Jielong "Jacky" Cai
Download Project (2.3 MB)
We extend our recent propeller ground-effect study to consider a circular ground-plate, instead of planar-surface of assumed infinite extent. Parameter studies include propeller to plate diameter ratio, propeller diameter to ground-offset ratio, and propeller pitch to diameter ratio. As with classical ground effect, benefits of thrust-augmentation and/or power-reduction with proximity to the ground, depend on the propeller pitch to diameter ratio. Flow visualization suggests that for larger pitch to diameter ratio, the lack of conclusively large ground-effect benefits can be attributed to stalled flow about the blade, and spatially more diffuse tip-vortices. A circular ground-plate of half of the propeller diameter was found to have almost no distinction from that of an unimpeded free-stream, while when the plate and propeller have the same diameter, the resulting ground-effect already resembles that of the infinite-plate.
Primary Advisor's Department
Mechanical and Aerospace Engineering
Stander Symposium project, School of Engineering
"Propeller Partial Ground Effect" (2020). Stander Symposium Projects. 1857.