Results 91 to 100 of about 444,329 (189)
Preliminary flight-determined subsonic lift and drag characteristics of the X-29A forward-swept-wing airplane [PDF]
The X-29A subsonic lift and drag characteristics determined, met, or exceeded predictions, particularly with respect to the drag polar shapes. Induced drag levels were as great as 20 percent less than wind tunnel estimates, particularly at coefficients ...
Hicks, John W., Huckabine, Thomas
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Design of Hydraulic Induced Bidirectional Coupling Coiled Tubing Drag Reducer
Shiyou jixie, 2020 The low rigidity of the coiled tubing makes it easy to buckle during running or drilling, which leads to increased drag and even locking. To address the problem, based on the Coanda effect and the Carmen vortex effect, a hydraulically induced ...
Dou Yihua +3 more
doaj
Aircraft surface coatings [PDF]
A series of studies in which films and liquid spray-on materials were evaluated in the laboratory for transport aircraft external surface coatings are summarized. Elastomeric polyurethanes were found to best meet requirements.
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PowdersParticles travelling within and interacting with any fluid media are found in both natural phenomena and industrial processes. Through these interactions, the particles experience a drag force, heavily influenced by their morphology, and significantly affecting their dynamics.
Sadaf Maramizonouz, Sadegh Nadimi
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Stochastic Drag Analysis via Polynomial Chaos Uncertainty Quantification
51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2013 In this paper, uncertainty quantification approaches are applied to aerodynamic data analyzed by a far-field drag breakdown approach. By the use of the drag breakdown approach, total drag of an airfoil configuration can be decomposed into three physical and one unphysical drag components, that are wave, viscous, induced and spurious drag components ...
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Experimental and Numerical Investigation of Aerodynamics of Optimum Side-View Mirror Geometries
Applied SciencesIn this numerical and experimental study, the effects of the width, length, and height parameters of a mirror arm on the drag coefficients of two side-view mirror models were investigated.
Onur Yemenici +1 more
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BAe Jetstream 31 Undercarriage Drag Analysis
, 2019 The following report presents the undercarriage drag predictions for the retractable landing gear of the BAE Jetstream 31, operated by the National Flying Laboratory Centre (NFLC) at Cranfield University.A model of the landing gear was incorporated tothe laser scanned model of the aircraft, and Computational Fluid Dynamics (CFD) techniques were used to
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Airframe noise of the DC-9-31 [PDF]
Airframe noise measurements are reported for the DC-9-31 aircraft flown at several speeds and with a number of flap, landing gear, and slat extension configurations.
Bauer, A. B., Munson, A. G.
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A comparison of computer-generated lift and drag polars for a Wortmann airfoil to flight and wind tunnel results [PDF]
Computations of drag polars for a low-speed Wortmann sailplane airfoil are compared to both wind tunnel and flight results. Excellent correlation is shown to exist between computations and flight results except when separated flow regimes were ...
Bowers, A. H., Sandlin, D. R.
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