Abstract
An experimental investigation of the wake of an Unmanned Aerial Vehicle (UAV) model using flow visualization techniques and a 3D Laser Doppler Anemometry (LDA) system is presented in this work. Emphasis is given on the flow field at the wingtip and the investigation of the tip vortices. A comparison of the velocity field is made with and without winglet devices installed at the wingtips. The experiments are carried out in a closed-circuit subsonic wind tunnel. The flow visualization techniques include smoke-wire and smoke-probe experiments to identify the flow phenomena, whereas for accurately measuring the velocity field point measurements are conducted using the LDA system. Apart from the measured velocities, vorticity and circulation quantities are also calculated and compared for the two cases. The results help to provide a more detailed view of the flow field around the UAV and indicate the winglets’ significant contribution to the deconstruction of wing-tip vortex structures.
Highlights
IntroductionThere is an increasing trend in the development and use of fixed-wing Unmanned
In recent years, there is an increasing trend in the development and use of fixed-wing UnmannedAerial Vehicles (UAVs) by both military forces and civilian organizations [1]
In a comparative with a laser sheet. Their results were used as a first validation in the flow visualizations that were study, Zheng and Ramaprian [27] conducted a detailed study of the vortex of a rectangular wing, employed in this paper
Summary
There is an increasing trend in the development and use of fixed-wing Unmanned. A lot of experimental studies exist that deal with the flow over wings and tip vortices. In a comparative with a laser sheet Their results were used as a first validation in the flow visualizations that were study, Zheng and Ramaprian [27] conducted a detailed study of the vortex of a rectangular wing, employed in this paper. Elsayed et al [28] conducted Particle Image unflapped wing configurations, and compared the velocity fields, vorticity contours, and circulation. Tobalance the bestmeasurements of our knowledge, no and study where was provided regarding the flow development and the effect the winglet has on the tip vortex. The flowfield at the wing tip of the and to quantify the effect the winglets have on the tipcarried vortex
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