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Author : Viacheslav Stetsyuk
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)
Download or read book Experimental Study of Combustion and Scalar Mixing in Swirling Jet Flows written by Viacheslav Stetsyuk and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ramis Örlü
Publisher :
ISBN 13 : 9789171783813
Total Pages : 111 pages
Book Rating : 4.7/5 (838 download)
Download or read book Experimental Study of Passive Scalar Mixing in Swirling Jet Flows written by Ramis Örlü and published by . This book was released on 2006 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Toufik Boushaki
Publisher : BoD – Books on Demand
ISBN 13 : 1838807438
Total Pages : 120 pages
Book Rating : 4.8/5 (388 download)
Download or read book Swirling Flows and Flames written by Toufik Boushaki and published by BoD – Books on Demand. This book was released on 2019-06-26 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Swirl flows are used in a wide range of industrial applications. In non-reacting cases, examples of applications include vortex amplifiers and reactors, heat exchangers, jet pumps, and cyclone separators. In reacting cases, swirlers are widely used in combustion systems, such as gas turbines, industrial furnaces, boilers, gasoline and diesel engines, and many other practical heating devices. Effects of using swirl on flow and combustion are significant and varied, and concern, for example, aerodynamics, mixing, flame stability, intensity of combustion, and pollutant emissions. The purpose of this book is to present recent research efforts to understand and characterize swirling flows of different types and in different applications. These include gaseous, liquid, and solid fuels in order to enhance combustion systems and their energy efficiency. Swirl flows are very complex and the studies proposed in this project are based on different means, including theoretical calculations, numerical modeling, and experimental measurements.
Author : Celestin P. Zemtsop
Publisher :
ISBN 13 : 9781303050381
Total Pages : 115 pages
Book Rating : 4.0/5 (53 download)
Download or read book Unified RANS/LES Simulations of Turbulent Swirling Jet Flows written by Celestin P. Zemtsop and published by . This book was released on 2011 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: Swirl flows are useful in many engineering and environmental applications. They can be utilized to reduce emissions of pollutants, to improve ignition stability, and to stabilize a flame for clean combustion. The majority of swirl flows include both wall-bounded regions and free shear flow regions. Experimental research cannot provide all the information needed for the study of these flows. Numerical simulations of swirl flows provide more insights into the structure of the swirl flows. The direct numerical simulation (DNS) method is an accurate and reliable tool for flow simulations but computationally expensive. Reynolds-averaged Navier-Stokes (RANS) methods are computationally less expensive for the simulation of wall-bounded and free shear flows, but they turn out to be not well appropriate for turbulent swirling jet simulations. Large-eddy simulation (LES) is an appropriate modeling approach for turbulent swirl flow simulations, but the calculation of the free swirling jet using LES needs fluctuating inlet velocity conditions. The generation of such fluctuating velocity fields could be done by performing a LES of the nozzle flow. Unfortunately, the computational costs of such LES are comparable to those of DNS. A need thus arises to apply a hybrid RANS/LES method that combines two main advantages, the capability of LES methods in capturing instantaneous flow structures and the low computational costs of RANS methods. In this study, the performance of two hybrid approaches, a segregated RANS/LES method, and a unified RANS/LES method, is investigated regarding the simulation of turbulent swirling jet flows. The segregated model combines a RANS model in the nozzle region and a LES model in the jet region, whereas the unified model combines a RANS model in near-wall regions with a LES model away from the wall. This study provides evidence that the unified turbulence model is a better tool to predict swirl flows and, more importantly, a better tool to calculate the vortex breakdown. The accuracy of the numerical predictions is confirmed by comparing available experimental data for non-swirling and swirling jet flows with computational results. The validated model is used to study the mechanism of swirl effects, vortex breakdown, and scalar mixing.
Author : Fenando F. Grinstein
Publisher : Cambridge University Press
ISBN 13 : 1107137047
Total Pages : 481 pages
Book Rating : 4.1/5 (71 download)
Download or read book Coarse Grained Simulation and Turbulent Mixing written by Fenando F. Grinstein and published by Cambridge University Press. This book was released on 2016-06-30 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews our current understanding of the subject. For graduate students and researchers in computational fluid dynamics and turbulence.
Author : Vladimir Dulin
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (139 download)
Download or read book Coherent Structures in the Near Field of Swirling Turbulent Jets and Flames Investigated by PIV and PLIF written by Vladimir Dulin and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of the experimental study of coherent flow structures in turbulent jets with different swirl rates are reported. The focus is placed on analysis of their impact on mixing of a passive scalar in the jets and on regular flame front deformations during combustion of fuel-lean and fuel-rich methane/air mixtures in case of a strongly swirling jet with vortex breakdown. The measurements are performed by applying simultaneously the particle image velocimetry (PIV) and planar laser-induced fluorescence (PLIF) techniques (acetone and HCHO for the nonreacting and reacting flows, respectively). The PIV data are processed by a proper orthogonal decomposition (POD), and the PLIF data are conditionally sampled according to the correlation coefficients of the velocity POD modes. The coherent velocity fluctuations are associated with regular patterns in the concentration fluctuation fields and flame front deformations. These patterns correspond to unsteady mixing by large-scale vortex structures in the outer mixing layer and also to variations of the entrainment rate for the flows with swirl.
Author :
Publisher :
ISBN 13 :
Total Pages : 704 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (946 download)
Download or read book Turbulent Mixing Processes in a Swirling-Multiple Jet Confined Crossflow Configuration written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of the present work is to provide global insight on the turbulent mixing processes typically occurring in a rectangular perspex mixing module simulating a sector of an annular RQL gas turbine combustor, through an experimental investigation of non reacting multiple jet mixing with a confined swirling crossflow. The RQL (Rich burn - quick Quench - Lean burn) staged combustion concept has been proposed as one of the candidate technologies towards reducing NOx emissions in gas turbine combustion systems. Mean and fluctuating momentum and scalar field distributions, mixing rate and standard deviation were determined in a number of different test cases obtained by parametric variation of flow and geometric configuration conditions. The results clearly indicate the sensitivity of the attained mixing quality on the particular flow arrangement, the momentum flux ratio and the effect of swirl induced in the primary zone.
Author : Amin Akbari
Publisher :
ISBN 13 : 9781124381060
Total Pages : 167 pages
Book Rating : 4.3/5 (81 download)
Download or read book Numerical and Experimental Study of Mixing Properties of Gaseous Fuels Jets Including Hydrogen and Methane Into the Non-swirl Main Flow in a Premixer Configuration written by Amin Akbari and published by . This book was released on 2010 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mixing of fuel and air has a significant impact on overall operation efficiency and emissions performance of combustion systems, especially in lean combustion applications. As a result, developing an understanding of the processes associated with the fuel/air mixing is important. In parallel with the evolution of lean combustion, a new generation of fuels is emerging as an alternative to conventional fuels. Thus, it is desirable to study the mixing properties of different fuels from conventional resources, such as methane, as well as from renewable resources, such as hydrogen. One tool that is available to study mixing in complex (e.g., turbulent and elliptic) flows is computational fluid dynamics (CFD). In the present work, mixing of hydrogen and methane into air, for example, is simulated using various CFD approaches. Fuel is injected either co-flowing to the air flow ("axial injection") or perpendicular to the air flow ("radial injection"). The quality of the simulations is evaluated by comparing the numerical results with experimental measurements. Qualitative and quantitative comparisons are used to evaluate the relative accuracy of different CFD approaches to simulate the mixing characteristics. Reynolds Averaged Navier-Stokes (RANS) turbulent models are utilized to model all the cases as steady turbulent models. Moreover, unsteady turbulent models, such as Unsteady RANS, and Large Eddy Simulation (LES) are used to provide information about unsteady features in selected cases. The sensitivity of numerical predictions to different RANS turbulence models as well as to different turbulent Schmidt numbers are explored. The results indicate more sensitivity to turbulence models for radial injection configurations. However, for the axial configuration, more sensitivity to Sct is observed. In general, the RSM turbulence model with Sct=0.7 provides the most promising predictions for various combination of different fuels and injection types.
Author : Tim C. Lieuwen
Publisher : Cambridge University Press
ISBN 13 : 1139576836
Total Pages : 427 pages
Book Rating : 4.1/5 (395 download)
Download or read book Unsteady Combustor Physics written by Tim C. Lieuwen and published by Cambridge University Press. This book was released on 2012-08-27 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developing clean, sustainable energy systems is a pre-eminent issue of our time. Most projections indicate that combustion-based energy conversion systems will continue to be the predominant approach for the majority of our energy usage. Unsteady combustor issues present the key challenge associated with the development of clean, high-efficiency combustion systems such as those used for power generation, heating or propulsion applications. This comprehensive study is unique, treating the subject in a systematic manner. Although this book focuses on unsteady combusting flows, it places particular emphasis on the system dynamics that occur at the intersection of the combustion, fluid mechanics and acoustic disciplines. Individuals with a background in fluid mechanics and combustion will find this book to be an incomparable study that synthesises these fields into a coherent understanding of the intrinsically unsteady processes in combustors.
Author :
Publisher :
ISBN 13 :
Total Pages : 296 pages
Book Rating : 4.:/5 (317 download)
Download or read book An Experimental Study of Swirling Flows as Applied to Annular Combustors written by and published by . This book was released on 1997 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jonathan Wayne Naughton
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.3/5 (91 download)
Download or read book Integrated Computational/experimental Study of Turbulence Modification and Mixing Enhancement in Swirling Jets written by Jonathan Wayne Naughton and published by . This book was released on 2009 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Swirling jet flows have been studied experimentally and computationally and the results have been compared with theory. Three-component Laser Doppler Anemometry (LDA) measurements have been carried out for swirling jets of various strengths and swirl distributions. Radial profiles of velocity have been obtained from the jet exit to 50 diameters downstream. The experimental results are consistent with previous results and with similarity theory for weakly swirling turbulent jets. However, the parametric range and spatial domain of the current data set makes it suitable for validation. Computational simulations have also been performed using a combination of Reynolds Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES) approaches. The results have been validated with experimental data and used to explore the mechanisms behind the increased mixing enhancement observed. The combined experimental/computational effort is still ongoing, but the experiences to date have demonstrated the effectiveness of such an approach.
Author : Andrew Pollard
Publisher : Springer Science & Business Media
ISBN 13 : 9401719985
Total Pages : 454 pages
Book Rating : 4.4/5 (17 download)
Download or read book IUTAM Symposium on Turbulent Mixing and Combustion written by Andrew Pollard and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goals of the Symposium were to draw together researchers in turbulence and combustion so as to highlight advances and challenge the boundaries to our understanding of turbulent mixing and combus tion from both experimental and simulation perspectives; to facilitate cross-fertilization between leaders in these two fields. These goals were noted to be important given that turbulence itself is viewed as the last great problem in classical physics and the addition of chemical reaction amplifies the difficulties enormously. The papers that have been included here reflect the richness of our subject. Turbulence is rich and complex in its own right. And, its inner structure, hidden in the morass of scales, large and small, can dominate transport. Earlier IUTAM Symposia have considered this field, Eddy Structure Identification in Free Turbulent Flows, Bonnet and Glauser (eds) 1992 and Simulation and Identification of Organized Structures in Flows, Sorensen, Hopfinger and Aubry (eds) 1997. The combustion community is well served by its specialized events, most notable is the bi annual International Combustion Symposium, held under the auspices of the Combustion Institute. Mixing is often considered somewhere in between these two. This broad landscape was addressed in this Sym posium in a somewhat temporal linear fashion of increasing complexity. The lectures considered the many challenges posed by adding one ele ment to the base formed by others: turbulence and turbulent mixing in the absence of combustion through to turbulent mixing dominated by chemistry and combustion.
Author : John Buckmaster
Publisher : Springer Science & Business Media
ISBN 13 : 9401110506
Total Pages : 639 pages
Book Rating : 4.4/5 (11 download)
Download or read book Combustion in High-Speed Flows written by John Buckmaster and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 639 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Author : D. R. Ballal
Publisher :
ISBN 13 :
Total Pages : 69 pages
Book Rating : 4.:/5 (227 download)
Download or read book Dynamic Combustion Studies Using Advanced Optical Diagnostics written by D. R. Ballal and published by . This book was released on 1988 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computer models of turbulent mixing and combustion suffer from many limitations, deficiencies, and errors. To evaluate and refine them, an experimental research program was started (a) to develop a combustion test facility and optical diagnostics, (b) to perform turbulent mixing and combustion experiments, and (c) to provide a data base for modeling needs. In Volume II, bench-mark quality data recorded in these experiments are documented for modeling needs. Specifically, data are tabulated for three variable-density, non-reactive turbulent mixing experiments: (1) 2-D Mixing Layer, (2) 2-D Slot Jet/Centerbody, and (3) Round Jet, and for two turbulent combustion experiments: (1) Scalar Fluctuations in Premixed Flames, (2) Conical Flame Stabilizer. These data may be used to evaluate and refine modeling codes of turbulent mixing and combustion processes. Keywords: Turbulent combustion, Jet flows, Recirculatory combustion, Nonreacting flows, Bluff-body, Near wake, Experimental data, Tables data. (aw).
Author : Wesley Martin Rohrer
Publisher :
ISBN 13 :
Total Pages : 188 pages
Book Rating : 4.:/5 (33 download)
Download or read book An Experimental Study of Ignition and Combustion in a Jet Mixing Zone written by Wesley Martin Rohrer and published by . This book was released on 1961 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ashwani K. Gupta
Publisher : Routledge
ISBN 13 :
Total Pages : 496 pages
Book Rating : 4.3/5 (91 download)
Download or read book Swirl Flows written by Ashwani K. Gupta and published by Routledge. This book was released on 1984 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
