Download or read book Investigation of the Effects of Preheating on the Characteristics of Micro Combustion written by Zerrin Turkeli-Ramadan and published by . This book was released on 2015 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: The requirement for efficient power sources for portable electronics and miniature mechanical devices, such as laptops, micro robots or micro aerial vehicles, has led to research on ultra micro gas turbine (UMGT). The ultra micro gas turbine is one of the most promising power sources for small scale applications due to its higher power and energy densities compared to currently used batteries. In order to realise UMGT as a viable power source, its individual components have to be developed, since downscaling introduces new problems for each component. Since the micro combustor is one of the key components of UMGT, it is an obvious area for investigation and improvement. Until now, it has been very difficult for micro combustors to achieve wide flame stability, high combustion efficiency and clean combustion with low pressure loss, due to the associated downscaling problems, such as high heat loss ratio and small residence time. In order to overcome the issues associated with smaller residence time, preheating the reactants was investigated in the present study, both experimentally and numerically. Two different domains were used in the two different methods. The effects of preheating the reactants on the flame stability and combustion characteristics were investigated experimentally on a 46 mm inner diameter quartz-walled flat flame combustor. The preheating was provided with external heaters. The flame shape and behaviour were observed with different air mass flow rates and equivalence ratios. The experimental results showed that preheating widened the flame stability limit. From the experimental results a new correlation was developed between mass flow rate, reactant temperature, air to fuel ratio and the diameter of the micro combustor. With this correlation, it is possible to determine the minimum combustor diameter required for stable flat flame combustion. Also, in order to have a stable flat flame at higher mass flow rates, the correlation enables the calculation of the required reactants temperature, and is a major contribution to the design of micro combustors. Furthermore, it was found that with the flat flame combustor, very clean, that is, almost complete combustion was achieved with both natural gas and methane as fuels. In addition, different flame holder materials were investigated for their pressure loss characteristics and usability for UMGT applications. On the other hand, the effects of preheating on the flame stability and species concentrations were investigated numerically within a 2 mm diameter micro combustor tube, over two-dimensions. The simulations were performed with both adiabatic walls and nonadiabatic walls. At high incoming flow velocities, preheating was shown to widen the flame stability limit. On the other hand, there is no advantage in preheating for low incoming flow velocities or low mass flow rates. A comparison of employing different skeletal and detailed reaction mechanisms was made. Furthermore, in the non-adiabatic case the effect of heat loss through the outer wall via convection and radiation were investigated with different heat transfer coefficients. In conclusion, preheating widens the flame stability limit and provides flame sustainability even at very small scales. The information generated in this research will help the development of UMGT as a viable alternative to conventional power sources at small scale.
Download or read book A Study on the Effects of Air Preheat on the Combustion and Heat Transfer Characteristics of Bunsen Flames written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in IC Engines and Combustion Technology written by Ashwani K. Gupta and published by Springer Nature. This book was released on 2020-08-18 with total page 939 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises select peer-reviewed proceedings of the 26th National Conference on IC Engines and Combustion (NCICEC) 2019 which was organised by the Department of Mechanical Engineering, National Institute of Technology Kurukshetra under the aegis of The Combustion Institute-Indian Section (CIIS). The book covers latest research and developments in the areas of combustion and propulsion, exhaust emissions, gas turbines, hybrid vehicles, IC engines, and alternative fuels. The contents include theoretical and numerical tools applied to a wide range of combustion problems, and also discusses their applications. This book can be a good reference for engineers, educators and researchers working in the area of IC engines and combustion.
Download or read book Sixth International Microgravity Combustion Workshop written by and published by . This book was released on 2001 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Role of Exergy in Energy and the Environment written by Sandro Nižetić and published by Springer. This book was released on 2018-07-30 with total page 889 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to the analysis and applications of energy, exergy, and environmental issues in all sectors of the economy, including industrial processes, transportation, buildings, and services. Energy sources and technologies considered are hydrocarbons, wind and solar energy, fuel cells, as well as thermal and electrical storage. This book provides theoretical insights, along with state-of-the-art case studies and examples and will appeal to the academic community, but also to energy and environmental professionals and decision makers.
Download or read book Convective Heat Transfer in Porous Media written by Yasser Mahmoudi and published by CRC Press. This book was released on 2019-11-06 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focusing on heat transfer in porous media, this book covers recent advances in nano and macro’ scales. Apart from introducing heat flux bifurcation and splitting within porous media, it highlights two-phase flow, nanofluids, wicking, and convection in bi-disperse porous media. New methods in modeling heat and transport in porous media, such as pore-scale analysis and Lattice–Boltzmann methods, are introduced. The book covers related engineering applications, such as enhanced geothermal systems, porous burners, solar systems, transpiration cooling in aerospace, heat transfer enhancement and electronic cooling, drying and soil evaporation, foam heat exchangers, and polymer-electrolyte fuel cells.
Download or read book An Investigation of the Influence of Air Preheat on Canister type Combustion written by Lester Howard MacLeod and published by . This book was released on 1958 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Application of Liquid Biofuels to Internal Combustion Engines written by Soo-Young No and published by Springer Nature. This book was released on 2020-02-17 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive overview of the application of liquid biofuels to internal combustion (IC) engines. Biofuels are one of the most promising renewable and sustainable energy sources. Particularly, liquid biofuels obtained from biomass could become a valid alternative to the use of fossil fuels in the light of increasingly stringent environmental constraints. In this book, the discussion is limited to liquid biofuels obtained from triglycerides and lignocellulose among the many different kinds of biomass. Several liquid biofuels from triglycerides, straight vegetable oil, biodiesel produced from inedible vegetable oil, hydrotreated vegetable oil, and pyrolytic oil have been selected for discussion, as well as biofuels from lignocellulose bio-oil, alcohols such as methanol, ethanol and butanol, and biomass-to-liquids diesel. This book includes three chapters on the application of methanol, ethanol and butanol to advanced compression ignition (CI) engines such as LTC, HCCI, RCCI and DF modes. Further, the application of other higher alcohols and other drop-in fuels such as DMF, MF, MTHF, and GVL are also discussed. The book will be a valuable resource for graduate students, researchers and engine designers who are interested in the application of alcohols and other biofuels in advanced CI engines, and also useful for alternative energy planners selecting biofuels for CI engines in the future.
Download or read book Chemical Engineering Research Trends written by Leon P. Berton and published by Nova Publishers. This book was released on 2007 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical engineering deals with the application of physical science (in particular chemistry and physics) and mathematics to the process of converting raw materials or chemicals into more useful or valuable forms. As well as producing useful materials, chemical engineering is also concerned with pioneering valuable new materials and techniques; an important form of research and development with direct applications in pharmaceuticals, semiconductors, artificial kidneys, oil refineries, solar panels, clean water, and biocompatible polymers! This book presents important research in this explosive field.
Download or read book High Temperature Air Combustion written by Hiroshi Tsuji and published by CRC Press. This book was released on 2002-12-03 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maximize efficiency and minimize pollution: the breakthrough technology of high temperature air combustion (HiTAC) holds the potential to overcome the limitations of conventional combustion and allow engineers to finally meet this long-standing imperative. Research has shown that HiTAC technology can provide simultaneous reduction of CO2 and nitric
Download or read book Advanced Combustion Technologies for Low Carbon Emissions written by Jun Li and published by Frontiers Media SA. This book was released on 2023-07-10 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Combustion Theory written by Forman A. Williams and published by CRC Press. This book was released on 2018-03-05 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combustion Theory delves deeper into the science of combustion than most other texts and gives insight into combustions from a molecular and a continuum point of view. The book presents derivations of the basic equations of combustion theory and contains appendices on the background of subjects of thermodynamics, chemical kinetics, fluid dynamics, and transport processes. Diffusion flames, reactions in flows with negligible transport and the theory of pre-mixed flames are treated, as are detonation phenomena, the combustion of solid propellents, and ignition, extinction, and flamibility pehnomena.
Download or read book Nano and Micro Scale Energetic Materials written by Weiqiang Pang and published by John Wiley & Sons. This book was released on 2023-01-26 with total page 1005 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an up-to-date account of innovative energetic materials and their potential applications in space propulsion and high explosives Most explosives and propellants currently use a small number of ingredients, such as TNT and nitrocellulose. In comparison to conventional materials, nano- and micro-scale energetic materials exhibit superior burning characteristics and much higher energy densities and explosive yields. Nano and Micro-scale Energetic Materials: Propellants and Explosives provides a timely overview of innovative nano-scale energetic materials (nEMs) and microscale energetic materials (μEMs) technology. Covering nEMs and μEMs ingredients as well as formulations, this comprehensive volume examines the preparation, characterization, ignition, combustion, and performance of energetic materials in various applications of propellants and explosives. Twenty-two chapters explore metal-based pyrotechnic nanocomposites, solid and hybrid rocket propulsion, solid fuels for in-space and power, the sensitivity and mechanical properties of explosives, new energetic materials, and more. Explores novel energetic materials and their potential for use in propellants and explosives Summarizes the most recent advances of leading research groups currently active in twelve countries Discusses how new environmentally friendly, high-combustion energetic materials can best be used in different applications Explains the fundamentals of energetic materials, including similarities and differences between composite propellants and explosives Nano and Micro-scale Energetic Materials: Propellants and Explosives is an important resource for materials scientists, explosives specialists, pyrotechnicians, environmental chemists, polymer chemists, physical chemists, aerospace physicians, and aerospace engineers working in both academia and industry.
Download or read book Journal of Research of the National Bureau of Standards written by United States. National Bureau of Standards and published by . This book was released on 1977 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microscale Combustion and Power Generation written by Christopher Cadou and published by Momentum Press. This book was released on 2014-12-26 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advances in microfabrication technologies have enabled the development of entirely new classes of small-scale devices with applications in fields ranging from biomedicine, to wireless communication and computing, to reconnaissance, and to augmentation of human function. In many cases, however, what these devices can actually accomplish is limited by the low energy density of their energy storage and conversion systems. This breakthrough book brings together in one place the information necessary to develop the high energy density combustion-based power sources that will enable many of these devices to realize their full potential. Engineers and scientists working in energy-related fields will find: • An overview of the fundamental physics and phenomena of microscale combustion; • Presentations of the latest modeling and simulation techniques for gasphase and catalytic micro-reactors; • The latest results from experiments in small-scale liquid film, microtube, and porous combustors, micro-thrusters, and micro heat engines; • An assessment of the additional research necessary to develop compact and high energy density energy conversion systems that are truly practical.
Download or read book Cleaner Combustion and Sustainable World written by Haiying Qi and published by Springer Science & Business Media. This book was released on 2012-11-19 with total page 1306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cleaner Combustion and Sustainable World is the proceedings of the 7th International Symposium on Coal Combustion which has a significant international influence. It concerns basic research on coal combustion and clean utilization, techniques and equipments of pulverized coal combustion, techniques and equipments of fluidized bed combustion, basic research and techniques of emission control, basic research and application techniques of carbon capture and storage (CCS), etc. Professor Haiying Qi and Bo Zhao both work at the Tsinghua University, China
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.
