Simulation Of A Hydrogen Internal Combustion Engine With Cryogenic Mixture Formation

Author : Simon Ellgas
Publisher : Cuvillier Verlag
ISBN 13 : 3867275297
Total Pages : 29 pages
Book Rating : 4.93/5 ( download)

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Download or read book Simulation of a Hydrogen Internal Combustion Engine with Cryogenic Mixture Formation written by Simon Ellgas and published by Cuvillier Verlag. This book was released on 2008 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Günter P. Merker
Publisher : Springer Science & Business Media
ISBN 13 : 3642140947
Total Pages : 660 pages
Book Rating : 4.45/5 ( download)

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Download or read book Combustion Engines Development written by Günter P. Merker and published by Springer Science & Business Media. This book was released on 2011-09-24 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combustion Engines Development nowadays is based on simulation, not only of the transient reaction of vehicles or of the complete driveshaft, but also of the highly unsteady processes in the carburation process and the combustion chamber of an engine. Different physical and chemical approaches are described to show the potentials and limits of the models used for simulation.

Author : Udo Gerke
Publisher : Cuvillier Verlag
ISBN 13 : 3736924992
Total Pages : 232 pages
Book Rating : 4.94/5 ( download)

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Download or read book Numerical Analysis of Mixture Formation and Combustion in a Hydrogen Direct-Injection Internal Combustion Engine written by Udo Gerke and published by Cuvillier Verlag. This book was released on 2008-02-05 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present work investigates the mixture formation and combustion process of a direct-injection (DI) hydrogen internal combustion engine by means of three-dimensional numerical simulation. The study specifies details on the validity of turbulence models, combustion models as well as aspects on the definition of hydrogen-air burning velocities with respect to hydrogen IC engine applications. Results of homogeneous, stratified and multi-injection engine operation covering premixed, partially premixed and non-premixed combustion of hydrogen are presented. Results of the numerical simulations are validated using data of experimental analysis from parallel works, employing a one-cylinder research engine and a research engine with optical access. As a fundamental contribution to combustion modelling of hydrogen IC engines, a new correlation for laminar burning velocities of hydrogen-air mixtures at engine-relevant conditions is derived from measurements of premixed outwards propagating flames conducted in a single-cylinder compression machine. Numerical results of the direct-injection mixture formation give a detailed understanding of the interrelation between injection timing and the degree of mixture homogenisation. A favourable agreement between the computed fuel concentration and results of Planar Laser Induced Fluorescence (PLIF) measurements is reported for various injection timings. Different two-equation turbulence models, a Shear Stress Transport (SST) model and a k-ε model based on Renormalisation Group (RNG) theory as well as a Reynolds Stress Model (RSM) are discussed. The impact of the models on the level of turbulent kinetic energy proves to be of major importance. State-of-the-art turbulent combustion models on the basis of turbulent flame speed closure (TFC) and on the basis of a flame surface density approach, the Extended Coherent Flame Model (ECFM), are examined. The models are adapted to hydrogen internal combustion engines and are interfaced to the established three-dimensional flow field solver ANSYS CFX within the framework of the international research project HyICE. Two different approaches are investigated as input for the laminar burning velocities of hydrogen. Firstly, flame speed data are computed with a kinetic mechanism. Secondly, an existing experimentally derived laminar flame speed correlation is extended to rich air/fuel equivalence ratios (λ 1) and is compared to measurements conducted within the present work. In general, the TFC-models show a satisfying agreement for DI operating points compared to experimental data, when mixing computations are conducted with the SST turbulence model. Also, port fuel injection (PFI) operating points demonstrate a good performance with these models, however, the constant model prefactor (multiplier for the closure of turbulent flame speed) has to be defined individually for PFI and DI computations. This effect might be caused by the dissimilar sources of turbulence for the two engine types (PFI and DI) which cannot be adequately predicted by the turbulence models. Combustion computations on the basis of mixture results obtained by the RNG-model generally underrate the level of turbulence intensity for stratified operation points, effecting too weak rates of heat release. The ECFM combustion model shows a satisfying predictability for the PFI case using a constant model prefactor. Computations of DI operating points with this model, however, require a readjustment of the prefactor for each operating point in order to match experimental results. Regarding turbulent combustion, the hydrogen laminar flame speed is recognised to be the crucial quantity for the employed modelling approaches. Since direct-injection hydrogen engines in the stratified case engender a wide range of equivalence ratios, fundamental data for the laminar flame speed has to be provided as a model input within the entire boundaries of ignition limits. A lack of experimental data of laminar flame speed at engine-relevant conditions (high pressure, high temperature) is noticed. In order to perform a detailed study on hydrogen burning velocities, a single-cylinder compression machine is selected to conduct flame speed measurements of hydrogen-air mixtures at ignition temperatures and pressures up to T = 700 K and p = 45 bar, considering air/fuel equivalence ratios between λ = 0.4 and 2.8. Flame front velocities are acquired by means of optical methods using OH-chemiluminescence and thermodynamic, multi-zone evaluation of pressure traces. In comparison to data of laminar flame speed derived from reaction mechanisms and flame speed correlations found in literature, the experimental results show increased burning velocities due to flame front wrinkling caused by hydrodynamic and thermo-diffusive instabilities. a href="http://ec.europa.eu/research/transport/news/article_5199_en.html" EU Transport Research

Author : Carsten Baumgarten
Publisher : Springer Science & Business Media
ISBN 13 : 9783540308355
Total Pages : 320 pages
Book Rating : 4.50/5 ( download)

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Download or read book Mixture Formation in Internal Combustion Engines written by Carsten Baumgarten and published by Springer Science & Business Media. This book was released on 2006-02-13 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: A systematic control of mixture formation with modern high-pressure injection systems enables us to achieve considerable improvements of the combustion pr- ess in terms of reduced fuel consumption and engine-out raw emissions. However, because of the growing number of free parameters due to more flexible injection systems, variable valve trains, the application of different combustion concepts within different regions of the engine map, etc., the prediction of spray and m- ture formation becomes increasingly complex. For this reason, the optimization of the in-cylinder processes using 3D computational fluid dynamics (CFD) becomes increasingly important. In these CFD codes, the detailed modeling of spray and mixture formation is a prerequisite for the correct calculation of the subsequent processes like ignition, combustion and formation of emissions. Although such simulation tools can be viewed as standard tools today, the predictive quality of the sub-models is c- stantly enhanced by a more accurate and detailed modeling of the relevant pr- esses, and by the inclusion of new important mechanisms and effects that come along with the development of new injection systems and have not been cons- ered so far. In this book the most widely used mathematical models for the simulation of spray and mixture formation in 3D CFD calculations are described and discussed. In order to give the reader an introduction into the complex processes, the book starts with a description of the fundamental mechanisms and categories of fuel - jection, spray break-up, and mixture formation in internal combustion engines.

Author :
Publisher : Cuvillier Verlag
ISBN 13 : 373691167X
Total Pages : 164 pages
Book Rating : 4.73/5 ( download)

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Download or read book CFD Study on Hydrogen Engine Mixture Formation and Combustion written by and published by Cuvillier Verlag. This book was released on 2004-09-20 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: The impending worldwide energy crisis, most importantly the potential crisis of fossil fuels, and the ever increasing environmental impacts caused by automobiles have made it a great necessity to find a clean, regenerative energy form for the future. Hydrogen, the most abundant element in the universe, is being regarded as the most appropriate and promising energy carrier. Hydrogen engine, based on the well-developed IC engine industries, is accepted to be a practical mean to use hydrogen fuel. Focusing on the hydrogen direct injection engine, the whole process, including hydrogen injection, mixture formation, ignition and combustion, is studied and an optimized control strategy is put forward to minimize the NOx emission. Instead of the routine laboratory work, most of the work is carried out with the help of well-known CFD Code AVL FIRE. In order to ensure the simulation results to be reliable, great effort has been put on verification and validation of the Code.

Author : S.A. Sherif
Publisher : CRC Press
ISBN 13 : 1420054503
Total Pages : 1058 pages
Book Rating : 4.07/5 ( download)

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Download or read book Handbook of Hydrogen Energy written by S.A. Sherif and published by CRC Press. This book was released on 2014-07-29 with total page 1058 pages. Available in PDF, EPUB and Kindle. Book excerpt: Can hydrogen and electricity supply all of the world's energy needs? Handbook of Hydrogen Energy thoroughly explores the notion of a hydrogen economy and addresses this question. The handbook considers hydrogen and electricity as a permanent energy system and provides factual information based on science. The text focuses on a large cross section o

Author : Society of Automotive Engineers
Publisher : SAE International
ISBN 13 :
Total Pages : 98 pages
Book Rating : 4.54/5 ( download)

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Download or read book Hydrogen IC Engines written by Society of Automotive Engineers and published by SAE International. This book was released on 2006 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Pierre Duret
Publisher : Editions TECHNIP
ISBN 13 : 9782710808510
Total Pages : 252 pages
Book Rating : 4.1X/5 ( download)

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Download or read book Which Fuels for Low CO2 Engines? written by Pierre Duret and published by Editions TECHNIP. This book was released on 2004 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Throughout the world, research and development in the field of vehicle transportation is increasingly focusing on engine and fuel combinations. The conventional and alternative fuels of the future are seen as fundamental to the development of a new generation of internal combustion engines that attain low well-to-wheel CO2 emissions along with near-zero pollutant emissions. These issues were debated during an international conference whose proceedings are presented in this book. This international conference attracted specialists in the field, including participants from universities, research centres and industry.Contents : Future of liquid fuels, Engine and fuel-related issues in HCCI & CAI combustion, Energy conversion in engines from natural gas, Use of hydrogen in IC engines, Which fuels for low CO2 engines?

Author : Edouard Freund
Publisher : Editions TECHNIP
ISBN 13 : 9782710809845
Total Pages : 370 pages
Book Rating : 4.42/5 ( download)

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Download or read book Hydrogen, the Post-oil Fuel ? written by Edouard Freund and published by Editions TECHNIP. This book was released on 2013 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrogen—is it the energy vector for the future, or on the contrary, limited for many more decades, possibly even until the end of the century, to its current applications in the field of chemistry and refining? Advocates of the hydrogen civilization and the skeptics, even the declared opponents, are deeply divided over this issue. For the first, following a technological revolution, hydrogen would play a universal role alongside electricity in transport, leading to radical elimination of CO2 emissions. For the second, hydrogen will remain restricted to its current applications due to the insoluble problems inherent in its generalized use, especially in transport.

Author : Gunnar Stiesch
Publisher : Springer Science & Business Media
ISBN 13 : 3662087901
Total Pages : 293 pages
Book Rating : 4.09/5 ( download)

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Download or read book Modeling Engine Spray and Combustion Processes written by Gunnar Stiesch and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: The utilization of mathematical models to numerically describe the performance of internal combustion engines is of great significance in the development of new and improved engines. Today, such simulation models can already be viewed as standard tools, and their importance is likely to increase further as available com puter power is expected to increase and the predictive quality of the models is constantly enhanced. This book describes and discusses the most widely used mathematical models for in-cylinder spray and combustion processes, which are the most important subprocesses affecting engine fuel consumption and pollutant emissions. The relevant thermodynamic, fluid dynamic and chemical principles are summarized, and then the application of these principles to the in-cylinder processes is ex plained. Different modeling approaches for the each subprocesses are compared and discussed with respect to the governing model assumptions and simplifica tions. Conclusions are drawn as to which model approach is appropriate for a specific type of problem in the development process of an engine. Hence, this book may serve both as a graduate level textbook for combustion engineering stu dents and as a reference for professionals employed in the field of combustion en gine modeling. The research necessary for this book was carried out during my employment as a postdoctoral scientist at the Institute of Technical Combustion (ITV) at the Uni versity of Hannover, Germany and at the Engine Research Center (ERC) at the University of Wisconsin-Madison, USA.