Rich Flammability Limits in CH3OH/CO/diluent Mixtures PDF Download
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Author: Mary N. Sandia National Labs Bui-Pham (Combustion Research Facility [email protected]) Publisher: ISBN: Category : Chemical plants Languages : en Pages : 12
Book Description
This research, a joint project between Sandia National Laboratories/California and Dow Chemical Company/Midland, is intended to examine existing flame modeling capability developed at Sandia to model experimental data for rich flammability limits. System studied is methanol/carbon monoxide/diluent mixtures, where the diluent is either nitrogen or carbon dioxide at pressures of 1, 11, and 21 atm, respectively. Critical oxygen concentration needed to sustain a flame was measured in a spherical vessel with a central ignition source for several mixtures and pressures. Burning velocities of 1-D, planar, freely propagating premixed flames were calculated to determine minimum oxygen concentration required for these flames to propagate. This minimum O[sub 2] concentration was found to be consistently larger than that observed in experiments; however, effects of pressure and diluent composition agreed well with experimental data. Attempts were made to model the spherical vessel experiment directly, which resultd in qualitative agreement with experimental data and steady flame predictions. In addition, the rich flammability limit was calculate for pure methanol-air flames to be at an equivalence ratio of [approximately] 2.1, and extincton occurs at K[sub ex] =1670 sec[sup [minus]1] for the opposed-flow, strained, stoichiometric methanol-air case.
Author: Mary N. Sandia National Labs Bui-Pham (Combustion Research Facility [email protected]) Publisher: ISBN: Category : Chemical plants Languages : en Pages : 12
Book Description
This research, a joint project between Sandia National Laboratories/California and Dow Chemical Company/Midland, is intended to examine existing flame modeling capability developed at Sandia to model experimental data for rich flammability limits. System studied is methanol/carbon monoxide/diluent mixtures, where the diluent is either nitrogen or carbon dioxide at pressures of 1, 11, and 21 atm, respectively. Critical oxygen concentration needed to sustain a flame was measured in a spherical vessel with a central ignition source for several mixtures and pressures. Burning velocities of 1-D, planar, freely propagating premixed flames were calculated to determine minimum oxygen concentration required for these flames to propagate. This minimum O[sub 2] concentration was found to be consistently larger than that observed in experiments; however, effects of pressure and diluent composition agreed well with experimental data. Attempts were made to model the spherical vessel experiment directly, which resultd in qualitative agreement with experimental data and steady flame predictions. In addition, the rich flammability limit was calculate for pure methanol-air flames to be at an equivalence ratio of [approximately] 2.1, and extincton occurs at K[sub ex] =1670 sec[sup [minus]1] for the opposed-flow, strained, stoichiometric methanol-air case.
Author: Mary N. Bui-Pham Publisher: ISBN: Category : Chemical plants Languages : en Pages : 22
Book Description
This research, a joint project between Sandia National Laboratories/California and Dow Chemical Company/Midland, is intended to examine existing flame modeling capability developed at Sandia to model experimental data for rich flammability limits. System studied is methanol/carbon monoxide/diluent mixtures, where the diluent is either nitrogen or carbon dioxide at pressures of 1, 11, and 21 atm, respectively. Critical oxygen concentration needed to sustain a flame was measured in a spherical vessel with a central ignition source for several mixtures and pressures. Burning velocities of 1-D, planar, freely propagating premixed flames were calculated to determine minimum oxygen concentration required for these flames to propagate. This minimum O[sub 2] concentration was found to be consistently larger than that observed in experiments; however, effects of pressure and diluent composition agreed well with experimental data. Attempts were made to model the spherical vessel experiment directly, which resultd in qualitative agreement with experimental data and steady flame predictions. In addition, the rich flammability limit was calculate for pure methanol-air flames to be at an equivalence ratio of [approximately] 2.1, and extincton occurs at K[sub ex] =1670 sec[sup [minus]1] for the opposed-flow, strained, stoichiometric methanol-air case.
Author: Publisher: ISBN: Category : Languages : en Pages : 22
Book Description
This research, a joint project between Sandia National Laboratories/California and Dow Chemical Company/Midland, is intended to examine existing flame modeling capability developed at Sandia to model experimental data for rich flammability limits. System studied is methanol/carbon monoxide/diluent mixtures, where the diluent is either nitrogen or carbon dioxide at pressures of 1, 11, and 21 atm, respectively. Critical oxygen concentration needed to sustain a flame was measured in a spherical vessel with a central ignition source for several mixtures and pressures. Burning velocities of 1-D, planar, freely propagating premixed flames were calculated to determine minimum oxygen concentration required for these flames to propagate. This minimum O2 concentration was found to be consistently larger than that observed in experiments; however, effects of pressure and diluent composition agreed well with experimental data. Attempts were made to model the spherical vessel experiment directly, which resultd in qualitative agreement with experimental data and steady flame predictions. In addition, the rich flammability limit was calculate for pure methanol-air flames to be at an equivalence ratio of (approximately) 2.1, and extincton occurs at K{sub ex} =1670 sec−1 for the opposed-flow, strained, stoichiometric methanol-air case.
Author: Publisher: ISBN: Category : Languages : en Pages : 27
Book Description
The literature related to the flammability and explosion limits of H2/O2,H2/O2/diluent, CO/H2/O2, and CO/H2/air mixtures is reviewed, with particular attention to those aspects relevant to space- and launch vehicle- related conditions. The discussion is hardly exhaustive but is meant to be reasonably self-contained. Applications to a recent Atlas II AC-101 booster system exhaust leak are considered.
Author: Mary N. Sandia National Labs Bui-Pham (Combustion Research Facility [email protected])
Author: Mary N. Sandia National Labs Bui-Pham (Combustion Research Facility 
Author: Mary N. Bui-Pham
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