镁合金带连接分离装置解锁过程与预估模型

摘要

The joining and separating device using magnesium alloy band has simple structure and unlocks reliably, and is widely used in the space launching fields. To study the unlocking process of this device affected by the flow of rocket exhaust, the exhausted flow and heat transfer are simulated by using the numerical method firstly. Secondly, considering the material attributes, the load force and temperature, the factors influencing magnesium alloy band breaking are analyzed. It is shown that the load fore and temperature are the main factors of magnesium alloy band breaking and the device unlocking. Thirdly, the conclusion is certified by some experiments. Furthermore, an estimate model is built to forecast the unlocking time of this device, according to one dimensional gas flow model and one dimensional heat transfer model.%镁合金带连接分离装置因结构简单；解锁可靠而在航天发射领域得到广泛应用.为研究该装置在燃气作用下的解锁过程和解锁时间,首先利用数值计算方法对燃气流动和镁合金带内部传热过程进行数值模拟,获得镁合金带承受的热、力载荷条件；然后结合镁合金材料特性,对镁合金带断裂因素进行深入分析,表明热、力共同作用是镁合金带断裂和连接分离装置解锁的关键因素；最后结合模拟实验,对这一结论进行验证.在此基础上,结合一维气体流动特性和一维热传导模型,建立镁合金带连接分离装置解锁时间的预估模型,为工程设计提供参考.