The explosion venting duct can effectively reduce the hazard degree of a gas explosion and conduct the venting energy to the safe area. To investigate the flame quantitative propagation law of explosion venting with a duct, the effects of hydrogen fraction and explosion venting duct length on jet flame propagation characteristics of premixed H2-air mixtures were analyzed through experiment and simulation. The experiment results under initial conditions of room temperature and 1 atm show that when hydrogen fraction was high enough, part of the unburned hydrogen was mixed with air again to reach an ignitable concentration, resulting in the secondary combustion was easier produced and the duration of the secondary flame increased. With the increase of venting duct length, the flame front distance and propagation velocity increased. Meanwhile, the spatial distribution of pressure field and temperature field, and the propagation process and mechanism of the flame venting with a duct were analyzed using FLUENT software. The variation of the pressure wave and the pressure reflection oscillation law in the explosion venting duct was captured. Therefore, in the industrial explosion venting design with a duct, the hazard caused by the coupling of venting pressure and venting flame under different fractions should be considered comprehensively. 相似文献
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Through scanning electron microscope (SEM), spectral analysis, and component analysis tests, the interaction theory between
asphalt and rubber was discussed. It is concluded that rubber powder become soft and bond together with each other after being
mixed with asphalt. The asphalt changes from a smooth homogeneous matter to a continuous mixing system which is composed of
rubber powder and asphalt. The interaction is mainly physical diffusion, but there are some chemical reactions in the process,
especially at long reaction time. 相似文献
Microsystem Technologies - A novel piezoelectric inertial actuator is developed in this paper, to realize the requirements of large stroke and high output displacement accuracy. This proposed... 相似文献