Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 40

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Author: Thomas J. Mueller
Publisher: Springer Science & Business Media
ISBN: 3642840108
Category : Science
Languages : en
Pages : 456

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Current interest in a variety of low Reynolds number applications has focused attention on the design and evaluation of efficient airfoil sections at chord Reynolds numbers from about 100,000 to about 1,000,000. These applications include remotely piloted vehicles (RPVs) at high altitudes, sailplanes, ultra-light man-carrying/man powered aircraft, mini-RPVs at low altitudes and wind turbines/propellers. The purpose of this conference was to bring together those researchers who have been active in areas closely related to this subject. All of the papers presented are research type papers. Main topics are: Airfoil Design and Analysis, Computational Studies, Stability and Transition, Laminar Separation Bubble, Steady and Unsteady Wind Tunnel Experiments and Flight Experiments.

Author: Michael S. Selig
Publisher: Soartech
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 320

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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 380

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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Author: Mark Barnett
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 112

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Author: M. Burnett
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 112

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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722893620
Category :
Languages : en
Pages : 166

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In predicting the aerodynamic characteristics of airfoils operating at low Reynolds numbers, it is often important to account for the effects of laminar (transitional) separation bubbles. Previous approaches to the modelling of this viscous phenomenon range from fast but sometimes unreliable empirical correlations for the length of the bubble and the associated increase in momentum thickness, to more accurate but significantly slower displacement-thickness iteration methods employing inverse boundary-layer formulations in the separated regions. Since the penalty in computational time associated with the more general methods is unacceptable for airfoil design applications, use of an accurate yet computationally efficient model is highly desirable. To this end, a semi-empirical bubble model was developed and incorporated into the Eppler and Somers airfoil design and analysis program. The generality and the efficiency was achieved by successfully approximating the local viscous/inviscid interaction, the transition location, and the turbulent reattachment process within the framework of an integral boundary-layer method. Comparisons of the predicted aerodynamic characteristics with experimental measurements for several airfoils show excellent and consistent agreement for Reynolds numbers from 2,000,000 down to 100,000. Dini, Paolo and Maughmer, Mark D. Unspecified Center AERODYNAMIC CHARACTERISTICS; BOUNDARY LAYER SEPARATION; BOUNDARY LAYERS; BUBBLES; DESIGN ANALYSIS; MATHEMATICAL MODELS; PREDICTION ANALYSIS TECHNIQUES; TURBULENCE; AIRFOILS; ITERATION; LOW REYNOLDS NUMBER; MOMENTUM; THICKNESS...

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 48

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A number of airfoils intended for VTOL/Rotorcraft applications were tested in the Penn State Low-Speed, Low-Turbulence Wind Tunnel, and the results of these tests compared with those predicted using several well-known theoretical methods. The airfoils considered are the E 387 and the S406, S407, S411, S414, and the S415, and the theoretical methods used are the potential-flow/integral boundary-layer methods, PROFIL07 and XFOIL 6.94, the Euler solver/integral boundary-layer method, MSES 3.05, and the Reynolds-averaged Navier-Stokes solver, OVERFLOW 2.1ae. In addition, several cases were considered using the Navier-Stokes solver, FLUENT 12.1.2, which incorporates the Langtry-Menter four-equation turbulence model that has demonstrated some capability of capturing the transition process. While none of the methods considered was consistently the best overall, the drag predictions of the codes incorporating boundary-layer methods generally agreed better with the experimental results than did those of the Navier-Stokes solvers. All of the theoretical methods frequently over-predicted the maximum lift coefficient, although an empirical criterion developed for use with PROFIL yielded reasonably close agreement with the measurements. The Langtry-Menter turbulence model employed in FLUENT 12.1.2 shows promise in being able to model the transition process, including the development of laminar separation bubbles.

Author: Mustafa Serdar Genç
Publisher: BoD – Books on Demand
ISBN: 9535104926
Category : Science
Languages : en
Pages : 176

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Book Description
This book reports the latest development and trends in the low Re number aerodynamics, transition from laminar to turbulence, unsteady low Reynolds number flows, experimental studies, numerical transition modelling, control of low Re number flows, and MAV wing aerodynamics. The contributors to each chapter are fluid mechanics and aerodynamics scientists and engineers with strong expertise in their respective fields. As a whole, the studies presented here reveal important new directions toward the realization of applications of MAV and wind turbine blades.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 82

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