Mathematical modeling of subsonic two-phase condensation flow around an aircraft under various flight conditions

Karabelas, Stavros J. and Markatos, Nikolaos C. (2007) Mathematical modeling of subsonic two-phase condensation flow around an aircraft under various flight conditions. JOURNAL OF COMPUTATIONAL AND APPLIED MECHANICS, 8 (1). pp. 101-116. ISSN 1586-2070

Preview

Text 8-1-KarabelasMiKTeX2007V8N1.pdf - Published Version Download (430kB) | Preview

Abstract

The present study investigates the process of condensation of water vapour to water liquid substance in highly convective flow conditions. An aircraft (model) geometry was chosen to simulate the condensation effects, since this application is of real interest worldwide. The flow is considered turbulent, subsonic and compressible at high Reynolds number. The contribution of turbulence effects is accounted for by the Spalart-Allmaras model, which appears suitable for such type applications. The study of condensation is based on a mixture two- phase model, which allows the substances to be interpenetrating, while following the economical single-fluid approach. Furthermore, both phases may move at different velocities (slip velocity) in a manner that is described by conservation equations. Results are presented for several flight conditions, concerning the flow Mach number and the ambient air humidity levels. Since the condensation effects are investigated on an aircraft configuration, emphasis has been given to the liquid mass-fraction distribution in several critical areas, where considerable formation of liquid droplets is observed. Results show that for humidity levels higher than 0.8, high liquid concentration areas are indicated onto the rear part of the wings near their roots. For lower relative humidity values, those areas are situated at the rear part of the cockpit. Attention is focused on the dispersion of the condensation cloud. Results are presented, by means of grayscale figures and numerical diagrams, and appear plausible.

Actions (login required)

Edit Item