微贮箱移动电子束焊接传热数值分析

Numerical analysis of heat transfer of moving EBW in micro propellant tank

建立了某姿轨控发动机推进剂贮箱移动电子束焊接热源的焊接温度场数值仿真模型,采用锥体热源描述电子束焊接热源,通过等价比热容法来处理熔化潜热,得到电子束焊接过程中贮箱温度、焊接熔池形状和尺寸随时间的变化状况.结果表明:仿真计算所得贮箱温度与实测数据的差异小于10%.在焊接过程中,利用安装在贮箱外表面的纯铜散热盘可以将贮箱半膜处的温度从503K降低至364K以下,避免了焊接过程中贮箱温度过高出现结构损伤.该计算方法与结构散热方式可为其他产品的焊接提供借鉴与参考.

Numerical model of analyzing temperature field for propellant tank with moving resource electron-beam welding（EBW）was set up,with which the heat source of EBW was described by cone source and the latent heat of melting was determined by means of equivalent specific heat.Time evolutions of temperature distribution on tank,molten pool shape and size were obtained.Results showed that,the error ratio of temperature between calculation and measurement was less than 10%.During the later welding process,the pure cupper radiator plate installed on the outer surface of the tank could be used to reduce the temperature of the diaphragm of propellant tank from 503 Kto lower than 364 K,avoiding the structure damage due to high temperature.The calculation method and heat radiation figuration can also be adopted to other productswelding process.