Download or read book tude num rique de la production de gaz de synth se par combustion riche du m thane dans un br leur poreux written by Yann Roussel and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contribution l tude de la combustion de m langes gaz naturel hydrog ne en milieu poreux catalytique written by Ségolène Gauthier and published by . This book was released on 2008 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans le contexte actuel des problèmes environnementaux et de la disponibilité limitée des ressources fossiles, il est nécessaire de développer des brûleurs performants et peu polluants, et d’utiliser des sources d’énergie non fossiles. Cette étude porte sur la combustion de mélanges gaz naturel/hydrogène en milieu poreux catalytiques. En effet, les brûleurs radiants poreux permettent d’obtenir une efficacité élevée et de faibles émissions de polluants. Le comportement de ces brûleurs est cependant complexe et peut être fortement modifié par l’introduction d’hydrogène. L’objectif de cette thèse est dans un premier temps d’étudier le comportement d’un brûleur radiant poreux constitué d’un support poreux de type mousse catalysé ou non et de comprendre les phénomènes en jeu, pour ensuite étudier l’influence de la structure et de la nature du milieu poreux et pouvoir ainsi optimiser le brûleur. Des tests expérimentaux sur quatre mousses différentes (deux mousses métalliques et deux mousses céramiques) et pour des mélanges combustibles contenant de 100% vol. de gaz naturel à 100% vol. d’hydrogène ont été effectués. Ils ont permis de définir les zones de fonctionnement pour chaque support. L’ajout d’hydrogène réduit la zone de fonctionnement du brûleur jusqu’à une disparition complète du mode radiant au-delà de 80% vol d’hydrogène. Un modèle numérique a été développé. Il permet de représenter les zones de fonctionnement obtenues expérimentalement et reproduit l’évolution des émissions de polluants en fonction de la richesse, de la puissance spécifique et de la quantité d’hydrogène. Les phénomènes prenant place au sein du brûleur sont fortement couplés. Ils conditionnent la position du front de combustion et ainsi les performances du brûleur. La diminution de la conductivité thermique, du transfert de chaleur entre la phase gaz et la phase solide et du coefficient d’absorption permettent à la fois de réduire les émissions de CO et de NO et d’augmenter le flux radiatif. Leur variation est cependant limitée par une réduction de la résistance du brûleur à la remontée de la zone de combustion vers l’entrée.

Download or read book Etude physico chimique de la combustion du gaz written by Centre de formation aux techniques gazières (France). and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Industrial Application of Radioisotopes written by Gábor Földiák and published by . This book was released on 1986 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dynamics and Control of Underactuated Multibody Spacecraft written by Sangbum Cho and published by . This book was released on 2002 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Filtering for Some Stochastic Processes with Discrete Observations written by Oleg V. Makhnin and published by . This book was released on 2002 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Guidance Strategies for Microburst Escape written by Atilla Dogan and published by . This book was released on 2000 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance Prediction of a Ducted Rocket Combustor microform written by Robert Alan Stowe and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 2001 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fixed structure Adaptive improvement Control written by Daniel P. Scharf and published by . This book was released on 2001 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Numerical Investigation of Sound Generation in Supersonic Jet Screech written by Ted A. Manning and published by . This book was released on 1999 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Adaptive Harmonic Balance Method for Unsteady Nonlinear One Dimensional Periodic Flows written by Raymond C. Maple and published by . This book was released on 2002-09-01 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new adaptive split-domain harmonic balance computational fluid dynamics (CFD) method is developed to solve highly nonlinear time-periodic flows such as those found in turbomachinery. The basic harmonic balance CFD method transforms an unsteady time-periodic problem into a steady-state problem by assuming a solution in the form of a Fourier series in time. The new method employs a unique multi-domain split-operator solution technique to remove a large-series stability restriction present in previous harmonic balance CFD approaches. In addition, the new method adapts the frequency content to the flow, starting with a small number of Fourier frequencies and augmenting the frequency content in each cell as necessary to capture local flow physics. The method reduces compute times by allowing larger integration time steps, eliminating Fourier transforms, and reducing overall problem size. The stability and accuracy of the method are verified with solutions to the 1-D inviscid Burger's equation and 1-D Euler's equation. Accurate adapted quasi-1-D Euler solutions for a supersonic/subsonic diverging nozzle with periodic unsteady outflow conditions are generated in 86% less time than an equivalent non-adapted split-domain solution, demonstrating the performance benefit of matching frequency content to the local flow conditions.

Download or read book Engine Airframe Integration written by and published by . This book was released on 1992 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Velocity and Vorticity Fields of a Single Stream Shear Layer written by Scott Christopher Morris and published by . This book was released on 2002 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Properties of Spray Formation by Turbulent Primary Breakup written by Khaled A. Sallam and published by . This book was released on 2002 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Investigation of the Physical Vapor Deposition of Titanium written by Jitendra Balakrishnan and published by . This book was released on 2001 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: