Propagation of CH4-N2O-N2 Flames in a Closed Spherical Vessel

被引:10
作者
Mitu, Maria [1 ]
Giurcan, Venera [1 ]
Movileanu, Codina [1 ]
Razus, Domnina [1 ]
Oancea, Dumitru [2 ]
机构
[1] Romanian Acad, Ilie Murgulescu Inst Phys Chem, 202 Spl Independentei, Bucharest 060021, Romania
[2] Univ Bucharest, Dept Phys Chem, 4-12 Blvd Regina Elisabeta, Bucharest 030018, Romania
关键词
laminar combustion velocity; propagation speed; methane; nitrous oxide; closed cell combustion; LAMINAR BURNING VELOCITY; NITROUS-OXIDE; FLAMMABILITY LIMITS; NITRIC-OXIDE; PRESSURE; HYDROGEN; METHANE; MIXTURES; EXPLOSION; SPEEDS;
D O I
10.3390/pr9050851
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Flammable fuel-N2O mixtures raise safety and environmental protection issues in areas where these mixtures are used (such as: industry, research, internal combustion engines). Therefore, it is important to know their laminar combustion velocities and propagation speeds-important safety parameters for design of active protection devices against gas explosions and corresponding safety recommendations. In this paper, the laminar combustion velocities of N-2-diluted CH4-N2O flames, obtained in experiments on outwardly propagating flames, at various initial pressures (within 0.5-2.0 bar) and room temperature, are reported. The experiments were made in a 0.5 L spherical cell with central ignition. The laminar combustion velocities were calculated from the constants of cubic law of flame propagation during the early stage of closed cell explosions and the expansion coefficients of unburned flammable mixtures, using the adiabatic model of the flame propagation. The expansion coefficients were determined from equilibrium calculations on flames propagating under isobaric conditions. The laminar combustion velocities were compared with data reported in the literature. Using the laminar combustion velocities and the expansion coefficients, the propagation speeds of N-2-diluted CH4-N2O flames were calculated. Both laminar combustion velocities and propagation speeds decrease with the initial pressure increase.
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页数:14
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