Aiming at the problems of ablation and erode of evacuator after more times firing of mechanized gun, the working process model of evacuator was built based on working principle.

• 摘要针对自行火炮多次射击后抽气装置大多出现烧蚀与腐蚀的情况，在抽气装置工作原理基础上，建立了抽气装置工作过程数值模型；