The gasdynamic and electromagnetic factors affecting the position of arc roots in a tubular arc heater are analyzed.Magnitudes of the various factors are estimated through numerical modelling,and the overall action on...The gasdynamic and electromagnetic factors affecting the position of arc roots in a tubular arc heater are analyzed.Magnitudes of the various factors are estimated through numerical modelling,and the overall action on the arc assessed.It is found that the actions on the arc in the rear electrode can be balanced in a stable manner and the arc root can be stabilized at a certain axial position.In the front electrode,the various factors cannot be balanced,and the are root can only stay within the electrode through the mechanism of recurrent shunting.These conclusions agree with experimental observations.展开更多
Pure nitrogen gas was heated with direct current arc, at input powers from several hundred Watt to over 5 kW, and then injected through a nozzle into a chamber at 1 or 10 Pa pressure, with the purpose of accelerating ...Pure nitrogen gas was heated with direct current arc, at input powers from several hundred Watt to over 5 kW, and then injected through a nozzle into a chamber at 1 or 10 Pa pressure, with the purpose of accelerating the gas to very high speed around 7 km/s. Various structures of the arc generator and gas expansion nozzle were examined. Results show that bypass exhausting of the boundary layer before it enters the nozzle divergent section can greatly increase flow speed of the jet, thus it might be possible to use nitrogen as a working gas in high speed gas dynamic test facilities.展开更多
基金The project supported by National Natural Science Foundation of China
文摘The gasdynamic and electromagnetic factors affecting the position of arc roots in a tubular arc heater are analyzed.Magnitudes of the various factors are estimated through numerical modelling,and the overall action on the arc assessed.It is found that the actions on the arc in the rear electrode can be balanced in a stable manner and the arc root can be stabilized at a certain axial position.In the front electrode,the various factors cannot be balanced,and the are root can only stay within the electrode through the mechanism of recurrent shunting.These conclusions agree with experimental observations.
基金supported by the National Natural Science Foundation of China(Nos.11575273 and 11475239)
文摘Pure nitrogen gas was heated with direct current arc, at input powers from several hundred Watt to over 5 kW, and then injected through a nozzle into a chamber at 1 or 10 Pa pressure, with the purpose of accelerating the gas to very high speed around 7 km/s. Various structures of the arc generator and gas expansion nozzle were examined. Results show that bypass exhausting of the boundary layer before it enters the nozzle divergent section can greatly increase flow speed of the jet, thus it might be possible to use nitrogen as a working gas in high speed gas dynamic test facilities.
