基于流固耦合的平流层飞艇超压-体积变化特性研究

Study on Overpressure-volume Variation Characteristics of a Stratospheric Airship Based on Fluid-structure Coupling Method

为了更加准确反映平流层飞艇超压状态下的体积变化,基于LS-DYNA程序,运用流固耦合方法分析某飞艇超压-体积变化特性,研究弹性模量对于超压量、体积变化的影响。结果表明:飞艇内部气体超压将导致飞艇体积增大1%至4%,而飞艇体积的增大将减缓内部超压值增长的速度,超压量与体积变化呈线性关系,囊体弹性模量对飞艇体积变化有较大影响,呈非线性关系。研究结果可为平流层飞艇的结构设计和浮力控制提供一定理论支撑。

In order to reflect the volume change relationship of a stratospheric airship under overpressure state more accurately,the overpressure-volume change characteristics of a stratospheric airship were analyzed by fluid-structure coupling method based on LS-DYNA.The influence of elastic modulus on the overpressure and volume change was studied.The results show that the overpressure inside the airship will lead to the increase of the airship volume by 1%~4%.The relationship between the overpressure and the volume change is linear;The elastic modulus of the capsule has a great influence on the volume change of the airship,showing a nonlinear relationship.The results can provide theoretical support for the structural design and buoyancy control of stratospheric airships.