Experimental And Numerical Investigations Of Flames Stabilized By Swirl Flow And Bluff Body
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Experimental And Numerical Investigations Of Flames Stabilized By Swirl Flow And Bluff Body
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Author : Yiheng Tong
language : en
Publisher:
Release Date : 2017
Experimental And Numerical Investigations Of Flames Stabilized By Swirl Flow And Bluff Body written by Yiheng Tong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Experimental And Numerical Investigations In Materials Science And Engineering
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Author : Nenad Mitrovic
language : en
Publisher: Springer
Release Date : 2018-09-03
Experimental And Numerical Investigations In Materials Science And Engineering written by Nenad Mitrovic and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-09-03 with Technology & Engineering categories.
This book provides a collection of high-quality peer-reviewed research papers presented at the International Conference of Experimental and Numerical Investigations and New Technologies (CNNTech2018), held in Zlatibor, Serbia from 4 to 6 July 2018. The book discusses a wide variety of industrial, engineering and scientific applications of engineering techniques. Researchers from academia and the industry share their original work and exchange ideas, experiences, information, techniques, applications and innovations in the field of mechanical engineering, materials science, chemical and process engineering, experimental techniques, numerical methods and new technologies.
Experimental And Numerical Investigation Of The Influence Of Multiple Burner Arrangements On Combustion Instabilities In Turbulent Swirl Stabilized Flames
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Author : Christian Kraus
language : en
Publisher:
Release Date : 2014
Experimental And Numerical Investigation Of The Influence Of Multiple Burner Arrangements On Combustion Instabilities In Turbulent Swirl Stabilized Flames written by Christian Kraus and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
A Detailed Investigation Of Bluff Body Stabilized Flames Postprint
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Author :
language : en
Publisher:
Release Date : 2007
A Detailed Investigation Of Bluff Body Stabilized Flames Postprint written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Reduced Order Models (ROMs) and Computational Fluid Dynamics (CFD) codes are tools used to predict the extinction of flames behind bluff bodies. Accurate prediction of these models and codes is predicated on their validation with experimental data. This paper describes detailed experiments to obtain validation data for bluff body stabilized flames over a wide range of conditions. Included are non-reacting data from CFD and LDV, lean blowout and high speed images for three different flame holders. In our previous paper (Kiel 2006) it was asserted that the large vortices were a major driver of extinction. Those assertions are further supported here. It is concluded that the vortex dynamics and not geometry is the dominant mechanism for bluff body flame extinction. This conclusion is supported by the lean blowout data, by the high speed images and reference data from NACA.
Direct Numerical Simulation Of Bluff Body Stabilized Flames
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Author : Farzin Jalilalghadr
language : en
Publisher:
Release Date : 2007
Direct Numerical Simulation Of Bluff Body Stabilized Flames written by Farzin Jalilalghadr and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Direct numerical simulation (DNS) is used to study reacting and non-reacting bluff-body stabilized flows. Three fuel-to-air velocity ratios were considered. The results show that three types of flow fields can be identified. For the fuel-to-air velocity ratio of 0:84, the flow field is dominated by the reverse flow of the coflowing air. The jet does not penetrate through the reverse flow, and two stagnation points are formed on the centerline, where the jet and air stagnate. The downstream flow field is similar to a wake flow, and therefore this flow is referred to as a bluff-body dominant flow. For the fuel-to-air velocity ratio of 1:4, the flow field is neither dominated by the jet nor the coflowing air and is referred to as an intermittent flow. For the fuel-to-air velocity ratio of 2:8, the jet penetrates through the reverse flow and no stagnation point is formed. The flow field is similar to that of a pure jet, therefore this flow is referred to as a jet dominant flow. In all cases, the coflowing air converges towards the centerline and forms a recirculation zone that extends to approximately one bluff-body diameter downstream. For the reacting flow, the methane combustion is modeled via a global, 1-step kinetic mechanism. The main effects of combustion on the flow field are an increase in the length of the recirculation zone, and a decrease in the velocity fluctuations. Based on the three velocity ratios, three types of flames are produced. For the velocity ratio of 0:84, a short mushroom shaped flame is produced near the fuel stagnation point. For the velocity ratio of 1:4, a medium length flame is produced in the shear layer region between the fuel and air. The flame is anchored in the recirculation zone, and extends downstream of the bluff-body. For the velocity ratio of 2:8, a long flame is produced near the centerline and is also anchored in the recirculation zone. All three flames are stabilized between the coflowing air and the jet, where the strain-rates are low, and the mixture fraction is near the stoichiometric value for methane combustion.
Experimental Investigation Of The Dynamics And Blowoff Characteristics Of Bluff Body Stabilized 2d V Shaped Turbulent Premixed Flames With Different Gaseous Hydrocarbon Fuels
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Author : Rishi Roy
language : en
Publisher:
Release Date : 2018
Experimental Investigation Of The Dynamics And Blowoff Characteristics Of Bluff Body Stabilized 2d V Shaped Turbulent Premixed Flames With Different Gaseous Hydrocarbon Fuels written by Rishi Roy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Electronic dissertations categories.
Coarse Grained Simulation And Turbulent Mixing
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Author : Fenando F. Grinstein
language : en
Publisher: Cambridge University Press
Release Date : 2016-06-30
Coarse Grained Simulation And Turbulent Mixing written by Fenando F. Grinstein and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-06-30 with Science categories.
Reviews our current understanding of the subject. For graduate students and researchers in computational fluid dynamics and turbulence.
Stabilization And Dynamic Of Premixed Swirling Flames
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Author : Paul Palies
language : en
Publisher: Academic Press
Release Date : 2020-07-03
Stabilization And Dynamic Of Premixed Swirling Flames written by Paul Palies and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-07-03 with Technology & Engineering categories.
Stabilization and Dynamic of Premixed Swirling Flames: Prevaporized, Stratified, Partially, and Fully Premixed Regimes focuses on swirling flames in various premixed modes (stratified, partially, fully, prevaporized) for the combustor, and development and design of current and future swirl-stabilized combustion systems. This includes predicting capabilities, modeling of turbulent combustion, liquid fuel modeling, and a complete overview of stabilization of these flames in aeroengines. The book also discusses the effects of the operating envelope on upstream fresh gases and the subsequent impact of flame speed, combustion, and mixing, the theoretical framework for flame stabilization, and fully lean premixed injector design. Specific attention is paid to ground gas turbine applications, and a comprehensive review of stabilization mechanisms for premixed, partially-premixed, and stratified premixed flames. The last chapter covers the design of a fully premixed injector for future jet engine applications. Features a complete view of the challenges at the intersection of swirling flame combustors, their requirements, and the physics of fluids at work Addresses the challenges of turbulent combustion modeling with numerical simulations Includes the presentation of the very latest numerical results and analyses of flashback, lean blowout, and combustion instabilities Covers the design of a fully premixed injector for future jet engine applications
Swirling Flows And Flames
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Author : Toufik Boushaki
language : en
Publisher: BoD – Books on Demand
Release Date : 2019-06-26
Swirling Flows And Flames written by Toufik Boushaki and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-06-26 with Science categories.
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.
Unsteady Combustor Physics
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Author : Tim C. Lieuwen
language : en
Publisher: Cambridge University Press
Release Date : 2012-08-27
Unsteady Combustor Physics written by Tim C. Lieuwen and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-08-27 with Technology & Engineering categories.
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.