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Methane/hydrogen fuels are widely applied in the internal combustion engine and gas turbine due to enhanced laminar burning velocity and extended flammability limits. In order to ensure energy utilization in safety, the flame characteristics and explosion pressure in the lean, stoichiometric and rich mixture are investigated systematically by varying hydrogen addition and initial pressure. In the...
Particle size has significant effect on flame propagation behaviors in dust explosions. In this study, the flame propagation behaviors and microstructures in micro- and nano-titanium dust explosions were observed and compared. Results showed that flame propagation mechanisms in 50nm and 35μm titanium dust clouds were quite different. 50nm titanium dust flame was characterized by discrete single glowing...
Spontaneous ignition and subsequent flame propagation of high-pressure hydrogen release via a tube into air are experimentally investigated using pressure records, flame detection and direct high-speed photographs. The study shows that as the burst pressure increases the likelihood of spontaneous ignition increases and the initial ignition is closer to the burst disk. With the increase of tube length,...
This study investigated the effects of Fe3O4 coating ratios on the characteristics of flame propagation in dust clouds of 38-μm zirconium particles. A high-speed observation system, fine thermocouples, scanning electron microscopy and X-ray photoelectron spectroscopy were used to reveal the flame propagation behaviors, velocities, temperatures and reaction mechanisms in detail. The results showed...
To reveal clearly the effects of particle thermal characteristics on flame structures during organic dust explosions, the flame structures in the dust clouds and liquid mist observed during the combustion of several long-chain monobasic alcohols in an open space chamber were recorded using an approach combining high-speed photography and a band-pass filter. From direct-light-emission photographs and...
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