Global ETD Search
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Showing 1 to 5 of 5 for “"Trefftz plane"”.
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A simplified vortex sheet roll-up method for formation flight
… roll-up of the leading wake is computed in the Trefftz plane using a linear vorticity panel method. A smoothing parameter as well as a truncation of the vortex sheet in the highly rolled-up areas are introduced in order to stabilize the computations. The trailing wing is simply modeled as a …
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Hybrid wing-body aircraft noise and performance assessment
… inlet duct and is extended far downstream for a Trefftz plane power balance analysis to determine the propulsive power required for steady level flight. A fan actuator volume is included to couple the airframe external and the engine internal flows. Aircraft power savings, fan efficiency, and …
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Optimum Spanloads Incorporating Wing Structural Considerations And Formation Flying
… produce wing weight savings that result in airplane performance benefits. For a group of aircraft flying in formation, non-elliptic lift distributions can give high induced drag reductions both for the formation and for each airplane. For single aircraft, a discrete vortex method which performs …
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Experimental Determination of Lift and Lift Distributions for Wings In Formation Flight
… distributions obtained along a near-field plane were processed to calculate wingtip vortex strengths. Additionally, vortex position instabilities and the shedding of vorticity inboard of the wingtips were observed. To determine the circulation distributions for the trailing wing, the …
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Rotor Wakes; Formations, Interactions, and Design
… data of the three velocity components in the Trefftz-plane allows for the characterization of the interactions seen between the rotor wake and the lifting wake. It was found that when the rotor wake spins in the same orientation as the wing-tip roll-up, the induced drag of the blown wing is …