Flow Structures of Wishbone Vortex Generators and Their Interactions with a Backward-Facing Ramp

Cheawchan, A.; Mohamed, M.A.; Ng, Bing Feng; New, T. H.

doi:10.1061/jaeeez.aseng-4537

Cited by 4 publications

(1 citation statement)

References 31 publications

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“…Experimental uncertainty analysis based on the 3σ statistical approach shows that the maximum uncertainty levels for the force and moment coefficients were approximately 0.0313 and 0.0464, respectively. Note that this wind tunnel has been used satisfactorily in earlier experimental studies by [12,18,19].…”

Section: Wind Tunnel Facility and Force Measurementsmentioning

confidence: 96%

Flow Structures and Aerodynamic Behavior of a Small-Scale Joined-Wing Aerial Vehicle under Subsonic Conditions

New

Teo

et al. 2023

Aerospace

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Flow behavior and aerodynamic performance of a small-scale joined-wing unmanned aerial vehicle (UAV) was studied experimentally and numerically under various pitch and yaw angle combinations in subsonic flow conditions. Selected numerical results are compared against experimental results obtained using surface oil flow visualizations and force measurements, with additional simulations expanding the range of combined pitch and yaw configurations. Under zero-yaw conditions, increasing the pitch angle leads to the formation of symmetric ogive vortex roll-ups close to the fuselage and their significant interactions with the fore-wing. Additionally, contributions to lift and drag coefficients under zero-yaw conditions by the key UAV components have been documented in detail. In contrast, when the UAV is subjected to combined pitch and yaw, no clear evidence of such ogive vortex roll-ups can be observed. Instead, asymmetric flow separations occur over the fuselage’s port side and resemble bluff-body flow behavior. Additionally, these flow separations become more complex, and they interact more with the fuselage and fore- and aft-wings when the yaw angle increases. Lift and drag variations due to different pitch and yaw angle combinations are also documented. Finally, rolling and yawing moment results suggest that the present UAV possesses adequate flight stability unless the pitch and yaw angles are high.

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Section: Wind Tunnel Facility and Force Measurementsmentioning

confidence: 96%