点火方式对欠膨胀氢气射流爆炸超压影响规律研究

An experimental study was carried out on the variation of overpressure of underexpanded hydrogen jet ignition by spontaneous ignition and electric spark ignition. We measured the explosion overpressure and flame propagation rate of spontaneous ignition and electric spark ignition under different release pressures, we also analyzed the influence mechanism of initial pressure and ignition conditions on explosion overpressure. The experimental results show that under the same release conditions, the overpressure peak of spontaneous ignition is higher, the pressure rise rate is faster, and the development process of spontaneous ignition is more stable. With the release pressure of the buffer tank increasing from 6 MPa to 9 MPa, the explosion overpressure peak outside the spontaneous ignition tube first increases and then decreases. When the release pressure is 8 MPa, the explosion overpressure caused by spontaneous ignition reaches the maximum value of 15.97 kPa, while the explosion overpressure at the ignition source of electric spark decreases from 7.23 kPa to 3.17 kPa and then increases to 4.19 kPa with the increase of the release pressure. The spark ignition flame forms an irregularly shaped ignition core at the ignition source, and the flame propagation velocity is greater than the spontaneous combustion flame development velocity. This study has reference significance for the design of hydrogenation station and the risk assessment of ignition and explosion.