Download or read book Contribution l tude exp rimentale et num rique de l a rodynamique d un profil en coulement instationnaire bidimensionnel written by Laurence Petit and published by . This book was released on 1995 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book CONTRIBUTION A L ETUDE EXPERIMENTALE ET NUMERIQUE DE L AERODYNAMIQUE D UN PROFIL EN ECOULEMENT INSTATIONNAIRE BIDIMENSIONNEL written by Laurence Petit and published by . This book was released on 1995 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE PRESENT MEMOIRE DE THESE CONCERNE LA SIMULATION EXPERIMENTALE ET NUMERIQUE DU DECROCHAGE DYNAMIQUE D'UN PROFIL OSCILLANT EN ECOULEMENT BIDIMENSIONNEL. L'INSTATIONNARITE EST SIMULEE PAR L'INTERMEDIAIRE D'UN MOUVEMENT COUPLE DE TAMIS-TANGAGE, PERMETTANT DE GENERER DES VARIATIONS SIMULTANEES DE VITESSE ET D'INCIDENCE AUTOUR DU PROFIL DE TYPE OA209. LES CYCLES D'OSCILLATION EN VITESSE ET EN INCIDENCE SONT REPRESENTATIFS DES CONDITIONS REELLES DE DECROCHAGE RENCONTREES PAR LES SECTIONS DE PALE D'UN ROTOR D'HELICOPTERE EN VOL D'AVANCEMENT. L'ANALYSE DE LA REPONSE GLOBALE ET LOCALE DU PROFIL AU MOUVEMENT DE TAMIS-TANGAGE CONDUIT A DEGAGER L'INFLUENCE DE LA SUPERPOSITION DES VARIATIONS DE LA VITESSE ET DE L'INCIDENCE PAR RAPPORT AU MOUVEMENT DE TANGAGE. L'AUGMENTATION DES VALEURS DES PARAMETRES DE L'INSTATIONNARITE MONTRE EN PARTICULIER UN NET ACCROISSEMENT DE L'AMPLITUDE DES BOUCLES D'HYSTERESIS EN PORTANCE, QUI TRADUIT LE FAIT QUE LES PROCESSUS DE DECROCHAGE ENGENDRES PAR LE MOUVEMENT COUPLE SONT DE NATURE DIFFERENTE DE CEUX RESULTANT DES SEULES VARIATIONS D'INCIDENCE. LES DONNEES EXPERIMENTALES ACQUISES EN MOUVEMENT DE TANGAGE ET EN MOUVEMENT COUPLE SONT ENSUITE MISES A PROFIT POUR AMELIORER ET VALIDER DEUX MODELES DE CALCUL DU DECROCHAGE DE NATURE SEMI-EMPIRIQUE (CODE INDICE ET CODE GBCN2D). LES AMELIORATIONS APPORTEES QUANT A L'OPTIMISATION DES JEUX DE CONSTANTES A INTRODUIRE DANS CES CODES, ONT PERMIS D'ABOUTIR A UNE EXCELLENTE PREVISION DES BOUCLES DETERMINEES EXPERIMENTALEMENT EN MOUVEMENT DE TANGAGE ET DE TAMIS-TANGAGE

Download or read book Contribution exp rimentale l a rodynamique automobile written by Adrien Thacker and published by Editions Universitaires Europeennes. This book was released on 2011-12 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: De nouvelles connaissances sur les ecoulements autour des vehicules automobiles doivent aujourd'hui etre apportees pour envisager une amelioration de leurs performances aerodynamiques. Ce travail de these repose sur des etudes experimentales, realisees en soufflerie, permettant l'analyse et la comprehension des mecanismes physiques associes aux ecoulements decolles tridimensionnels et instationnaires se developpant a l'arriere des vehicules automobiles. Il se concentre plus particulierement sur la geometrie generique du corps de Ahmed permettant de reproduire les ecoulements a l'arriere de vehicule de type bicorps (lunette arriere et culot). L'etude permet dans un premier temps de caracteriser les interactions existentes entre les differentes structures de l'ecoulement, et d'analyser dans un second temps les mecanismes instationnaires associes au decollement tridimensionnel se developpant sur la lunette arriere. Ce livre s'adresse a un lectorat averti en mecanique des fluides experimentale et en aerodynamique.

Download or read book Etude num rique et exp rimentale de l coulement instationnaire autour de profils portants written by Anne-France Decaix and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: LE MODELE NUMERIQUE DEVELOPPE DANS CETTE ETUDE VISE A CALCULER LES EFFORTS GLOBAUX DE PORTANCE ET DE TRAINEE, AUXQUELS EST SOUMIS UN PROFIL D'AILE DANS DES CONDITIONS D'ECOULEMENT STATIONNAIRE OU INSTATIONNAIRE. LA METHODE CHOISIE EST UNE METHODE DE COUPLAGE ENTRE UNE ZONE DE FLUIDE PARFAIT ET UNE ZONE DE COUCHE LIMITE. LE COUPLAGE CONSISTE A DETERMINER LA GEOMETRIE DE LA FRONTIERE ENTRE LES DEUX DOMAINES DE CALCUL. UNE MODELISATION DU DECOLLEMENT DE LA COUCHE LIMITE EST PROPOSEE AFIN D'EFFECTUER UN COUPLAGE ITERATIF ET D'ETUDIER LES EFFORTS POUR DES ANGLES D'INCIDENCE SUPERIEURS AUX ANGLES DE DECROCHAGE STATIQUE ET DYNAMIQUE. LA METHODE A ETE VALIDEE DANS LE CAS STATIONNAIRE, PAR DES COMPARAISONS AVEC DES MESURES DE PORTANCE ET TRAINEE ET DE REPARTITIONS DE PRESSION, REALISEES SUR DIFFERENTS PROFILS. DE PLUS, UN NOUVEAU CRITERE DE TRANSITION DE LA COUCHE LIMITE A PU ETRE DEDUIT DE L'ETUDE DE LA TRAINEE ET DES PROFILS DE VITESSE. CETTE METHODE A ENSUITE ETE ETENDUE AU CAS D'UN PROFIL OSCILLANT EN MOUVEMENT DE TANGAGE. LES COEFFICIENTS DE PORTANCE CALCULES MONTRENT UNE BONNE CONCORDANCE AVEC LES MESURES DES HYSTERESIS DE PORTANCE. POUR UNE OSCILLATION S'EFFECTUANT DANS DES CONDITIONS DE DECROCHAGE DYNAMIQUE, LE CALCUL DE LA COUCHE LIMITE N'EST PAS EFFECTUE, ET LA VARIATION DU POINT DE DECOLLEMENT AU COURS D'UNE PERIODE EST DONNEE DE FACON EMPIRIQUE. LES RESULTATS OBTENUS MONTRENT LES CAPACITES DE LA METHODE A PREDIRE LA PORTANCE POUR DES INCIDENCES SUPERIEURES A L'ANGLE DE DECROCHAGE DYNAMIQUE DU PROFIL. TOUTEFOIS, L'IMPORTANCE D'UNE BONNE ESTIMATION DE LA LOCALISATION ET DE L'EVOLUTION DU POINT DE DECOLLEMENT EST MISE EN EVIDENCE DANS CHACUN DES CAS D'ECOULEMENT STATIONNAIRE ET INSTATIONNAIRE

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 Subsonic Aerodynamics written by Ion Paraschivoiu and published by Presses inter Polytechnique. This book was released on 2003 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dynamique Non lin aire Et Le Chaos written by and published by . This book was released on 1993 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Satellite Situation Report written by Goddard Space Flight Center. Office of Public Affairs and published by . This book was released on 1977 with total page 366 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 Space Debris written by Heiner Klinkrad and published by Springer Science & Business Media. This book was released on 2006-09-01 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: The future evolution of the debris environment will be forecast on the basis of traffic models and possible hazard mitigation practices. The text shows how large trackable objects will have re-entry pinpointed and predictions made on related risk assessment for possible ground impact. Models will also be described for meteoroids which are also a prevailing risk.

Download or read book Second International Conference on Artificial Neural Networks 18 20 November 1991 written by and published by . This book was released on 1991 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Second International Conference on Artificial Neural Networks was held November 1991 in the UK. Among the topics: theory, implementations, images, engineering applications, dynamical systems, control and robotics, hybrids, speech and natural language, medical applications, character recognition. No index. Annotation copyrighted by Book News, Inc., Portland, OR.

Download or read book Turbulent Mirror written by John Briggs and published by HarperCollins Publishers. This book was released on 1989 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explores the many faces of chaos and reveals how its laws direct most of the familiar processes of everyday life.

Download or read book Helicopter Aerodynamics written by Raymond W. Prouty and published by . This book was released on 1985 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Sound and Sources of Sound written by A. P. Dowling and published by . This book was released on 1983-01-01 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: