通过研究对接式和搭接式焊缝试板电子束流与焊缝熔深之间的关系、焊接顺序与角变形高度之间的关系,得出了表面张力贮箱前(后)舱推进剂管理装置上(下)组件电子束焊接工艺规范,即加速电压为60 k V,焊接速度为500 mm/min,工作距离为300 mm...通过研究对接式和搭接式焊缝试板电子束流与焊缝熔深之间的关系、焊接顺序与角变形高度之间的关系,得出了表面张力贮箱前(后)舱推进剂管理装置上(下)组件电子束焊接工艺规范,即加速电压为60 k V,焊接速度为500 mm/min,工作距离为300 mm,电子束流为6 m A,聚焦电流为2.11 A,电子束偏移量为0.1 mm的焊接工艺规范。采用该工艺规范焊接的表面张力贮箱前(后)舱推进剂管理装置上(下)组件焊后和振动试验后的泡破点实测值满足设计要求。该表面张力贮箱已用于某型号上面级液体发动机。该发动机已通过了地面热试车考核。展开更多
Abstract This paper focuses on the stability of capillary forced flow. In space, open capillary channels are widely used as the liquid and gas separation devices to manage liquid positioning and transportation. Surfac...Abstract This paper focuses on the stability of capillary forced flow. In space, open capillary channels are widely used as the liquid and gas separation devices to manage liquid positioning and transportation. Surface collapse happens when the flow rate exceeds the critical value, leading to a failure of propellant management. Knowledge of flow rate limitation is of great significance in design and optimization of propellant management devices （PMDs）. However, the capillary flow rate limitation in an asymmetry channel has not been studied yet in the literature. In this paper, by introducing an equivalent angle to convert the asymmetry corner to a symmetry one, the one-dimensional theoretical model is developed. The flow rate limitation can then be investigated as a function of the channel geometry as well as liquid property based on the model. Comparisons between the asymmetry and symmetry channels bring forth the characteristics of the two kinds of channels, and demonstrate good accordance between the new advanced model and the existing one in the literature. This theoretical model can provide valuable reference for PMD designers.展开更多
文摘通过研究对接式和搭接式焊缝试板电子束流与焊缝熔深之间的关系、焊接顺序与角变形高度之间的关系,得出了表面张力贮箱前(后)舱推进剂管理装置上(下)组件电子束焊接工艺规范,即加速电压为60 k V,焊接速度为500 mm/min,工作距离为300 mm,电子束流为6 m A,聚焦电流为2.11 A,电子束偏移量为0.1 mm的焊接工艺规范。采用该工艺规范焊接的表面张力贮箱前(后)舱推进剂管理装置上(下)组件焊后和振动试验后的泡破点实测值满足设计要求。该表面张力贮箱已用于某型号上面级液体发动机。该发动机已通过了地面热试车考核。
基金supported by the National Natural Science Foundation of China(Nos.50975280 and 61004094)
文摘Abstract This paper focuses on the stability of capillary forced flow. In space, open capillary channels are widely used as the liquid and gas separation devices to manage liquid positioning and transportation. Surface collapse happens when the flow rate exceeds the critical value, leading to a failure of propellant management. Knowledge of flow rate limitation is of great significance in design and optimization of propellant management devices （PMDs）. However, the capillary flow rate limitation in an asymmetry channel has not been studied yet in the literature. In this paper, by introducing an equivalent angle to convert the asymmetry corner to a symmetry one, the one-dimensional theoretical model is developed. The flow rate limitation can then be investigated as a function of the channel geometry as well as liquid property based on the model. Comparisons between the asymmetry and symmetry channels bring forth the characteristics of the two kinds of channels, and demonstrate good accordance between the new advanced model and the existing one in the literature. This theoretical model can provide valuable reference for PMD designers.
