Abstract
Currently, a new generation of ducted fan UAVs
(Unmanned Aerial Vehicles) is under development for a wide
range of inspection, investigation and combat missions as well
as for a variety of civil roles like traffic monitoring,
meteorological studies, hazard mitigation etc. The current
study presents extensive results obtained experimentally in
order to investigate the tip clearance effects on aerodynamic
characteristics of a ducted fan for small UAV systems. Three
ducted fans having different tip clearance gap and with same
rotor size were examined under three different yawed
conditions of calibrated slanted hot-wire probe. Threedimensional velocity flow fields were measured from hub to tip
at inlet and outlet of the ducted fan. The analysis of data
acquired by the calibrated slanted hot-wire anemometer were
done by PLEAT (Phase locked Ensemble Averaging Technique)
and three non-linear differential equations were solved
simultaneously by using Newton–Raphson numerical method.
Flow field characteristics such as tip vortex and secondary flow
were confirmed through axial, radial and tangential velocity
contour plot. At the same time, the effects of tip clearance on
axial thrust were also investigated by using wind tunnel
measurement system. For enhancing the performance of ducted
fan, tip clearance level should be best optimized.
Iliyas Raza , Jinsoo Cho. (2020) Tip Clearance Effects on the Performance of Ducted Fan, Journal of Space Technology , Volume 10, Issue 1.
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