Effect of Initial Mixture Temperature on Flame Speed of Methane-air, Propane-air and Ethylene-air Mixtures PDF Download
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Author: Gordon L. Dugger
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 30
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Book Description
Flame speeds of methane-air mixtures and ethylene-air mixtures were determined as functions of mixture composition at initial mixture temperatures ranging from 34 to 344 degrees C by a Bunsen-burner method. The data were compared with reported data for propane and air; the maximum flame speeds increased with temperature at increasing rates and were affected on the percentage basis in the decreasing order, methane, propane, and ethylene. Both a thermal and diffusion theory predicted the effect of temperature on maximum flame speed within 20 percent. Straight-line correlations were found between maximum flame speed and calculated equilibrium hydrogen-atom concentration (at adiabatic flame temperature) for each fuel.
Author: Gordon L. Dugger
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 30
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Book Description
Flame speeds of methane-air mixtures and ethylene-air mixtures were determined as functions of mixture composition at initial mixture temperatures ranging from 34 to 344 degrees C by a Bunsen-burner method. The data were compared with reported data for propane and air; the maximum flame speeds increased with temperature at increasing rates and were affected on the percentage basis in the decreasing order, methane, propane, and ethylene. Both a thermal and diffusion theory predicted the effect of temperature on maximum flame speed within 20 percent. Straight-line correlations were found between maximum flame speed and calculated equilibrium hydrogen-atom concentration (at adiabatic flame temperature) for each fuel.
Author: Gordon L. Dugger
Publisher:
ISBN:
Category : Methane flames
Languages : en
Pages : 25
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Book Description
Flame speeds were determined for methane-air, propane-air, and ethylene-air mixtures at -73 degrees C and for methane-air mixtures at -132 degrees C. The data extend the curves of maximum flame speed against initial mixture temperature previously established for the range from room temperature to 344 degrees C. Both a thermal and diffusion theory predicted the effect of low initial temperatures within approximately 20 percent, as was found previously for high initial temperatures. The low-temperature data also extended the linear correlations between maximum flame speed and calculated equilibrium active-radical concentrations, which were established by the reported high-temperature data. Flame speed was determined from the total area of the outside edge of the shadow of a nozzle flame.
Author: Gordon L. Dugger
Publisher: BiblioGov
ISBN: 9781289140793
Category :
Languages : en
Pages : 30
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Book Description
Flame speeds were determined for methane-air, propane-air, and ethylene-air mixtures at -73 C and for methane-air mixtures at -132 C. The data extend the curves of maximum flame speed against initial mixture temperature previously established for the range from room temperature to 344 C. Empirical equations for maximum flame speed u(cm/ sec) as a function of initial mixture temperature T(sub O) were determined to be as follows: for methane, for T(sub O) from 141 to 615 K, u = 8 + 0.000160 T(sub O)(exp 2.11); for propane, for T(sub O) from 200 to 616 K, u = 10 + 0.000342 T(sub O)(exp 2.00); for ethylene, for T(sub O) from 200 to 617 K, u = 10 + 0.00259 T(sub O)(exp 1.74). Relative flame speeds at low initial temperatures were predicted within approximately 20 percent by either the thermal theory as presented by Semenov or by the diffusion theory of Tanford and Pease. The same order was found previously for high initial temperatures. The low-temperature data were also found to extend the linear correlations between maximum flame speed and calculated equilibrium active-radical concentrations, which were established by the previously reported high-temperature data.
Author: United States. National Advisory Committee for Aeronautics
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 324
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Author: United States. National Advisory Committee for Aeronautics
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 886
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 750
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Author: United States. National Advisory Committee for Aeronautics
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 274
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Author: Dean R. Chapman
Publisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 852
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Book Description
The pressres acting on the base of blunt-trailing-edge airfoils have been measured at Mach numbers of 1.25, 1.5, 2.0, and 3.1 and at Reynolds numbers from 0.2 to 3.8 million. Data are presented for 29 profiles both with laminar and with turbulent boundary layers approaching the trailing edges of the wings. The base pressure is found to be a function primarily of Mach number and the ratio of the boundary layer thickeness at the trailing edge to the trailing-edge thickness.
Author: United States. National Advisory Committee for Aeronautics
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 434
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Author: Aaron S. Boksenbom
Publisher:
ISBN:
Category : Aerofoils
Languages : en
Pages : 226
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