密闭空间内氢化铝爆炸特性研究OA

To investigate the explosion characteristics and mechanism of AlH3 dust in a confined space,the explosion experi-ments are carried out on a cylindrical explosion test platform under different concentrations and ignition delay times.Key pa-rameters including optimum explosion concentration,optimum ignition delay time,explosion pressure,and flame propagation characteristics of AlH3 dust are obtained.Finally,the explosion mechanism of AlH3 dust is summarized.The results show that when the ignition delay time is 60 ms,the optimum explosion concentration of AlH3 dust is 750 g/m3.Correspondingly,the op-timal ignition delay time for this concentration is found to be 100ms.Under an ignition delay time of 100ms,both the maxi-mum explosion pressure and pressure rise rate exhibits a trend of initial increase followed by decrease with increasing AlH3 con-centration,peaking at 750 g/m3 at 1.25 MPa and 206.98 MPa/s,respectively.The time corresponding to the peak flame area first decreases and then increases,whereas the flame burning duration varies inversely with the peak time,both reaching ex-treme values at 750 g/m3.Mechanism research indicates that the AlH3 explosion flame undergoes four stages:ignition induc-tion,flame growth,intense reaction,and attenuation and extinction.With the increase in dust concentration,the time re-quired for the flame to fill the entire vessel decreases first and then increases,while the flame duration increases first and then decreases.Both parameters reached the extreme values at a concentration of 750g/m3,corresponding to 1.90 and 44.70ms,respectively.