Abstract
A simplified approach has been applied to analyse the mixing and entrainment processes of the engine exhaust through their interaction with the vortex wake of an aircraft. These investigations are focused on the near filed, extending from exit nozzle to the beginning of the vortex phase (i.e. to about twenty seconds after the wake is generated). This study is performed using an integral model and a numerical simulation for a two-engine large civil aircraft. The properties of the wing-tip vortices on the calculation of the dilution ratio (defined as a tracer concentration) have been shown. The mixing process is also affected by the buoyancy effect, but only after the jet regime, when the trapping in the vortex core has occurred. Qualitative comparison with contrail photography shows similar features. Finally the distortion and stretching of the plume streamlines inside the vortices can be observed, and the role of the descent of the vortices on the maximum tracer concentration has been discussed. (author) 19 refs.
Garnier, F;
Jacquin, L;
Laverdant, A
[1]
- Office National d`Etudes et de Recherches Aerospatiales (ONERA), 92 - Chatillon (France)
Citation Formats
Garnier, F, Jacquin, L, and Laverdant, A.
Engine jet entrainment in the near field of an aircraft.
France: N. p.,
1997.
Web.
Garnier, F, Jacquin, L, & Laverdant, A.
Engine jet entrainment in the near field of an aircraft.
France.
Garnier, F, Jacquin, L, and Laverdant, A.
1997.
"Engine jet entrainment in the near field of an aircraft."
France.
@misc{etde_623666,
title = {Engine jet entrainment in the near field of an aircraft}
author = {Garnier, F, Jacquin, L, and Laverdant, A}
abstractNote = {A simplified approach has been applied to analyse the mixing and entrainment processes of the engine exhaust through their interaction with the vortex wake of an aircraft. These investigations are focused on the near filed, extending from exit nozzle to the beginning of the vortex phase (i.e. to about twenty seconds after the wake is generated). This study is performed using an integral model and a numerical simulation for a two-engine large civil aircraft. The properties of the wing-tip vortices on the calculation of the dilution ratio (defined as a tracer concentration) have been shown. The mixing process is also affected by the buoyancy effect, but only after the jet regime, when the trapping in the vortex core has occurred. Qualitative comparison with contrail photography shows similar features. Finally the distortion and stretching of the plume streamlines inside the vortices can be observed, and the role of the descent of the vortices on the maximum tracer concentration has been discussed. (author) 19 refs.}
place = {France}
year = {1997}
month = {Dec}
}
title = {Engine jet entrainment in the near field of an aircraft}
author = {Garnier, F, Jacquin, L, and Laverdant, A}
abstractNote = {A simplified approach has been applied to analyse the mixing and entrainment processes of the engine exhaust through their interaction with the vortex wake of an aircraft. These investigations are focused on the near filed, extending from exit nozzle to the beginning of the vortex phase (i.e. to about twenty seconds after the wake is generated). This study is performed using an integral model and a numerical simulation for a two-engine large civil aircraft. The properties of the wing-tip vortices on the calculation of the dilution ratio (defined as a tracer concentration) have been shown. The mixing process is also affected by the buoyancy effect, but only after the jet regime, when the trapping in the vortex core has occurred. Qualitative comparison with contrail photography shows similar features. Finally the distortion and stretching of the plume streamlines inside the vortices can be observed, and the role of the descent of the vortices on the maximum tracer concentration has been discussed. (author) 19 refs.}
place = {France}
year = {1997}
month = {Dec}
}