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Book Thermoacoustic Combustion Instability Control

Download or read book Thermoacoustic Combustion Instability Control written by Dan Zhao and published by Academic Press. This book was released on 2023-02-13 with total page 1145 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermoacoustic Combustion Instability Control: Engineering Applications and Computer Codes provides a unique opportunity for researchers, students and engineers to access recent developments from technical, theoretical and engineering perspectives. The book is a compendium of the most recent advances in theoretical and computational modeling and the thermoacoustic instability phenomena associated with multi-dimensional computing methods and recent developments in signal-processing techniques. These include, but are not restricted to a real-time observer, proper orthogonal decomposition (POD), dynamic mode decomposition, Galerkin expansion, empirical mode decomposition, the Lattice Boltzmann method, and associated numerical and analytical approaches. The fundamental physics of thermoacoustic instability occurs in both macro- and micro-scale combustors. Practical methods for alleviating common problems are presented in the book with an analytical approach to arm readers with the tools they need to apply in their own industrial or research setting. Readers will benefit from practicing the worked examples and the training provided on computer coding for combustion technology to achieve useful results and simulations that advance their knowledge and research. - Focuses on applications of theoretical and numerical modes with computer codes relevant to combustion technology - Includes the most recent modeling and analytical developments motivated by empirical experimental observations in a highly visual way - Provides self-contained chapters that include a comprehensive, introductory section that ensures any readers new to this topic are equipped with required technical terms

Book Numerical Study on Catalytic Combustion and Extinction Characteristics of Pre mixed Methane air in Micro Flatbed Channel Under Different Parameters of Operation and Wall

Download or read book Numerical Study on Catalytic Combustion and Extinction Characteristics of Pre mixed Methane air in Micro Flatbed Channel Under Different Parameters of Operation and Wall written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Numerical Investigation of Wall Heat Conduction Effects in Catalytic Combustion Systems

Download or read book Numerical Investigation of Wall Heat Conduction Effects in Catalytic Combustion Systems written by Michael Grimm and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Catalytic converters are used in a variety of applications ranging from low-temperature combustion for gas turbine applications to the removal of pollutants from engine exhaust flow. Catalytic converters currently used in industry consist of a ceramic monolithic plug. This monolithic plug has a honeycomb-like structure, and is comprised of many small cylindrical channels (tubes), the inner surfaces of which are covered with a reactive catalyst. Determining the effect of the thermal conductivity of the monolith ceramic material on the ignition, flame stability, and steady state combustion will provide a scientific foundation with regard to the selection of materials for the construction of catalytic monoliths. This effect is investigated in this study through numerical simulations. Two commonly used materials are compared: cordierite, a ceramic with a low thermal conductivity, and silicon carbide, a ceramic with a high thermal conductivity. Another issue that is critical to the design of a catalytic converter is the length of the monolith plug. The optimum length of a monolith tube is one that completely converts the incoming flow while utilizing the entire length of the catalytic coating. In practice, the length is adjusted by stacking monolith plugs end-to-end, though it is unclear how different the end-to-end plugs are when compared to a single continuous tube of the same length. This study numerically investigates the effects of this practice, with the goal to determine if a tube of length 2L exhibits the same behavior as two identical tube sections placed end-to-end, each of length L. The commercial CFD software CFD-ACE+TM was utilized to investigate the afore-stated issues. The inlet flow rates of the methane-air mixture and the fuel equivalence ratio (or fuel-air ratio) were treated as parameters. Only lean and stoichiometric mixtures were considered because in practice catalytic combustion is not performed with rich mixtures. Catalytic combustion of a methane-air mixture on a platinum catalyst was used as the candidate system because the chemistry of this system is well documented. The models were set up and tested in an order of increasing complexity to ensure steady progress in the research. Beginning with simple flow and heat transfer, the model was extended to include a single step combustion reaction, and finally a detailed reaction mechanism consisting of 24 surface reactions between 19 species. Both steady-state and transient simulations were conducted. The results show that thermal conductivity of the ceramic monolith has a large effect on ignition, flame stability, and steady state combustion. The ceramic material with a high thermal conductivity value, namely silicon carbide, produces a stable flame over a much wider range of inlet flow rates than the ceramic material with a low thermal conductivity value, namely cordierite. Over their respective ranges of ignition, for both silicon carbide and cordierite, the maximum temperature of the monolith tube is more or less the same, indicating that there is no effect of thermal conductivity on the maximum temperature. Therefore, a case can be made for using silicon carbide instead of cordierite to create catalytic monoliths capable of handling a wider variety of inlet flow rates. The results also show that the ignition and blowout limits vary significantly between split and continuous tubes at high inlet flow speeds when the monolith tube walls are constructed from materials with high thermal conductivity; in this case, silicon carbide. For high inlet flow speeds there are significant differences between split and continuous tubes for the high thermal conductivity material. For monolith tubes constructed from materials with low thermal conductivity, such as the case of cordierite, there are no significant differences between split and continuous tubes over the entire flammability range. Additionally, for high thermal conductivity materials with low inlet flow speeds and low thermal conductivity materials for all inlet flow speeds over the range of ignition, the fuel conversion percentage does not significantly change and therefore, appears to be independent of inlet flow speed. These results imply that axial heat conduction, or lack thereof due to thermal contact resistance from an air-gap between the end-to-end monolith plugs, through the walls of the monolith results in thermal non-equilibrium between the solid and fluid phase, and subsequently affects ignition and flame stability in catalytic combustion.

Book Methane Combustion over Lanthanum based Perovskite Mixed Oxides

Download or read book Methane Combustion over Lanthanum based Perovskite Mixed Oxides written by Hamidreza Arandiyan and published by Springer. This book was released on 2016-10-29 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents current research into the catalytic combustion of methane using perovskite-type oxides (ABO3). Catalytic combustion has been developed as a method of promoting efficient combustion with minimum pollutant formation as compared to conventional catalytic combustion. Recent theoretical and experimental studies have recommended that noble metals supported on (ABO3) with well-ordered porous networks show promising redox properties. Three-dimensionally ordered macroporous (3DOM) materials with interpenetrated and regular mesoporous systems have recently triggered enormous research activity due to their high surface areas, large pore volumes, uniform pore sizes, low cost, environmental benignity, and good chemical stability. These are all highly relevant in terms of the utilization of natural gas in light of recent catalytic innovations and technological advances. The book is of interest to all researchers active in utilization of natural gas with novel catalysts. The research covered comes from the most important industries and research centers in the field. The book serves not only as a text for researcher into catalytic combustion of methane, 3DOM perovskite mixed oxide, but also explores the field of green technologies by experts in academia and industry. This book will appeal to those interested in research on the environmental impact of combustion, materials and catalysis.

Book Elementary Process in the Catalytic Combustion of Methane

Download or read book Elementary Process in the Catalytic Combustion of Methane written by Gas Research Institute and published by . This book was released on 1986 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Catalytic Methane Combustion in Microreactors

Download or read book Catalytic Methane Combustion in Microreactors written by Li He and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book An Investigation Into the Catalytic Combustion of Methane for Natural Gas Vehicles

Download or read book An Investigation Into the Catalytic Combustion of Methane for Natural Gas Vehicles written by David John Crittle and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Catalytic Combustion of Methane and Oxygen for Micropropulsion Applications

Download or read book Catalytic Combustion of Methane and Oxygen for Micropropulsion Applications written by Scott Jeffrey Volchko and published by . This book was released on 2005 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Development of a Catalytic Combustion System for the MIT Micro Gas Turbine Engine

Download or read book Development of a Catalytic Combustion System for the MIT Micro Gas Turbine Engine written by Jhongwoo Peck and published by . This book was released on 2003 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of the MIT micro-gas turbine engine project, the development of a hydrocarbon-fueled catalytic micro-combustion system is presented. A conventionally-machined catalytic flow reactor was built to simulate the micro-combustor and to better understand the catalytic combustion at micro-scale. In the conventionally-machined catalytic flow reactor, catalytic propane/air combustion was achieved over platinum. A 3-D finite element heat transfer model was also developed to assess the heat transfer characteristics of the catalytic micro-combustor. It has been concluded that catalytic combustion in the micro-combustor is limited by diffusion of fuel into the catalyst surface. To address this issue, a catalytic structure with larger surface area was suggested and tested. It was shown that the larger surface area catalyst increased the chemical efficiency. Design guidelines for the next generation catalytic micro-combustor are presented as well.

Book Investigation of Heterogeneous Surface Chemistry for the Catalytic Combustion of Methane and Syngas

Download or read book Investigation of Heterogeneous Surface Chemistry for the Catalytic Combustion of Methane and Syngas written by Cary Asher Henry and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: In recent years, catalytic combustion has been intensely researched for its ability to reduce NO[subscript x] emissions and the release of unburned hydrocarbons. One major point of interest is the use of catalytic reactors along with homogeneous combustors to create a hybrid combustor for power generation cycles. By using catalysis along with traditional homogeneous combustion, the same amount of energy can be released from hydrocarbon fuels at a temperature lower than the adiabatic flame temperature, which results in a reduction in the produced NO[subscript x] emissions. While studies on the activity of fuel lean catalytic reactors are well published, there have been few investigations for the fuel rich catalytic reactors. Another aspect of catalytic combustion which has little published research is the study of heat transfer effects initiated by a catalytically active surface. The focus of this research is to study and model the chemical kinetics for the fuel rich catalytic combustion of methane, hydrogen, and syngas as well as to investigate the effect of a catalytically active surface on the convective heat transfer coefficient of the catalyst surface.

Book Catalytic Combustion of Methane hydrogen oxygen Mixtures in a Platinum Microtube for Micropropulsion Applications

Download or read book Catalytic Combustion of Methane hydrogen oxygen Mixtures in a Platinum Microtube for Micropropulsion Applications written by Christopher Arnold Mento and published by . This book was released on 2007 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: