or Ar diluted in air on the length and lifting behavior of a laminar diffusion flame
Jiesheng Min,Françoise Baillot,Hongsheng Guo,Eric Domingues,M. Talbaut,Béatrice Patte-Rouland +5 more
TL;DR: In this article, air-side dilution on laminar methane/air diffusion flames in the buoyant regime was extensively studied and two flame response categories were highlighted, depending on whether mechanisms relied on several effects or mainly on pure dilution.
Effects of buoyancy on gas jet diffusion flames
TL;DR: In this article, the effects of gas jet diffusion flames in the absence of buoyancy were studied in the 2.2 Second Drop Tower and the 5.18-Second Zero-Gravity Facility of NASA LeRC.
Journal ArticleDOI
Isolation of Buoyancy Effects in Jet Diffusion Flame Experiments
TL;DR: In this article, a simple procedure for varying in isolation the relative buoyancy force in stationary laboratory jet diffusion flame experiments is described, which is derived from a theoretical model of these flames, merely requires that background pressure be varied while maintaining constant mass flows of fuel and oxidizer into the burner.
References
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Journal ArticleDOI
Flammability limits: an invited review
TL;DR: In this article, the authors deal with problems of flammability limits for gaseous mixture, the theory of convective FLAMB, near-limit phenomena in large vessels, inhibition of FLAMBP limits, deflation of the falmmability limit, certain aspects of ignition, and flammable limits at high pressures and temperatures.
Journal ArticleDOI
First-Order Perturbations of Laminar Free-Convection Boundary Layers on a Vertical Plate
Kwang-Tzu Yang,Edward W. Jerger +1 more
Journal ArticleDOI
Transpiration and natural convection: the vertical-flat-plate problem
TL;DR: In this paper, a study of the natural convective flow which is induced in an infinite expanse of gas by the presence of a vertical hot flat plate from which hot gas of the same chemical type is being blown is made.
Journal ArticleDOI
Stable Hydrocarbon Diffusion Flames in a Weightless Environment
TL;DR: In this article, an experimental investigation of stable laminar ethylene and propylene diffusion flames burning on a nozzle in weightlessness was performed at the NASA-Lewis 2.2 Second Drop Tower.
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