弹性变形对细长旋成体压心影响研究  

Effects of elastic deformation on the center of pressure of a slender body

作　　者：窦怡彬[1] 史晓鸣[1] 李海东[1] 

机构地区：[1]上海航天技术研究院第八设计部,上海201109

出　　处：《应用力学学报》2015年第5期852-857,901,共6页Chinese Journal of Applied Mechanics

摘　　要：采用CFD/CSD耦合方法计算了纵向平面内细长旋成体的静气动弹性问题,研究了不同攻角下弹性变形对细长旋成体压心位置的影响规律。流场计算采用可压缩N-S方程求解,湍流模型采用可实现k-ε模型;采用自动支撑惯性释放方法计算了无约束细长旋成体的静气动弹性变形。算例结果表明:1随着攻角增大,静气动弹性变形呈现从一阶弯曲为主到一阶、二阶弯曲共存形式;2无论是刚体模型还是考虑静气动弹性变形的弹性体模型,其压心位置都随攻角增大而后移;3相同来流攻角下,静气动弹性变形使细长旋成体头部攻角增大,导致压心位置相对刚体模型靠前;4随着攻角增大,细长旋成体圆柱段上压力分布逐渐增加,弹性变形引起的头部压力增加对整体压心位置的影响逐渐减小,因此压心位置前移量逐渐减小。对于本文计算模型,弹性变形引起的压心位置改变量不超过弹身长度的1.55%。In this paper, the longitudinal static aeroelasticity of slender body is simulated with CFD/CSD coupling method, and the effects of deformation on the movement of the center of pressure(Cp) are analyzed under a series of angles of attack. The flow field of slender body is simulated by solving compressible Navier-Stokes equation, and a realized k-ε turbulent model is used. The static aeroelastic deformation of this unconstrained slender body is solved by auto support inertia relief method. The results indicate that: 1) the static aeroelastic deformation presents different form from first order bending to both first and second order bending with the increasing of angle of attack. 2) In either rigid or static aeroelastic model, the Cp moves backward as the angle of attack increasing. 3) In static aeroelastic model, as a result of the deformation, the local angle of attack in the forebody increases and the Cp locates front of its counterpart in a rigid model. 4) However the pressure increased in the forebody due to the deformation is of less effect on the Cp location as the pressure increased on the cylinder of the slender body with the increasing of angle of attack, and the movement of the Cp decreases accordingly. In this paper, the Cp moves no more than 1.55% of the length of slender body owing to the deformation.

关 键 词：CFD/CSD耦合 细长旋成体 静气动弹性 压心 惯性释放 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]