固体发动机点火燃气流动与药柱变形耦合过程数值模拟(英文)

采用MpCC I耦合器作为FLUENT和ANSYS的数据交换平台,对带径向翼槽大长径比固体发动机点火过程中的流固耦合现象进行了数值模拟。结果表明,该型发动机点火瞬间燃气流动与药柱变形强烈耦合,药柱变形主要发生在径向翼槽台阶的尖点处,且随点火过程的推进变形加剧;中间翼槽尖点处药柱的变形量比头部翼槽处大,是造成发动机点火故障的主要原因。计算获得了点火压力冲击下药柱的位移及应力场的分布规律,文中的研究结果可为流固耦合技术在固体发动机上的应用奠定一定的基础。

Coupled numerical simulation for solid rocket motor ignition gas flow and propellant deformation

By using MpCCI coupler as the data exchange platform of FLUENT and ANSYS analysis software, the Fluid Structure Interaction (FSI) phenomenon during ignition process of large L/D ratio SRM with radial fin slot is simulated. The results show that ignition gas flow couples with grain deformation strongly at ignition transient of this type SRM, grain deformation occurs mainly at the cusp of radial fin slot step, which is aggravated along with ignition process. Grain deformation at the tip of middle fin slot is larger than the one of head fin slot, which results in ignition failure. The distribution of grain displacement and stress field is calculated under the impact of ignition pressure, and the research results can make certain groundwork for applying FSI technology to SRM.