延时起爆装置可靠点火技术的研究OA北大核心

Delay detonation device is an engineering application of deflagration to detonation transition(DDT).The technical characteristics of the delay detonation device of a certain type of submunition are:the detonating cord completes the detonation and transmits the detonation signal to the ignition chamber of the device.The ignition chamber opens the fire transmission channel under the action of external force,and completes the delay function through the combus-tion of the ignition powder.At the same time,the energy of the ignition powder is transmitted to the explosive through the fire transmission channel,and the explosive achieves the process of DDT under the constraint of the tube shell,outputting stable detonation.In the process of product development,phenomena such as boron/potassium nitrate ignition powder not igniting blunt black-5 explosive and unreliable detonation output occurred.In order to achieve reliable ignition and stable detonation output,based on the characteristics of DDT,the ignition charge structure of boron/potassium nitrate was rede-signed by setting a central hole on the output end face of the ignition charge.When the combustion front of the ignition charge reaches the small hole,the energy generated by combustion can be continuously transferred to the explosive through the open fire transmission channel,reducing the energy escape at the initial stage to increase the initial energy of the explo-sive.This enables the explosive to transition to unstable combustion and achieve weak detonation under the bondage of the metal tube shell.And then,the growth and output of stable detonation are achieved.Through the redesign of the boron/potassium nitrate ignition charge,the action reliability of the delay initiation device of a certain type of submunition has been improved.