Investigation of the Ion-Probe Technology for Measuring the DDT Distance

In order to obtain the Deflagration to Detonation Transition (DDT) distance in the detonative tube,an ion probe system based on comparative electric circuit was made.This system was used to measure the flame propagation velocities along the tube,and furthermore to determine the DDT distance.As compared with high frequency pressure transducers,this system was simpler and cheaper,especially it could be used in the high temperature condition for a longer time.In this paper,the DDT distances of acetylene and oxygen mixture were measured with this system,and the results were consistent with that of high frequency pressure transducers.