Prediction of Aerodynamic Drag.

Jobe, Charles E.

doi:10.21236/ada326842

Cited by 19 publications

(14 citation statements)

References 1 publication

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“…One way to help achieve this goal is by using improved and innovative technologies targeting drag reduction, specifically, lift-induced drag reduction. The drag breakdown of a typical transport aircraft shows that the lift-induced drag can amount to as much as 40% of the total drag at cruise conditions and 80-90% of the total drag during take-off and climb conditions [1][2][3][4][5][6][7][8][9]. Reducing lift-induced drag is therefore of paramount importance to improve aircraft efficiency.…”

Section: Aoamentioning

confidence: 99%

Variable cant angle winglets for improvement of aircraft flight performance

2020

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Traditional winglets are designed as fixed devices attached at the tips of the wings. The primary purpose of the winglets is to reduce the lift-induced drag, therefore improving aircraft performance and fuel efficiency. However, because winglets are fixed surfaces, they cannot be used to control lift-induced drag reductions or to obtain the largest lift-induced drag reductions at different flight conditions (take-off, climb, cruise, loitering, descent, approach, landing, and so on). In this work, we propose the use of variable cant angle winglets which could potentially allow aircraft to get the best all-around performance (in terms of lift-induced drag reduction), at different flight phases. By using computational fluid dynamics, we study the influence of the winglet cant angle and sweep angle on the performance of a benchmark wing at Mach numbers of 0.3 and 0.8395. The results obtained demonstrate that by adjusting the cant angle, the aerodynamic performance can be improved at different flight conditions.

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Section: Aoamentioning

confidence: 99%

Variable cant angle winglets for improvement of aircraft flight performance

2020

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“…Typical missions flown by large transonic aircraft include a lower stratospheric cruise segment lasting an average of 90% of the block time, in which induced drag accounts for about 25% of total drag [16]. There is a limited number of studies on wing-tip implementation or research for relatively smaller turboprop aircraft, and especially regional commuters.…”

Section: Winglet Studies On Various Aircraft Platformsmentioning

confidence: 99%

Conceptual Design and Performance Optimization of a Tip Device for a Regional Turboprop Aircraft

Lappas

Ikenaga

2019

Aerospace

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An increasing number of aircraft is equipped with wing tip devices, which either are installed by the aircraft manufacturer at the production line or are retrofitted after the delivery of the aircraft to its operator. The installation of wing tip devices has not been a popular choice for regional turboprop aircraft, and the novelty of the current study is to investigate the feasibility of retrofitting the British Aerospace (BAe) Jetstream 31 with an appropriate wing tip device (or winglet) to increase its cruise range performance, taking also into account the aerodynamic and structural impact of the implementation. An aircraft model has been developed, and the simulated optimal winglet design achieved a 2.38% increase of the maximum range by reducing the total drag by 1.19% at a mass penalty of 3.25%, as compared with the baseline aircraft configuration. Other designs were found to be more effective in reducing the total drag, but the structural reinforcement required for their implementation outweighed the achieved performance improvements. Since successful winglet retrofit programs for typical short to medium-range narrow-body aircraft report even more than 3% of block fuel improvements, undertaking the project of installing an optimal winglet design to the BAe Jetstream 31 should also consider a direct operating cost (DOC) assessment on top of the aerodynamic and structural aspects of the retrofit.

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“…All e-A320 variants use the fuselage of the baseline A320 and consequently, assuming fixed airspeed, drag differences between the A320 and the e-A320s emerge from dissimilarities of propulsion systems geometry. Civil aircraft aerodynamic drag breakdowns in references [26,27] suggest that skin-friction drag is insignificant during takeoff and landing, where lift-induced drag clearly dominates. It becomes important during cruise, where it comprises about half the total aircraft drag, but still, engine drag is small compared to the wing and body drag.…”

Section: B Drag Considerationsmentioning

confidence: 99%

Preliminary Noise Assessment of Aircraft with Distributed Electric Propulsion

Synodinos

Self

Torija

2018

2018 AIAA/CEAS Aeroacoustics Conference

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Electric and hybrid-electric propulsion technologies in aviation are becoming more attractive for aviation stakeholders not only due to the resulting reduction or elimination of the dependency on oil, whose availability and price are uncertain, but also because they are more reliable and efficient than traditional internal combustion engines. Moreover, combined with distributed electric propulsion (DEP), these technologies have shown potential in significantly reducing civil aircraft community noise impact and contribute towards delivering the strict mid-to-long-term environmental goals set by organisations worldwide, such as ACARE and NASA. This paper examines the noise impact of a concept tube and wing aircraft that falls in the A320 category and features various DEP systems using different power supply units (turboshaft engines or batteries) and number of electric propulsors. Meanwhile, considerations required for the transition from conventional to electric propulsion are discussed. Estimated Noise-Power-Distance (NPD) curves and noise exposure contour maps are also presented. It is concluded that indeed, the propulsors' number is a key parameter for optimising the environmental performance of DEP aircraft and hence maximising the noise benefits. Also, it is shown that based on the entry into service year (2035) technology, totally electric aircraft tend to have a larger noise footprint than aircraft using hybrid electric propulsion systems.

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Prediction of Aerodynamic Drag.

Cited by 19 publications

References 1 publication

Variable cant angle winglets for improvement of aircraft flight performance

Variable cant angle winglets for improvement of aircraft flight performance

Conceptual Design and Performance Optimization of a Tip Device for a Regional Turboprop Aircraft

Preliminary Noise Assessment of Aircraft with Distributed Electric Propulsion

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