Study on discharge characteristics of low-temperature sub-atmospheric pressure under steep change rate voltage

Aiming at the gas discharge problem under the working environment of electric aircraft, this paper studies the gas discharge characteristics at low-temperature sub-atmospheric pressure. In the aspect of experiment, a gas discharge shooting platform was built, and the discharge process was photographed by ICCD. In the aspect of simulation, a two-dimensional axisymmetric model of needle-plate electrode gas discharge is established, and three sets of Helmholtz equations are used to solve the photoionization. The results show that under the same voltage, the electric field intensity in the discharge process increases first, then decreases and finally increases again. The discharge speed increases with the increase of altitude, and the electron density in the streamer decreases with the increase of altitude. The development speed of streamer in the middle stage is higher than that in the early stage, and the speed increases more obviously with the increase of altitude. The development speed of streamer in the later stage is lower than that in the middle stage, but with the increase of altitude, the development speed of streamer in the later stage is higher than that in the middle stage.