Turbulence Characteristics of an Axisymmetric Reacting Flow PDF Download
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Author: Richard D. Gould
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 220
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Book Description
Author: Richard D. Gould
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 220
Get Book Here
Book Description
Author: Richard D. Gould
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 218
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Experiments have been carried out in plane and axisymmetric sudden-expansion flows to quantify velocity characteristics in isothermal and reacting flows and temperature and emission characteristics in the reacting flows, to establish flammability and stability limits, to determine the acoustic characteristics and their importance to large-amplitude oscillations and to examine the nature of extinction. Flow visualization and detailed measurements quantified the asymmetry of the plane flows and the extent to which it was removed by combustion. Longitudinal waves dominated the flows in both ducts for an extensive range of equivalence ratios and active control was successful in reducing amplitudes except where the frequencies were broad band as at higher equivalence ratios and close to flammability limits. Close to these limits, oscillations existed with frequencies much lower than those associated with acoustic or bulk-mode frequencies and with modulation rather than the single-frequency oscillations associated with equivalence ratios between around 0.75 and 1.2. Models of the combustor of a land-based gas turbine were examined, one with an annular main flow and a central pilot flow and the other with swirl stabilization. in the first arrangement, the movement of flame stabilization from the annular ring to the back step was important and, in the latter, the position of stabilization also moved but this time axially with increasing load so that the fixed position of the actuator for active control proved to be satisfactory for some load conditions and less so for others.
Author: R. Borghi
Publisher: Springer Science & Business Media
ISBN: 146139631X
Category : Science
Languages : en
Pages : 958
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Book Description
Turbulent reactive flows are of common occurrance in combustion engineering, chemical reactor technology and various types of engines producing power and thrust utilizing chemical and nuclear fuels. Pollutant formation and dispersion in the atmospheric environment and in rivers, lakes and ocean also involve interactions between turbulence, chemical reactivity and heat and mass transfer processes. Considerable advances have occurred over the past twenty years in the understanding, analysis, measurement, prediction and control of turbulent reactive flows. Two main contributors to such advances are improvements in instrumentation and spectacular growth in computation: hardware, sciences and skills and data processing software, each leading to developments in others. Turbulence presents several features that are situation-specific. Both for that reason and a number of others, it is yet difficult to visualize a so-called solution of the turbulence problem or even a generalized approach to the problem. It appears that recognition of patterns and structures in turbulent flow and their study based on considerations of stability, interactions, chaos and fractal character may be opening up an avenue of research that may be leading to a generalized approach to classification and analysis and, possibly, prediction of specific processes in the flowfield. Predictions for engineering use, on the other hand, can be foreseen for sometime to come to depend upon modeling of selected features of turbulence at various levels of sophistication dictated by perceived need and available capability.
Author: Epaminondas Mastorakos
Publisher: World Scientific Publishing Company
ISBN: 1911298429
Category : Technology & Engineering
Languages : en
Pages : 192
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Book Description
This book provides physical intuition and key entries to the ever-growing body of literature on turbulent reacting flows. It is of a tutorial nature and includes some historical perspective of the theories developed over the past 30 years. A selection of basic and advanced materials is used to build the necessary background and emphasize some of the main concepts that the student or newcomer to the field of turbulent reacting flows should know, thus facilitating further study of specialized research papers and research monographs. A range of exercises is also provided in order to consolidate the student's understanding./a
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781725097698
Category :
Languages : en
Pages : 32
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Book Description
The paper presents a numerical method for the solution of the conservation equations governing steady, reacting, turbulent viscous flow in two-dimensional geometries, in both Cartesian and axisymmetric coordinates. These equations are written in Favre-averaged form and closed with a first order model. A two-equation K-epsilon model, where low Reynolds number and compressibility effects are included, and a modified eddy-break up model are used to simulate fluid mechanics turbulence, chemistry and turbulence-combustion interaction. The solution is obtained by using a pseudo-unsteady method with improved perturbation propagation properties. The equations are discretized in space by using a finite volume formulation. An explicit multi-stage dissipative Runge-Kutta algorithm is then used to advance the flow equations in the pseudo-time. The method is applied to the computation of both diffusion and premixed turbulent reacting flows. The computed temperature distributions compare favorably with experimental data. Boretti, A. A. Glenn Research Center NASA-TM-101945, E-4635, NAS 1.15:101945 RTOP 505-62-21...
Author: G. Turpin
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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Book Description
Author: Paul A. Libby
Publisher: CRC Press
ISBN: 9781560321002
Category : Technology & Engineering
Languages : en
Pages : 370
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Book Description
Beginning with a description of turbulence, its various manifestations, and a brief history of study, this text also incorporates modern perspectives on turbulence. The text also covers such topics as intermittency and the resultant conditional sampling and averaging of turbulent flows, the role of large scale computation of the fundamental equations of fluid mechanics in providing information on variables, and asymptotic methods which are used to expose important features of turbulent flows. Meaningful exercises are included in every section.
Author: Franz Durst
Publisher: Springer Science & Business Media
ISBN: 3642714358
Category : Science
Languages : en
Pages : 367
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Book Description
The first four symposia in the series on turbulent shear flows have been held alternately in the United States and Europe with the first and third being held at universities in eastern and western States, respectively. Continuing this pattern, the Fifth Symposium on Turbulent Shear Flows was held at Cornell University, Ithaca, New York, in August 1985. The meeting brought together more than 250 participants from around the world to present the results of new research on turbulent shear flows. It also provided a forum for lively discussions on the implications (practical or academic) of some of the papers. Nearly 100 formal papers and about 20 shorter communications in open forums were presented. In all the areas covered, the meeting helped to underline the vitality of current research into turbulent shear flows whether in experimental, theoretical or numerical studies. The present volume contains 25 of the original symposium presentations. All have been further reviewed and edited and several have been considerably extended since their first presentation. The editors believe that the selection provides papers of archival value that, at the same time, give a representative statement of current research in the four areas covered by this book: - Homogeneous and Simple Flows - Free Flows - Wall Flows - Reacting Flows Each of these sections begins with an introductory article by a distinguished worker in the field.
