Mixing Chemical Reactions And Combustion In High Speed Turbulent Flows PDF Download
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| Author | : |
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| Total Pages | : 0 |
| Release | : 2004 |
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Download Mixing Chemical Reactions and Combustion in High-Speed Turbulent Flows Book in PDF, ePub and Kindle
Research conducted under the sponsorship of this grant focused on fundamental investigations of mixing, chemical-reaction and combustion processes; in turbulent, subsonic, and supersonic flows. Research on hydrocarbon-combustion was on methane and ethane flames. Flame extinction strain-rate measurements, flame speed, and detailed experiment-simulation comparisons indicate difficulties in modeling of fuel-rich flames. Direct Numerical Simulations (DNS) of axisymmetric unsteady flows in both cold and hot impinging jets were also performed. The research included work on high-speed internal flows of interest to scramjet mixing and combustion, aimed at flow-control and flameholding issues. DNS and Large Eddy Simulations (LES) of Rayleigh-Taylor instability flows studied Reynolds number effects on mixing in this important flow. Advances in high-performance digital-imaging systems were transferred to the laboratory environment enabling measurements unachievable by other means.
| Author | : Paul E. Dimotakis |
| Publisher | : |
| Total Pages | : 72 |
| Release | : 1998 |
| Genre | : Gas dynamics |
| ISBN | : |
Download Chemical Reactions in Turbulent Mixing Flows Book in PDF, ePub and Kindle
This program focused on fundamental investigations of mixing, chemical-reaction, and combustion processes, in turbulent, subsonic, and supersonic free-shear flows. The program was comprised of an experimental effort; an analytical, modeling, and computational effort; and a diagnostics, instrumentation, and data-acquisition-development effort, with significant progress in each. With regard to gas-phase shear-layer mixing and combustion, effects of inflow/initial conditions, compressibility, and Reynolds number were experimentally investigated and, to a large extent, clarified. New measures to characterize level sets in turbulence were developed and successfully employed to characterize experimental data of liquid-phase turbulent-jet flows as well as three-dimensional direct-numerical-simulation data of Rayleigh-Taylor-instability flows. The computational effort has added to our understanding of the (H2+NO)/F2 chemical system employed in the shear-layer-mixing investigations as well as mixing in high-speed flows, along with further developments in Riemann-Invariant-Manifold gasdynamic simulation techniques and their application to unsteady detonation phenomena. On the diagnostic front, developments in digital imaging and Image Correlation Velocimetry have continued, and been used to investigate turbulent-jet mixing, the unsteady flow over an accelerating airfoil, to mitigate aliasing problems in the computer reconstruction of (2+1)-dimensional isosurface data, and in other applications.
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| Total Pages | : 49 |
| Release | : 2001 |
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Download Mixing, Chemical Reactions, and Combustion in Subsonic and Supersonic Turbulent Flows Book in PDF, ePub and Kindle
Research conducted under sponsorship of this grant focused on fundamental investigations of mixing, chemical-reaction, and combustion processes, in turbulent, subsonic, and supersonic flows. Research on hydrocarbon-combustion extended previous work highlighting deficiencies in existing chemical-kinetics models for ethylene combustion. Experiments in the 2- and 3-D structure and mixing of turbulent transverse jets yielded new results on isotropy and Reynolds number effects. Work in high-speed flows and subsonic-diffusers demonstrated considerable control via mass injection. Direct numerical simulations of Rayleigh-Taylor instability flows attained the highest Reynolds numbers to date yielding results on mixing and over-all growth rates. Image Correlation Velocimetry was applied to free jets and OH-tagged lines. Advances in high-performance digital-imaging systems were implemented, permitting high frame-rate and high-resolution multi-dimensional data acquisition in many of the experiments.
| Author | : Rustam Ya Deberdeev |
| Publisher | : Smithers Rapra |
| Total Pages | : 334 |
| Release | : 2013-09-02 |
| Genre | : Science |
| ISBN | : 1909030287 |
Download Fast Chemical Reactions in Turbulent Flows Book in PDF, ePub and Kindle
This book describes the fundamentals of fast liquid-phase chemical reactions and the principles of their scientific foundation, technical implementation and industrial application of new technologies. In addition, the equipment required to perform these reactions, in a turbulent mode in the chemical, petrochemical and petroleum industries, is also discussed. The macrokinetic approach has been developed with consideration of the diffusion, hydrodynamics, and heat transfer processes. Due to the advancement of fundamental knowledge, equations of practical engineering importance have been obtained for the calculations of mass and heat transfer processes carried out in conditions of high turbulence, and developed for the implementation in fast chemical reactions involving the synthesis of low molecular weight products and polymers. New methods for controlling the molecular characteristics of polymers have been developed based on the tailored regulation of the hydrodynamics of the reactive mixture flow. Typical processes have been used as model examples to reveal the influence of turbulence on the behaviour of fast chemical reactions used for the synthesis of low molecular weight products, in single-phase and two-phase reactive systems. Brand new tubular devices have been developed with the following characteristics: compact size, high productivity, and a quasi-perfect mixing operation mode in turbulent flows. These devices are subdivided into cylindrical, shell-and-tube, 'zone', and diffuser-confusor designs. Original solutions are proposed for the instrumental implementation of fast liquid-phase processes and development of continuous energy- and resource-efficient technologies for the synthesis of some large-scale compounds.
| Author | : Paul A. Libby |
| Publisher | : |
| Total Pages | : 12 |
| Release | : 1991 |
| Genre | : Combustion |
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Download Theories of Turbulent Combustion in High Speed Flows Book in PDF, ePub and Kindle
| Author | : John Buckmaster |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 639 |
| Release | : 2012-12-06 |
| Genre | : Technology & Engineering |
| ISBN | : 9401110506 |
Download Combustion in High-Speed Flows Book in PDF, ePub and Kindle
This volume contains the proceedings of the Workshop on Com bustion, sponsored by the Institute for Computer Applications in Science and Engineering (ICASE) and the NASA Langley Research Center (LaRC). It was held on October 12-14, 1992, and was the sec ond workshop in the series on the subject. The first was held in 1989, and its proceedings were published by Springer-Verlag under the title "Major Research Topics in Combustion," edited by M. Y. Hussaini, A. Kumar, and R. G. Voigt. The focus of the second workshop was directed towards the development, analysis, and application of basic models in high speed propulsion of particular interest to NASA. The exploration of a dual approach combining asymptotic and numerical methods for the analysis of the models was particularly encouraged. The objectives of this workshop were i) the genesis of models that would capture or reflect the basic pllysical phenomena in SCRAMJETs and/or oblique detonation-wave engines (ODWE), and ii) the stimulation of a greater interaction between NASA exper imental research community and the academic community. The lead paper by D. Bushnell on the status and issues of high speed propulsion relevant to both the SCRAMJET and the ODWE parallels his keynote address which set the stage of the workshop. Following the lead paper were five technical sessions with titles and chairs: Experiments (C. Rogers), Reacting Free Shear Layers (C. E. Grosch), Detonations (A. K. Kapila), Ignition and Struc ture (J. Buckmaster), and Unsteady Behaviour ('1'. L. Jackson).
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| Total Pages | : 126 |
| Release | : 2007 |
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Download Turbulent Mixing and Combustion for High-Speed Air-Breathing Propulsion Application Book in PDF, ePub and Kindle
Work was completed on mixing, chemical-reaction, and combustion processes in turbulent, subsonic, and supersonic flows. Research included high-speed internal flows of interest to scramjet mixing and combustion, aimed at flow-control and flame holding issues. The control authority and mixing in subsonic and transonic flows affected by mass injection and heat release was quantified. In parallel, Large Eddy Simulation (LES) with Sub-Grid Scale (SGS) modeling of these flows was conducted with codes verified against predictions of Linear Stability Analysis (LSA) theory. Research on hydrocarbon combustion was conducted on premixed methane-air, ethane-air, and (diluted) ethylene-air flames. Detailed measurements of flame extinction strain-rate and flame speed were obtained at different compositions at atmospheric pressure. Direct Numerical Simulations (DNS) of axisymmetric unsteady flows in both cold and chemically reacting impinging jets with full chemistry were also performed. Experimental investigations of the three-dimensional full-field structure of scalar dispersion fields in grid turbulence were initiated.
| Author | : R. S. Cant |
| Publisher | : Imperial College Press |
| Total Pages | : 192 |
| Release | : 2008 |
| Genre | : Science |
| ISBN | : 1860947786 |
Download An Introduction to Turbulent Reacting Flows Book in PDF, ePub and Kindle
Provides physical intuition and key entries to the body of literature. This book includes historical perspective of the theories.
| Author | : H. W. Liepmann |
| Publisher | : |
| Total Pages | : 290 |
| Release | : 1979 |
| Genre | : |
| ISBN | : |
Download Chemical Reactions in Turbulent Mixing Book in PDF, ePub and Kindle
The combustion facility (H2-F2) is now nearing completion. As of this writing, a high speed mixing layer has been realized in the test section, using high pressure air. This certifies the flow facility down to and including the test section. Preliminary results on the effect of high heat release in a turbulent mixing zone were obtained in the NO-O3 experiment. These results are consistent with predictions based on previously measured p.d.f, 's in non-reacting mixing layers, but in conspicuous disagreements with a variety of accepted model calculations. These results demonstrate again the important influence of the large scale coherent structures on chemical reactions in turbulent flows. The Laser Induced Fluorescence technique has now been extended to allow direct space and time resolved measurements of the reaction products. The first four channels of the multi-channel laser Doppler velocimetry system are essentially completed. The first experiments using this new development are expected in the course of this summer. Digital image analysis of particle streak photography has also been explored as a direct means of two-dimensional measurements of the velocity field in a plane. Finally, a prototype system using a 100 element acoustic detector array has been completed. Initial measurements with four of these channels using 300 kHz sound have been successfully made. (Author).
| Author | : Robert Brodkey |
| Publisher | : Elsevier |
| Total Pages | : 352 |
| Release | : 2012-12-02 |
| Genre | : Technology & Engineering |
| ISBN | : 0323154689 |
Download Turbulence in Mixing Operations Book in PDF, ePub and Kindle
Turbulence in Mixing Operations: Theory and Application to Mixing and Reaction presents a summary of the current status of research on turbulent motion, mixing, and kinetics. Each chapter of this book discusses turbulence in the context of mixing and reaction in scalar fields. Chapters I and III discuss the classification of turbulent reacting systems and the different possibilities in this context. Chapter II reviews the properties of passive mixing. Chapter IV looks at turbulent mixing in chemically reactive flows. Chapter V uses different techniques to make parallel numerical calculations of both mixing and reaction. Finally, Chapter VI reviews turbulence and actual industrial mixing operations. This book will be of great value for chemical and industrial engineers, especially for those interested in turbulent and industrial mixing.
