Combustion parameters of gaseous epoxypropane/air in a confined vessel

Propellants Explo Pyrotec

2017

This article presents a comparison of the explosion characteristics of mixtures of isopropyl nitrate (IPN, (CH 3 ) 2 CHONO 2 ) and JP-10 (C 10 H 16 , tricycle [5.2.1.0 2,6 ] decane) in air aerosols. The explosion pressure, flame temperature, maximum rate of pressure rise, maximum rate of temperature rise, and lower flammability limits (LFLs) were measured for two sets of IPN and mixed IPN/JP-10 in air aerosols at different concentrations and Sauter mean diameters (SMDs) of 19 mm and 34 mm, respectively, and the values were compared with the experimental results of JP-10/air aerosols with SMDs of 20 mm and 35 mm (from our previous research). Experiments were also performed to study various concentrations at various ignition energies for the IPN/ air aerosols and the explosions of binary mixture aerosols with various mass ratios of IPN and JP-10. The experimental results indicated that for the IPN/air and JP-10/air aerosols with a mean SMD of~34 mm, the maximum peak pressure and maximum peak temperature of the IPN/air aerosols were greater than those of the JP-10/air aerosols. The maximum rate of pressure rise of the IPN/air aerosols reached a maximum value of 395.3 MPa/s at a mean SMD of~34 mm, and the pressure increased more abruptly in the IPN/air aerosols than in the JP-10/air aerosols. The LFLs of the IPN/air aerosols occurred with a total concentration of 197 g/m 3 at a mean SMD of 19 mm and a total concentration of 233 g/ m 3 at a mean SMD of 34 mm, whereas the LFLs for the JP-10/air aerosols with SMDs of 20 mm and 35 mm were less than 47 g/m 3 and 40 g/m 3 , respectively. The experimental results presented here also showed that the maximum peak pressure was 1.07 MPa at a binary liquid mass ratio of IPN:JP-10 (%) of 72 : 28 and a mean SMD of~34 mm.Keywords: IPN/air and JP-10/air aerosols · Explosion characteristics · Lower flammability limit · Ignition energy · Various mass ratios of binary mixtures 2 3 4 5 6 7 8

Section: Explosion Pressures and Flame Temperaturesmentioning

confidence: 99%

A Comparative Study of the Explosion Characteristics of IPN and IPN/JP‐10 Mixtures in Air Aerosols

Propellants Explo Pyrotec

2017

“…The electrode diameter used in the experiments was 5 mm. The device of spark ignition energy can be found in previous references. − In three transparent windows, the Mie extinction detection system was placed at the positions 1/5, 1/2, and 4/5 of the vessel. The double-nozzle pneumatic atomization system, the optical particle size and concentration detection system, and the electric ignition system were controlled by a central control system and set to different trigger times in each experiment.…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

“…The frequency response of each system was above 20 kHz. A description of the data-acquisition system with the pressure and temperature can be found in previous references. − …”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

Influence of Vapor–Liquid Two-Phase n-Hexane/Air Mixtures on Flammability Limit and Minimum Ignition Energy

Zhang

2014

Ind. Eng. Chem. Res.

Self Cite

The aim of this work was to provide new experimental data on the influence of vapor−liquid two-phase n-hexane/ air mixtures on the lower flammability limit (LFL) and minimum ignition energy (MIE). A series of experiments was carried out as follows: (1) A set of vapor−liquid two-phase n-hexane/air mixtures of various concentrations was obtained at the mean Sauter mean diameter (SMD) of 10.63 μm and the 80-ms ignition moment in the vessel. The errors were analyzed. (2) Experiments were implemented on vapor−liquid two-phase n-hexane/air mixtures of various concentrations at an ignition energy of 28 J and the initial room temperature and pressure of 21 °C and 0.10 MPa, respectively. The effects of the concentration of n-hexane on the explosion pressure, explosion temperature, and LFL were analyzed, and the results are discussed. (3) A series of experiments was implemented on vapor−liquid two-phase n-hexane/air mixtures of various concentrations at various ignition energies. The MIE of the vapor−liquid two-phase n-hexane/air mixture was 0.5 mJ in this work, and the results are discussed. Article pubs.acs.org/IECR

“…Knowledge of the characteristics of the flammable saturated methanol vapor/O 2 /N 2 mixtures is an important prerequisite for proper usage. Although a great deal of research effort has been directed toward determining the explosion parameters of flammable gases, − the flammability limits of gas mixtures, − and the effects of the initial temperature and pressure on the explosion parameters, − unfortunately, few researchers have paid attention to the COCs of saturated methanol vapor/O 2 /N 2 mixtures at pressures and/or temperatures different from ambient. Consequently, in this work, we have used a COC measurement system consisting of a 4-L explosion vessel, an ignition subsystem, and a transient pressure measurement subsystem.…”

Section: Introductionmentioning

confidence: 99%

Critical Explosible Oxygen Concentration of Methanol-Saturated Vapor/O₂/N₂ Mixtures at Elevated Temperatures and Pressures

Huang

et al. 2014

Ind. Eng. Chem. Res.

Self Cite

The critical oxygen concentration (COC) in this study is defined as the maximum oxygen concentration at which a mixture of methanol vapor in nitrogen does not explode, regardless of the nitrogen concentration in the mixture. This paper presents data on the critical oxygen concentration (COC), in the presence of added N2, of methanol (CH4O) saturated vapor mixtures at elevated temperature and pressure. We have used a COC measurement system consisting of a 4-L explosion vessel, an ignition subsystem, and a transient pressure measurement subsystem. Through a series of experiments carried out in this system, the COCs of methanol-saturated vapor/O2/N2 mixtures at different initial pressures and an elevated temperature of 80 °C have been studied, and the influence of concentration of nitrogen on the COC has been analyzed and discussed. Variation of the initial pressure within the studied range was found to have significant effect on the COCs of the methanol saturated vapor/O2/N2 mixtures. There is a very large difference between the COCs (or CNCs) of the methanol-saturated vapor/O2/N2 mixtures at the elevated temperature and pressure and those of methanol vapor in air at atmospheric pressure and room temperature. The COCs of the methanol-saturated vapor/O2/N2 mixtures with the initial temperature of 80 °C at the initial pressure of 0.5, 0.4, and 0.3 MPa are 36, 28, and 21 vol %, respectively. The corresponding CNCs at initial pressures of 0.5, 0.4, and 0.3 MPa are 54, 59.5, and 62 vol %, respectively.