Download or read book Sch mas num riques pr servant la vorticit en a rodynamique compressible written by Fabrice Falissard and published by . This book was released on 2006 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: La réduction de la diffusion numérique des structures tourbillonnaires est un point clé de la simulation de nombreux problèmes de Mécanique des fluides. S’appuyant d’une part sur la notion définie par Morton et Roe de schéma numérique préservant exactement la vorticité pour les équations de l’acoustique et d’autre part sur une forme de schémas basés sur le résidu introduits par Lerat et Corre, cette thèse présente un schéma RBV (Residual-Based Vorticity preserving), d’ordre 2 implicite basé sur le résidu qui préserve la vorticité pour les équations de l’acoustique, de l’acoustique avec advection et les équations d’Euler. Le schéma RBV permet d’advecter un tourbillon sur de longues distances avec très peu de diffusion numérique. Il a été formulé en maillage curviligne dans l’approche des volumes finis et, par construction, conserve son ordre de précision et ses propriétés de préservation de la vorticité en maillage irrégulier sans nécessiter de termes correctifs. Le schéma RBV a été appliqué à des calculs d’écoulements stationnaires et instationnaires autour de profil pour les équations d’Euler, puis au cas de l’interaction frontale, subsonique instationnaire, entre un tourbillon de Scully et un profil NACA0012 à incidence nulle pour lequel existent des données expérimentales. Ce problème modèle est représentatif de l’interaction parallèle entre une pale de rotor d’hélicoptère et le tourbillon émis en extrémité d’une pale précédente, qui est à l’origine du bruit BVI (« Blade Vortex Interaction noise »). Les résultats obtenus avec le schéma RBV sur ce cas d’interaction pale tourbillon 2D démontrent la capacité de la méthode à simuler des écoulements aérodynamiques réalistes.
Download or read book The Theory of Propellers written by Theodore Theodorsen and published by . This book was released on 1944 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary: A technical method is given for calculating the axial interference velocity of a propeller. The method involves the use of certain weight functions P, Q, and F. Numerical values for the weight functions are given for two-blade, three-blade, and six-blade propellers.
Download or read book Aerodynamics and aeroacoustics of rotorcraft written by and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rotorcraft System Identification written by and published by . This book was released on 1991 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transonic Aerodynamics written by L. Pamela Cook and published by SIAM. This book was released on 1993-01-01 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume offers exciting results, perspectives, and case studies for the treatment of problems arising in transonic aerodynamics. New advances including triple deck theory, analysis of stagnation at the nose of a body, transonic choked flow, and the transonic area rule are presented. Interest in analyzing the transonic range of flight, its stability properties, and especially the question of designing reduced drag (shockless or weak shock) airfoils keeps growing. Present day commercial aircraft cruise in the transonic range. Mechanical and aeronautical engineers interested in compressible fluid flows, design of optimal wings, and an understanding of transonic flow held about wings and airfoils will find the book invaluable. This book is understandable to those with a knowledge of continuum mechanics (fluids) and asymptotic methods. It is appropriate for graduate courses in aerodynamics and mathematical methods.
Download or read book Special Course on Aircraft Dynamics at High Angles of Attack Experiments and Modelling written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Fluid Dynamics Panel. Special Course and published by . This book was released on 1991 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This report consists of lecture notes of an AGARD Fluid Dynamics Panel Special Course. These notes provide the latest information on the development and use of dynamic experiments in wind tunnels from several of the NATO nations. They address current oscillatory and rotary test techniques, experimental results for typical configurations, and the use of these data for flight mechanics applications. Subject included are: dynamic lift, wing rock, fluid dynamics of rotary flows, mathematical modelling, non-linear data representation, vortex manipulation for control enhancement, and correlations of predictions based on rotary and oscillatory wind-tunnel and flight-test results. The complete course notes are contained in two volumes. The main part of the notes is contained in AGARD Advisory Report 265 (ADA235179). The present volume includes papers on: Unsteady aerodynamics of slender wings; Dynamic stall effects and applications to high performance aircraft; Oscillatory test techniques; Large amplitude oscillations; Oscillatory data for typical configurations; and Forebody vortex control."--Stinet.
Download or read book Wind Turbine Aerodynamics written by HERMAN. SNEL and published by Wiley-Blackwell. This book was released on 2020-02-14 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
