Induced drag reduction with wing tip mounted propellers

Loth, John L.; Loth, F.

doi:10.2514/6.1984-2149

Cited by 23 publications

(11 citation statements)

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“…Wingtip-mounted propellers have been envisaged for their favorable interaction effects. For the tractor propeller variant, the interaction of the wing with the slipstream results in a reduction of the wing induced drag if the rotation direction of the propeller is opposite to that of the wingtip vortex [1,2]. The pusher propeller variant experiences a reduction in shaft power due to the swirling vortex inflow from the wingtip in case the propeller rotates against the direction of the wingtip vortex [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Validation and Comparison of RANS Propeller Modeling Methods for Tip-Mounted Applications

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Validation and Comparison of RANS Propeller Modeling Methods for Tip-Mounted Applications

et al. 2019

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“…Previous research efforts thereby focused on wingtip propellers. In 1984, Loth et al investigated wingtip propellers and indicated the potential of drag reduction particularly due to the use of propellers with high disk loadings [2]. While their numerical approach was later disagreed by Miranda et al [3], their experimental results demonstrated drag reduction potential.…”

Section: Introductionmentioning

confidence: 99%

Towards higher aerodynamic efficiency of propeller-driven aircraft with distributed propulsion

Keller

2021

CEAS Aeronaut J

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The scope of the present paper is to assess the potential of distributed propulsion for a regional aircraft regarding aero-propulsive efficiency. Several sensitivities such as the effect of wingtip propellers, thrust distribution, and shape modifications are investigated based on a configuration with 12 propulsors. Furthermore, an initial assessment of the high-lift performance is undertaken in order to estimate potential wing sizing effects. The performance of the main wing and the propellers are thereby equally considered with the required power being the overall performance indicator. The results indicate that distributed propulsion is not necessarily beneficial regarding the aero-propulsive efficiency in cruise flight. However, the use of wing tip propellers, optimization of the thrust distribution, and wing resizing effects lead to a reduction in required propulsive power by $$-2.9$$ - 2.9 to $$-3.3\,\%$$ - 3.3 % compared to a configuration with two propulsors. Adapting the leading edge to the local flow conditions did not show any substantial improvement in cruise configuration to date.

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“…Wingtip-mounted propellers have been envisaged for their favorable interaction effects. For the tractor propeller variant, the interaction of the wing with the slipstream results in a reduction of the wing induced drag if the rotation direction of the propeller is opposite to that of the wingtip vortex [1][2][3]. The pusher propeller variant experiences a reduction in shaft power due to the swirling vortex inflow from the wingtip in case the propeller rotates against the direction of the wingtip vortex [2,[4][5][6].…”

Section: Introductionmentioning

confidence: 99%