The Unsteady Potential Flow in an Axially Variable Annulus and Its Effect on the Dynamics of the Oscillating Rigid Center-Body
The Unsteady Potential Flow in an Axially Variable Annulus and Its Effect on the Dynamics of the Oscillating Rigid Center-Body
复制标题
轴向变环内的非定常势流及其对振动刚性中心体动力学的影响
DOI：
10.1115/1.3242503
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
M. Païdoussis
中科院分区：
文献类型：
--
作者：
D. Mateescu;M. Païdoussis
本文分析了由静止的刚性管道和摆动的刚性中心体组成的轴向变截面环形窄通道内的非定常势流，以确定作用在中心体上的流体动力。在此基础上，导出了不可压缩流体非定常流动的一级近似解和更精确的解。中心体的稳定性进行了研究，在空气动力（或流体动力）系数的阻尼，刚度和惯性（虚拟质量），由这个理论确定。讨论了各种系统参数对稳定性的影响。
This paper presents an analytical investigation of the unsteady potential flow in a narrow annular passage formed by a motionless rigid duct and an oscillating rigid center-body, both of axially variable cross section, in order to determine the fluid-dynamic forces exerted on the center-body. Based on this theory, a first-approximation solution as well as a more accurate solution are derived for the unsteady incompressible fluid flow. The stability of the center-body is investigated, in terms of the aerodynamic (or hydrodynamic) coefficients of damping, stiffness and inertia (virtual mass), as determined by this theory. The influence of various system parameters on stability is discussed.