Numerical analysis of characteristics of biogas and syngas combustion

International audienceDevelopment of modular adapted energy concept- Gasifier - multi-fuel burner - boilerCharacterization of syngas and biogas flames - Experimentally: stability, pollutant emissions, temperature - Numerically: Calculations of laminar burning velocity, flame temperature, pollutants (NOx, CO)…This poster: some results of calculation

Исследование влияния технологического процесса изготовления обмоток на дефектность корпусной изоляции асинхронных двигателей

В работе проведено исследование влияния колебаний режимов работы статорообмоточных станков WST-660 и пазоизолировочных станков ИПС-3 на дефектность корпусной изоляции. Получены математические модели дефектообразования в корпусной изоляции обмотки с учетом режимов работы технологического оборудования и качества материала корпусной изоляции в состоянии поставки. Установлено, что изменением режимов работы технологического оборудования можно добиться требуемого качества корпусной изоляции при максимальной производительности оборудования

Beitrag zur Optimierung von Prozessparametern fuer Endeffektoren von flexibel automatisierten Montagesystemen des Flugzeugbaus

Die Flugzeugmontage muesste in Zukunft weiter automatisiert werden, um eine wirtschaftlichere Fertigung zu ermoeglichen. So gehen die Bemuehungen des Flugzeugbaus auch dahin, durch Einsatz von Industrierobotern, flexiblen Montagevorrichtungen und Anlagen zur Datenverarbeitung die komplexen Montageablaeufe der Teilehandhabung und -positionierung, das Heften der Teile durch Setzen von Klemmen oder Hohlnieten, das eigentliche ''Ausnieten der Strukturen'' mit Vollnieten sowie das Dichten der Bauteilkanten und -fugen zu automatisieren. Dies leitete die Entwicklung von flexibel automatisierten Montagesystemen im Flugzeugbau ein. Das Ziel der vorliegenden Arbeit ist die Bestimmung und Optimierung von Prozessparametern fuer Endeffektoren, die in einer flexibel automatisierten Montagezelle fuer das Handhaben von Einzelteilen, fuer das Bohren und Nieten sowie fuer das Dichten zum Einsatz kommen. (orig./HM)Aircraft assembly ought to be further automated in the future, in order to permit more economic production. Therefore, efforts in aircraft construction are aimed at automating the complex assembly sequences of component handling and positioning, component fastening by application of clamps or hollow rivets, the actual ''riveting of structures'' with solid rivets and sealing the component edges and joints by means of industry robots, flexible assembly devices, and data processing systems. This has initiated the development of flexibly automated assembly systems in aircraft construction. The objective of the present doctoral thesis is to determine and optimize the process parameters for end effectors used in a flexibly automated assembly cell for component handling, drilling and riveting, and sealing. (orig./HM)SIGLEAvailable from TIB Hannover: H94B832 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Lengths of Lifted Laminar Flames Under Vertical Magnetic Field Gradient

International audienc

Heat Transfer from A Laminar Jet Methane Flame in A Co-Annular Jet of Oxygen-Enriched Air

International audienc

Wirtschaftliche Herstellung von FVW-Flugzeugstrukturen

Published as microficheSIGLEDEGerman

Etude numérique et expérimentale de l'evaporation d'une ou plusieurs gouttes de mélange de carburants dans un écoulement chauffé

The vaporization of one or two multi-component fuel droplets in hot air-stream is presented. A thermal wind tunnel with experimental channel has been designed to develop an experimental process. Firstly, the comparison between experimental results and numerical data is presented for the case of an isolated multi-component droplet. The numerical method is based on the resolution of heat and mass transfer equations between the droplet and the gas stream. This model includes the effect of Stephan flow, the effect of variable thermophysical properties of the components, and the non-unitary Lewis number in the gas film. The experimental results show the micro-explosion phenomenon observed in the liquid phase of multi-component droplet at low temperature. The experimental case of two pure or multi-component droplets in interaction is also presented.On présente un article de synthèse sur l'évaporation d'une ou deux gouttes de carburants à plusieurs composants dans un écoulement d'air chaud. Un dispositif expérimental constitué d'une soufflerie thermique, avec veine d'expérimentation, est réalisé pour permettre cette étude. Pour le cas d'une goutte isolée, une comparaison expérience-calcul est entreprise. Le principe de la méthode numerique consiste en la résolution des équations de transfert de masse et de chaleur entre la goutte et l'écoulement. Ce modèle prend en compte les effets de l'écoulement de Stephan, les variations des propriétés thermophysiques des composants dans les deux phases et la valeur du nombre de Lewis différente de l'unité dans le film de vapeur. Outre l'analyse plus approfondie qu'apporte la confrontation entre le calcul et l'expérience, les résultats expérimentaux montrent le phénomène de micro-explosion observé à l'intérieur de la goutte liquide. Le cas expérimental de deux gouttes en interaction est abordé qu'il s'agisse de gouttes de carburant pur ou de mélange

Experimental Study of EGR Dilution and O 2 Enrichment Effects on Turbulent Non-premixed Swirling Flames

International audienc

STABILITY OF A LAMINAR JET DIFFUSION FLAME OF METHANE IN AN OXYGEN ENRICHED AIR CO-JET

Abstract The effect of adding oxygen in the combustion of a laminar flame methane/air is studied. The volume content of oxygen obtained varies between 21% (air) and 30%. The results relate to the heights of dropping flame based on initial rates of CH 4 , air and oxygen percentages. Stability diagrams showing the states of the flame and transitions between these states are built. The reduction drop observed during the addition of oxygen is explained by the increase in laminar flame speed and increased heat release due to a higher flame temperature. Keywords: laminar diffusion flame -lifted flame -oxygen enriched air -flame stability. Introduction Oxygen is the component of air which plays the dominant role in the combustion reactions. Many studies have been conducted on flames in air enriched with oxygen and several objectives are aimed: increasing the flame temperature and thus improving energy efficiency, reducing fuel consumption, increasing the concentration of CO 2 emissions and reducing emissions of nitrogen oxides. Previous studies have been conducted to examine the effect of this enrichment on flame characteristics: laminar speed boundary extinction, frequency and amplitude of oscillations and vortices instabilities. The effect on the frequency and amplitude of oscillations of the top of the flame was studied by Gotoda et al