Investigation of Fuel Effects and Identification of Representative Behavior of Reacting Fuel Sprays PDF Download
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Author: James P Hubner Publisher: ISBN: Category : Electronic dissertations Languages : en Pages : 0
Book Description
The efficiency and energy density of compression ignition (diesel) engines powered by liquid fuels make them irreplaceable in many applications, and technological and regulatory changes necessitate use of new biofuels and combustion modes to realize the economic and efficiency benefits of diesel engines with reduced emissions. To address these requirements new measurement techniques -- particularly high spatial resolution, high acquisition rate, non-intrusive optical diagnostics -- together with advanced modelling are used to investigate combustion phenomena. The purpose of this research is to implement novel optical diagnostics and analysis techniques to report high-quality data to advance understanding of transient fuel sprays and combustion, and provide improved guidance to facilitate fuel screening and combustion modelling efforts. First, the largest published data-set of diesel-like injections at a single operating condition was collected and analyzed with multiple, simultaneous optical techniques -- Rainbow Schlieren Deflectometry (RSD) and OH* chemiluminescence imaging -- to quantitatively describe a reacting jet. This uniquely large data-set was collected with a constant-pressure flow chamber maintaining diesel-like conditions and flushing combustion products for a high experimental repetition rate. First-stage combustion is described with RSD for the first time, and it is demonstrated that larger data-sets than found elsewhere in literature are required to achieve statistically stationary results. Secondly, primary reference fuels are investigated using aforementioned techniques, a novel two-color pyrometry system, and newly developed analysis techniques to determine Apparent Turbulent Flame Speed (ATFS), an important combustion parameter linked closely to both fuel characteristics and localized turbulent mixing. Third, these techniques were applied to candidate biofuels identified by the Co-Optima project. To improve visualization in cyclic, turbulent combustion, a custom metric was implemented to identify a single, representative injection from each case to facilitate analysis without the over-smoothing effects of image (ensemble) averaging; this greatly improved the ability to differentiate premixed versus diffusion-dominated sooting modes of combustion. Fuel oxygenation and volatility were shown to be significant factors effecting liquid length, mixing behavior, and sooting. The last part of this research details, with a large and statistically significant data-set, the injection-to-injection variation observed by multiple diagnostics between events at identical ambient conditions. Rigorous analysis shows that these fluctuations are due solely to the stochastic nature of turbulence, necessitating the custom metric used in the previous study. That metric is then detailed, producing a new manner in which analysis of transient, turbulent, reacting jets can be accomplished for improved results and reliability.
Author: James P Hubner Publisher: ISBN: Category : Electronic dissertations Languages : en Pages : 0
Book Description
The efficiency and energy density of compression ignition (diesel) engines powered by liquid fuels make them irreplaceable in many applications, and technological and regulatory changes necessitate use of new biofuels and combustion modes to realize the economic and efficiency benefits of diesel engines with reduced emissions. To address these requirements new measurement techniques -- particularly high spatial resolution, high acquisition rate, non-intrusive optical diagnostics -- together with advanced modelling are used to investigate combustion phenomena. The purpose of this research is to implement novel optical diagnostics and analysis techniques to report high-quality data to advance understanding of transient fuel sprays and combustion, and provide improved guidance to facilitate fuel screening and combustion modelling efforts. First, the largest published data-set of diesel-like injections at a single operating condition was collected and analyzed with multiple, simultaneous optical techniques -- Rainbow Schlieren Deflectometry (RSD) and OH* chemiluminescence imaging -- to quantitatively describe a reacting jet. This uniquely large data-set was collected with a constant-pressure flow chamber maintaining diesel-like conditions and flushing combustion products for a high experimental repetition rate. First-stage combustion is described with RSD for the first time, and it is demonstrated that larger data-sets than found elsewhere in literature are required to achieve statistically stationary results. Secondly, primary reference fuels are investigated using aforementioned techniques, a novel two-color pyrometry system, and newly developed analysis techniques to determine Apparent Turbulent Flame Speed (ATFS), an important combustion parameter linked closely to both fuel characteristics and localized turbulent mixing. Third, these techniques were applied to candidate biofuels identified by the Co-Optima project. To improve visualization in cyclic, turbulent combustion, a custom metric was implemented to identify a single, representative injection from each case to facilitate analysis without the over-smoothing effects of image (ensemble) averaging; this greatly improved the ability to differentiate premixed versus diffusion-dominated sooting modes of combustion. Fuel oxygenation and volatility were shown to be significant factors effecting liquid length, mixing behavior, and sooting. The last part of this research details, with a large and statistically significant data-set, the injection-to-injection variation observed by multiple diagnostics between events at identical ambient conditions. Rigorous analysis shows that these fluctuations are due solely to the stochastic nature of turbulence, necessitating the custom metric used in the previous study. That metric is then detailed, producing a new manner in which analysis of transient, turbulent, reacting jets can be accomplished for improved results and reliability.
Author: United States. Congress. House Publisher: ISBN: Category : Legislation Languages : en Pages : 1692
Book Description
Some vols. include supplemental journals of "such proceedings of the sessions, as, during the time they were depending, were ordered to be kept secret, and respecting which the injunction of secrecy was afterwards taken off by the order of the House."
Author: Guan Heng Yeoh Publisher: Elsevier ISBN: 0080914896 Category : Computers Languages : en Pages : 658
Book Description
Mixed or multiphase flows of solid/liquid or solid/gas are commonly found in many industrial fields, and their behavior is complex and difficult to predict in many cases. The use of computational fluid dynamics (CFD) has emerged as a powerful tool for the understanding of fluid mechanics in multiphase reactors, which are widely used in the chemical, petroleum, mining, food, beverage and pharmaceutical industries. Computational Techniques for Multiphase Flows enables scientists and engineers to the undertand the basis and application of CFD in muliphase flow, explains how to use the technique, when to use it and how to interpret the results and apply them to improving aplications in process enginering and other multiphase application areas including the pumping, automotive and energy sectors. Understandable guide to a complex subject Important in many industries Ideal for potential users of CFD
Author: C.B. Jenssen Publisher: Gulf Professional Publishing ISBN: 0080538401 Category : Science Languages : en Pages : 601
Book Description
Parallel CFD 2000, the Twelfth in an International series of meetings featuring computational fluid dynamics research on parallel computers, was held May 22-25, 2000 in Trondheim, Norway.Following the trend of the past conferences, areas such as numerical schemes and algorithms, tools and environments, load balancing, as well as interdisciplinary topics and various kinds of industrial applications were all well represented in the work presented. In addition, for the first time in the Parallel CFD conference series, the organizing committee chose to draw special attention to certain subject areas by organizing a number of special sessions.We feel the emphasis of the papers presented at the conference reflect the direction of the research within parallel CFD at the beginning of the new millennium. It seems to be a clear tendency towards increased industrial exploitation of parallel CFD. Several presentations also demonstrated how new insight is being achieved from complex simulations, and how powerful parallel computers now make it possible to use CFD within a broader interdisciplinary setting.Obviously, successful application of parallel CFD still rests on the underlying fundamental principles. Therefore, numerical algorithms, development tools, and parallelization techniques are still as important as when parallel CFD was in is infancy. Furthermore, the novel concepts of affordable parallel computing as well as metacomputing show that exciting developments are still taking place.As is often pointed out however, the real power of parallel CFD comes from the combination of all the disciplines involved: Physics, mathematics, and computer science. This is probably one of the principal reasons for the continued popularity of the Parallel CFD Conferences series, as well as the inspiration behind much of the excellent work carried out on the subject. We hope that the papers in this book, both on an individual basis and as a whole, will contribute to that inspiration. Further details of Parallel CFD'99, as well as other conferences in this series, are available at http://www.parcfd.org
Author: James P Hubner
Author: James P Hubner
Author: Society of Automotive Engineers
Author: United States. Congress. House
Author: Kenneth K. Kuo
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Author: 
Author: Guan Heng Yeoh
Author: C.B. Jenssen
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