Annular-flow-induced vibrations of an axially variable body of revolution in a duct of variable cross-section
Abstract
An analytical investigation is presented of the unsteady flow in an axially variable, narrow annular passage and of the fluid-dynamic forces exerted on the center-body, which is a flexibly mounted rigid body of revolution, with variable cross section also. Based on this theory, a first-approximation solution is presented, followed by a more accurate solution, for the case of unsteady ideal flow. A separate analytical model and corresponding solution method are developed for the case of unsteady viscous flow, to take into account real fluid effects. 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 the variants of the theory mentioned. The influence of various system parameters on stability is also discussed.
- Publication:
-
IN: Symposium on Flow-Induced Vibrations
- Pub Date:
- 1984
- Bibcode:
- 1984fiv.....4...53M
- Keywords:
-
- Annular Flow;
- Ducted Flow;
- Fluid-Solid Interactions;
- Structural Vibration;
- Variable Geometry Structures;
- Aerodynamic Coefficients;
- Approximation;
- Damping;
- Equations Of Motion;
- Flow Stability;
- Linearization;
- Stiffness;
- Viscosity;
- Fluid Mechanics and Heat Transfer