Study on the influence of explosion venting position on the explosion turbulence for industrial bend pipe
To study the influence of explosion venting from a bend on the gas explosion in a pipeline,experimental test and numerical simulation of gas explosion under different venting conditions based on FLACs were carried out in terms of the pipeline model with an inner diameter of 0.125 m,followed by the calculation and analysis of the variation law of turbulence inside and outside pipeline.Results show that for the monitoring point at the pipe which is 4.8 m away from the ignition point,the peak value of the turbulent kinetic energy is 5 745.42 m2/s2 under gas explosion scenario without venting.With venting,its peak value increases by 8.4％,showing an obvious effect of the induction and emission of the explosion venting.Under gas explosion scenarios with different venting positions,the maximum increase of the peak turbulent kinetic energy of the monitoring point at the bend is 20.84％compared with that of gas explosion scenarios without venting,and the maximum increase of the peak turbulent kinetic energy of the monitoring point at the bend is 314％compared with that of monitoring point at the straight pipe.The main influencing factors are the bend structure as well as the induction and emission of the explosion venting.With the increase of the distance between the venting position and the ignition point,the peak turbulent kinetic energy of the monitoring point at the venting position increases first and then decreases,showing a Gaussian function(Gauss Amp).In addition,based on the fitted function,the maximum turbulent kinetic energy is 13 352.55 m2/s2 when the venting position is 4.822 m away from the ignition point.Under a gas explosion scenario with this venting position,the turbulence intensity is strengthened both by the orifice effect and flow restriction of the venting,which causes faster airflow and a higher combustion rate,resulting in larger flowing energy and greater damage to surrounding facilities.
safety engineeringgas explosionturbulent kinetic energyexplosion ventingnumerical simulationpipe with 90° bends
万方数据
维普
