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 97
- Downloads 0
Neuro-fuzzy control synthesis for hydrostatic type servoactuators. Experimental results
Continuing recent works of the authors, the paper shows the developing and the application of a neuro-fuzzy control law to the positioning outer loop of a hydrostatic type servoactuator. Experimental results are presente...
Experimental results and numerical simulations for transonic flow over the ONERA M4R model
This paper presents a comparison between experimental results of transonic flow over the ONERA M4R calibration model obtained in the INCAS Trisonic wind tunnel and the numerical results. The first purpose, emphasized in...
The Origin of Shear Turbulence
Previously, the turbulent flows were studied as they have been disregarding their origin, and without looking into some of the details of the mechanism of turbulence production and sustainment. This approach focusing its...
New Methodology for Optimal Flight Control Using Differential Evolution Algorithms Applied on the Cessna Citation X Business Aircraft – Part 1. Design and Optimization
Setting the appropriate controllers for aircraft stability and control augmentation systems are complicated and time consuming tasks. As in the Linear Quadratic Regulator method gains are found by selecting the appropria...
Flight Software Development and Validation Workflow Management System
The aerospace industry is undergoing unprecedented transformation. New players, new ventures, and new technologies drive the established business towards a transition from traditional models and strategies to automated p...