Ground Vortex Formation with Twin Impinging Jets

962257

11/18/1996

Event
SAE International Powered Lift Conference and Exposition
Authors Abstract
Content
Laser Doppler measurements and flow visualization are presented for a three-dimensional fountain flow generated by the impingement of two-axisymmetric turbulent jets on a ground plane through the influence of a low-velocity crossflow. The experiments were performed for a Reynolds number based on the jet-exit conditions of 1.05x105, a free stream to jet velocity ratio, of 0.033, and a jet height to jet diameter ratio, H/D, of 5, and include mean and turbulent velocity characteristics along the two normal directions contained in planes parallel to the nozzle axis. The results, which have relevance to flows encountered by powered-lift aircraft operating in ground effect, show the presence of a complex 3-D scarf vortex formed around the impinging jets. In zones were measurement data are not available, the flow details are numerically visualized using a solution of the finite difference form of the three-dimensional Reynolds-averaged Navier-Stokes equations, incorporating the turbulence viscosity concept.
Meta TagsDetails
DOI
https://doi.org/10.4271/962257
Pages
10
Citation
Barata, J., "Ground Vortex Formation with Twin Impinging Jets," SAE Technical Paper 962257, 1996, https://doi.org/10.4271/962257.
Additional Details
Publisher
Published
Nov 18, 1996
Product Code
962257
Content Type
Technical Paper
Language
English