Rotordynamic Analysis of Textured Annular Seals With Multiphase (Bubbly) Flow
Journal Title: INCAS BULLETIN - Year 2011, Vol 3, Issue 3
Abstract
For some applications it must be considered that the flow in the annular seal contains a mixture of liquid and gas. The multiphase character of the flow is described by the volume fraction of gas (usually air) contained in the liquid under the form of bubbles. The fluid is then a homogenous mixture of air and liquid all thru the annular seal. Its local gas volume fraction depends on the pressure field and is calculated by using a simplified form of the Rayleigh-Plesset equation. The influence of such of a multiphase (bubbly) flow on the dynamic characteristics of a straight annular seal is minimal because the volume of the fluid is reduced. The situation is quite different for textured annular (damper) seals provided with equally spaced deep cavities intended to increase the damping capabilities and to reduce the leakage flow rate. As a by-product, the volume of the fluid in the seal increases drastically and the compressibility effects stemming from the bubbly nature of the flow are largely increased even for a low gas volume fraction. The present work depicts the influence of the gas volume fraction on the dynamic characteristics of a textured annular seal. It is shown that variations of the gas volume fraction between 1% and 0.1% can lead to frequency dependent stiffness, damping and added mass coefficients.
Authors and Affiliations
Mihai ARGHIR, Abdelmalik ZERARKA, Gérard PINEAU
Keywords
Related Articles
- EP ID EP134751
- DOI 10.13111/2066-8201.2011.3.3.1
- Views 96
- Downloads 0
An Object-Oriented Approach to a Scenario-Based System Dynamics Fleet Model
Expanding the current capabilities of a scenario-based system dynamics fleet model is paramount in order to incorporate wider ranging boundary conditions for the assessment of the impact of future aircraft technologies a...
Optimization of flapping-wing micro aircrafts based on the kinematic parameters using genetic algorithm method
In this paper the optimization of kinematics, which has great influence in performance of flapping foil propulsion, is investigated. The purpose of optimization is to design a flapping-wing micro aircraft with appropriat...
Dynamics of shell with destructive heat-protective coating under running load
The problem of dynamic deformation of a plate with a two-layer composite shell with a heat-shattering coating collapsing in time under the action of a running load is solved approximately. The problem is solved in a dyna...
Velocity spectrum and blade’s deformation of horizontal axis wind turbines
The paper presents the velocity distribution calculated by numerical method in axial relative motion of a viscous and incompressible fluid into the impeller of a horizontal axis wind turbine. Simulations are made for dif...
Book Reviews: FLIGHT DYNAMICS IAR 99 Aircraft By Tiberiu HACKER, Achim IONITA, Marius PERHINSKI, Sorin RADNEF, Mihai NEAMTU and Cristian DOROBAT Military Technical Academy Publishing House 2009