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Author: Yacine Babou Publisher: ISBN: Category : Languages : en Pages : 250
Book Description
The prediction of radiative transfers is required in many applications such as the re-entry of space vehicles in the atmosphere. The present work is articulated around three large axes devoted to the study of the radiation emitted from CO2-N2 plasmas for Martian atmospheric entry applications. The first part is dedicated to the construction of spectroscopic databases useful for high resolution radiation prediction of CO2-N2 mixtures for temperatures ranging from 2000 K to 50000 K. The work was especially focused on the construction of exhaustive data related to bound-bound radiative transitions of CO2, CO, CO+ and CN molecules.The second part is dedicated to the presentation and the exploitation of an experimental bench including a microwave plasma torch working at atmospheric pressure. Optical diagnostic benches for emission spectroscopy in the UV, visible and near infrared are used. Measured spectra for CO2 and CO2(97%)-N2(3%) plasmas, were analysed in order to characterise the thermodynamic state. The plasma was found at the equilibrium and the temperature of the CO2 and CO2(97%)-N2(3%) plasmas was found to be at 5400 K and 6500 K respectively. In the third part, a radiative properties model is developed suitable for the prediction of radiative in the framework of multi-temperature description of the thermodynamic state of the atmospheric entry plasma. This approach is combined with the available spectroscopic databases in order to predict radiative transfer for Mars and Earth atmospheric entry.
Author: Yacine Babou Publisher: ISBN: Category : Languages : en Pages : 250
Book Description
The prediction of radiative transfers is required in many applications such as the re-entry of space vehicles in the atmosphere. The present work is articulated around three large axes devoted to the study of the radiation emitted from CO2-N2 plasmas for Martian atmospheric entry applications. The first part is dedicated to the construction of spectroscopic databases useful for high resolution radiation prediction of CO2-N2 mixtures for temperatures ranging from 2000 K to 50000 K. The work was especially focused on the construction of exhaustive data related to bound-bound radiative transitions of CO2, CO, CO+ and CN molecules.The second part is dedicated to the presentation and the exploitation of an experimental bench including a microwave plasma torch working at atmospheric pressure. Optical diagnostic benches for emission spectroscopy in the UV, visible and near infrared are used. Measured spectra for CO2 and CO2(97%)-N2(3%) plasmas, were analysed in order to characterise the thermodynamic state. The plasma was found at the equilibrium and the temperature of the CO2 and CO2(97%)-N2(3%) plasmas was found to be at 5400 K and 6500 K respectively. In the third part, a radiative properties model is developed suitable for the prediction of radiative in the framework of multi-temperature description of the thermodynamic state of the atmospheric entry plasma. This approach is combined with the available spectroscopic databases in order to predict radiative transfer for Mars and Earth atmospheric entry.
Book Description
CE TRAVAIL CONSISTE A CALCULER LA PUISSANCE TRANSPORTEE PAR RAYONNEMENT DANS LES PLASMAS THERMIQUES ETABLIS DANS UN GAZ A UNE SEULE ESPECE OU A PLUSIEURS ESPECES. CE CALCUL A ETE EFFECTUE A PARTIR DE L'EQUATION DU TRANSFERT RADIATIF QUI EST DIFFICILE A RESOUDRE A CAUSE DE LA COMPLEXITE DE LA REPARTITION SPECTRALE DU RAYONNEMENT ET DE L'EXISTENCE DES GRADIENTS DE TEMPERATURE, DE PRESSION ET DE CONCENTRATION. POUR CES RAISONS, LE CALCUL DU TRANSFERT RADIATIF A ETE BASE SUR DES METHODES APPROXIMATIVES. ON SUPPOSE QUE LE MILIEU EST EN E.T.L. ET NON DIFFUSIF ET ON A DEVELOPPE LES METHODES SUIVANTES: - METHODE DU COEFFICIENT D'EMISSION NETTE, EN MILIEU HOMOGENE ET ISOTHERME, QUI A ETE APPLIQUEE AU CAS D'UN PLASMA D'ARC ELECTRIQUE POUR LES GAZ SUIVANTS: HYDROGENE, CARBONE, OXYGENE, VAPEUR D'EAU, MELANGES ARGON-CARBONE, FLUORURES DE CARBONE (CF#4 OU C#2F#6) ET MELANGES HEXAFLUORURE DE SOUFRE-CF#4 OU C#2F#6 AVEC DES TEMPERATURES ALLANT DE 5 000 A 30 000 K ET UNE PRESSION DE 0,05 A 1,6 MPA. CETTE METHODE PERMET DE CALCULER AVEC UNE ASSEZ BONNE PRECISION, LA TEMPERATURE DANS LES REGIONS LES PLUS CHAUDES. LES RESULTATS DE CETTE APPROCHE MONTRENT D'UNE PART QUE LE CARBONE EST PLUS EMISSIF QUE LES AUTRES ESPECES ETUDIEES ICI ET D'AUTRE PART QUE LE RAYONNEMENT NET D'UN MELANGE DE DEUX ESPECES N'EST PAS SYSTEMATIQUEMENT PROPORTIONNEL AUX VALEURS DU RAYONNEMENT DES DEUX ESPECES. - METHODE DU CORPS GRIS DANS DIFFERENTES BANDES DE FREQUENCE (OU DE LONGUEUR D'ONDE): ELLE EST FONDEE SUR LE DECOUPAGE DU SPECTRE DE FREQUENCE EN QUELQUES BANDES SPECTRALES EN SUPPOSANT QUE SUR CHAQUE BANDE SPECTRALE, LE COEFFICIENT D'ABSORPTION TOTAL EST CONSTANT A L'INTERIEUR D'UNE BANDE, POUR UNE TEMPERATURE DONNEE. CETTE ETUDE A ETE APPLIQUEE AUX PLASMAS THERMIQUES ETABLIS DANS L'HYDROGENE, LE METHANE, L'HEXAFLUORURE DE SOUFRE (SF#6) ET LES MELANGES SF#6-CUIVRE. - METHODE DES CARACTERISTIQUES PARTIELLES: ELLE TRAITE LE TRANSFERT RADIATIF EN TENANT COMPTE A LA FOIS DE LA STRUCTURE REELLE DU SPECTRE ET DES GRADIENTS DE TEMPERATURE OU DES DENSITES DE PARTICULES. CETTE METHODE EST PLUS PERFORMANTE MAIS PLUS LOURDE QUE LES DEUX PRECEDENTES ET A ETE APPLIQUEE A L'HYDROGENE ET LE METHANE. CES DEUX DERNIERES APPROCHES CONSISTENT A ETABLIR DES BANQUES DE DONNEES EN FONCTION DE LA TEMPERATURE VARIANT DE 300 A 30 000 K ET DE PRESSION DE 0,1 A 1 MPA. CES DONNEES SONT ENSUITE UTILISEES DANS DES MODELES D'ARC POUR ETUDIER L'EMISSION ET L'ABSORPTION DU RAYONNEMENT DANS LES PLASMAS THERMIQUES. LES RESULTATS MONTRENT, DANS LE CAS MONODIMENSIONNEL ET SUIVANT UN PROFIL DE TEMPERATURE, UNE FORTE ABSORPTION DU RAYONNEMENT DANS LE GAZ FROID, LORSQUE L'ARC EST ETABLI DANS UN GAZ MOLECULAIRE. DANS LES REGIONS FROIDES D'UN MILIEU DE METHANE, L'ABSORPTION EST TRES IMPORTANTE DANS L'UV ET PEUT ATTEINDRE 90% DU RAYONNEMENT EMIS PAR LES REGIONS CHAUDES
Author: Maher I. Boulos Publisher: Springer Nature ISBN: 3030849368 Category : Science Languages : en Pages : 1973
Book Description
This authoritative reference presents a comprehensive review of the evolution of plasma science and technology fundamentals over the past five decades. One of this field’s principal challenges has been its multidisciplinary nature requiring coverage of fundamental plasma physics in plasma generation, transport phenomena under high-temperature conditions, involving momentum, heat and mass transfer, and high-temperature reaction kinetics, as well as fundamentals of material science under extreme conditions. The book is structured in five distinct parts, which are presented in a reader-friendly format allowing for detailed coverage of the science base and engineering aspects of the technology including plasma generation, mathematical modeling, diagnostics, and industrial applications of thermal plasma technology. This book is an essential resource for practicing engineers, research scientists, and graduate students working in the field.
Book Description
LE CALCUL DU TRANSFERT RADIATIF CONSTITUE UNE ETAPE ESSENTIELLE DANS LA MODELISATION NUMERIQUE DES PLASMAS THERMIQUES. LE RAYONNEMENT DEPEND FORTEMENT DE LA NATURE DU GAZ DANS LEQUEL IL EST ETABLI ET PEUT JOUER UN ROLE IMPORTANT DANS DIVERSES APPLICATIONS. DANS LE CAS D'UN GAZ MOLECULAIRE TEL QUE L'AIR, LE RAYONNEMENT EMIS PAR LES REGIONS CHAUDES EST FORTEMENT ABSORBE DANS LES REGIONS FROIDES PAR LES MOLECULES. IL EXISTE DE NOMBREUSES APPLICATIONS FAISANT INTERVENIR DES PLASMAS ETABLIS DANS L'AIR : TORCHES A PLASMA POUR LA PROJECTION ; PLASMAS DE RENTREE ATMOSPHERIQUE ; FOURS A ARC EN SIDERURGIE ET LA SYNTHESE DE NO EN CHIMIE. LE CALCUL DU RAYONNEMENT S'EFFECTUE A PARTIR DE L'EQUATION DU TRANSFERT RADIATIF QUI EST DIFFICILE A RESOUDRE A CAUSE DE LA COMPLEXITE DE LA REPARTITION SPECTRALE DU RAYONNEMENT ET DE L'EXISTENCE DES GRADIENTS DE TEMPERATURE, DE PRESSION ET DE CONCENTRATION. UNE PART IMPORTANTE DE CE TRAVAIL DE THESE CONCERNE L'ETUDE DES BANDES MOLECULAIRES DE L'AIR EMISES PAR LES ESPECES N 2, O 2, NO, N 2 +. DEUX METHODES APPROCHEES DE CALCUL DU TRANSFERT RADIATIF ONT ETE PRESENTEES DANS CE TRAVAIL, EN SUPPOSANT LE MILIEU EN EQUILIBRE THERMODYNAMIQUE LOCAL : - METHODE DU COEFFICIENT D'EMISSION NETTE EN MILIEU HOMOGENE ET ISOTHERME QUI PERMET DE CALCULER LA TEMPERATURE DANS LES REGIONS CHAUDES AVEC UNE PRECISION CONVENABLE. - METHODE DU COEFFICIENT MOYEN D'ABSORPTION QUI CONSISTE A DECOUPER LE SPECTRE DE FREQUENCE EN QUELQUES INTERVALLES EN SUPPOSANT QUE SUR CHAQUE INTERVALLE SPECTRAL LE COEFFICIENT D'ABSORPTION TOTAL RESTE CONSTANT. LES BANQUES DE DONNEES OBTENUES PAR CES DEUX METHODES ONT ETE APPLIQUEES AU CALCUL DU TRANSFERT RADIATIF DANS LE CAS SIMPLE MONODIMENTIONNEL ET SUIVANT UN PROFIL DE TEMPERATURE. IL EST MONTRE QUE L'ABSORPTION EST TRES IMPORTANTE DANS LA GAMME U.V. ET QU'UNE FAIBLE EPAISSEUR D'AIR FROID AUTOUR DU PLASMA AUGMENTE CONSIDERABLEMENT L'ABSORPTION.
Author: Ahmed Belasri Publisher: Springer Nature ISBN: 9811554447 Category : Technology & Engineering Languages : en Pages : 659
Book Description
This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Author: Valerio Bozza Publisher: Springer ISBN: 3319274589 Category : Science Languages : en Pages : 262
Book Description
In this book, renowned scientists describe the various techniques used to detect and characterize extrasolar planets, or exoplanets, with a view to unveiling the “tricks of the trade” of planet detection to a wider community. The radial velocity method, transit method, microlensing method, and direct imaging method are all clearly explained, drawing attention to their advantages and limitations and highlighting the complementary roles that they can play in improving the characterization of exoplanets’ physical and orbital properties. By probing the planetary frequency at different distances and in different conditions, these techniques are helping astrophysicists to reconstruct the scenarios of planetary formation and to give robust scientific answers to questions regarding the frequency of potentially habitable worlds. Twenty years have passed since the discovery of a Jupiter-mass companion to a main sequence star other than the Sun, heralding the birth of extrasolar planetary research; this book fully conveys the exciting progress that has been achieved during the intervening period.
Author: Pierre Sagaut Publisher: World Scientific ISBN: 1848169876 Category : Science Languages : en Pages : 446
Book Description
The book aims to provide the reader with an updated general presentation of multiscale/multiresolution approaches in turbulent flow simulations. All modern approaches (LES, hybrid RANS/LES, DES, SAS) are discussed and recast in a global comprehensive framework. Both theoretical features and practical implementation details are addressed. Some full scale applications are described, to provide the reader with relevant guidelines to facilitate a future use of these methods.
Author: Yacine Babou
Author: Yacine Babou
Author: Hassan Riad
Author: Maher I. Boulos
Author: YASMAN.. NAGHIZADEH KASHANI
Author: Ahmed Belasri
Author: 
Author: 
Author: Valerio Bozza
Author: Pierre Sagaut
Author: K. N. Palmer