冲击作用下推进剂变形的流固耦合分析方法

固体火箭发动机的点火过程是一个复杂多变的理化过程,具有时间短、升温、升压梯度大等特点。针对固体火箭发动机点火过程中的装药结构完整性问题,文中建立了一套用于分析冲击作用下固体推进剂变形现象的仿真模型。采用RANS和ALE方法,分别对流体域和固体域进行求解,以两场独立交叉耦合迭代的模式实现了仿真过程。以一个推进剂冷流冲击实验作为算例,对仿真模型进行了验证,计算值与测量值间误差不超过10%,仿真模型计算可靠,具有向固体火箭发动机实际点火过程拓展的价值。

A solid-fluid interaction model for propellant deformation under impact condition

The ignition of SRM is a complicated and changeful physicochemical process,which has the features of extremely short duration and particularly high temperature & pressure gradient.An applicable solid-fluid interaction simulation model was established to analyze the phenomenon of propellant deformation under impact effect for the purpose of dealing with grain structure integrity problem during SRM ignition transient.RANS and ALE method were used independently in fluid and solid sub-domain.The interaction between two sub-domains was accomplished by the transmission of interface forces.The model was validated with a cold flow test.The results of simulation agree well with test data.It shows that the model has a relatively high accuracy and could be used to investigate the ignition process in a practical SRM.