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Revista de Chimie (Rev. Chim.), Year 2007, Volume 58, Issue 12,





Pressure Evolution during Confined Deflagration
of n-Butane/Air Mixtures

Abstract:

The peak pressures pmax, the maximum rates of pressure rise (dp/dt)max and the times necessary to reach the peak pressure qmax of n-butane-air deflagrations in two closed vessels with central ignition (a spherical vessel of 5 cm diameter and a cylindrical vessel with height h = 15 cm and diameter F = 10 cm) are reported, for mixtures with variable fuel content (2.3 - 5.7 vol.%) and initial pressures p0 = 0.4 - 1.2 bar, at ambient initial temperature. Adiabatic values of explosion pressures, calculated for all mixtures at p0 = 1 bar and T0 = 298 K, are examined against experimental values of explosion pressures observed in the two vessels. The deflagration index KG, characteristic to deflagrations in vessels with volume V and central ignition, is calculated as and examined against composition of flammable mixtures. All characteristic parameters of the closed vessel combustion of n-butane-air mixtures have extreme values in the concentration range 3.8 - 4.2 vol.% (equivalence ratio 1.1 - 1.2). The obtained results are discussed in connection with mixture composition and pressure. Keywords: combustion, deflagration, n-butane, explosion pressure, maximum rate of pressure rise


Issue: 2007, Volume 58, Issue 12
Pages:
Publication date: 2001/1/1
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