Experimental study on the combustion characteristics of oil and gas in a 20 L closed spherical tank
The combustion test of RP-3 aviation kerosene vapor was conducted in a 20 L closed spherical tank.The flame propagation characteristics of RP-3 aviation kerosene vapor were investigated under initial temperatures of 400 K,initial pressures ranging from 40 kPa to 140 kPa,and equivalence ratios ranging from 0.7 to 1.5.The spherical flame method was used to calculate the propagation speed of unstretched laminar flames,the propagation speed of stretched laminar flames,and the laminar burning velocity under different operating conditions.The influence of initial pressure and equivalence ratio on flame propagation was analyzed,and the morphological characteristics of flame development were studied with ignition position as a variable.The results show that flames within the sphere progressively spread,with the radius of the flames continually expanding.The flame surface adjacent to the inner wall of the explosion sphere displays characteristic wrinkling.The unstretched laminar flame propagation speed,stretched laminar flame propagation speed,and laminar burning velocity of RP-3 aviation kerosene first increase and then decrease with the increase of equivalence ratio,reaching their maximum values at an equivalence ratio of 1.1.As the aviation kerosene combustion progresses from lean to rich fuel conditions,the flame development does not assume a perfectly symmetrical"n"shape,peaking at the 1.1 conditions,but displays greater speed and flame radius on the"left"side.As initial pressure increases,the unstretched laminar flame propagation speed,stretched laminar flame propagation speed,and laminar burning velocity of RP-3 aviation kerosene exhibit a negative trend.The flame color deepens with increasing density.Flame development at different ignition points displays similar patterns.The flame front divides the flow field into burned and unburned areas.As the flame front expands,thermal diffusion instability and buoyancy instability exacerbate the hydrodynamic instability affecting the flame surface,leading to enhanced flame instability.When the ignition position deviates from the center,a typical cellular structure emerges on the flame surface.
safety engineeringRP-320 L closed spherical tanklaminar burning velocityinfluencing factorsflame instability
万方数据
维普
