Experimental study on gas explosion pressure and flame wave propagation in different pipe diameters
To effectively control the explosion accidents in low-concentration gas transmission pipelines,experimental research was conducted using steel explosion test pipelines with nominal diameters of 700 mm,500 mm,and 200 mm.The study investigated the propagation characteristics of gas explosion pressure and flame front in the pipelines.The results showed that the maximum explosion pressure during the propagation process exhibited a fluctuating upward trend with changes in the length-to-diameter ratio.The variation in pipe diameter only affected the temporal and spatial position of the pressure peak.The maximum explosion pressures for the 700 mm,500 mm,and 200 mm pipelines occurred at length-to-diameter ratios of 115,103,and 103,corresponding to 0.59 MPa,0.28 MPa,and 0.09 MPa,respectively.Larger pipe diameters resulted in higher maximum explosion pressures.The flame propagation velocity exhibited a fluctuating trend with changes in the length-to-diameter ratio,overall showing an increasing trend.The flame propagation process could be divided into three stages:free propagation,rebound acceleration,and stable acceleration.The maximum flame propagation velocities for the 700 mm,500 mm,and 200 mm pipelines occurred at length-to-diameter ratios of 83,108,and 96,corresponding to 846 m/s,943 m/s,and 250 m/s,respectively.During the experiments,deflagration-to-detonation transition phenomena occurred in the 700 mm and 500 mm pipelines,with flame speeds exceeding 800 m/s.Larger pipe diameters led to earlier deflagration-to-detonation transition processes.The research findings provide strong support for the safety protection of gas pipeline transportation and utilization in engineering practice.
gas explosiondifferent pipe diametersexplosion pressureflame propagation speed
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