Modeling Macro And Micro Scale Turbulent Mixing And Chemistry In Engine Exhaust Plumes
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Atmospheric Effects Of Aviation
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Author : Anne M. Thompson
language : en
Publisher:
Release Date : 1996
Atmospheric Effects Of Aviation written by Anne M. Thompson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Aerosols categories.
Nasa University Program Management Information System Fy 1995
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Author :
language : en
Publisher:
Release Date : 1995
Nasa University Program Management Information System Fy 1995 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.
Modeling The Evolution Of Vehicle Exhaust Plume Near Road And In Laboratory Dilution Systems Using The Ctag Model
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Author : Yan Wang
language : en
Publisher:
Release Date : 2013
Modeling The Evolution Of Vehicle Exhaust Plume Near Road And In Laboratory Dilution Systems Using The Ctag Model written by Yan Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
There are a growing number of people living or spending substantial time near major roadways, being exposed to elevated traffic-related pollutants. Due to their adverse health effect, it is imperative to reduce the uncertainties in the traffic emission inventory and characterize the spatial and temporal impacts of pollutants on near-road air quality, which is critical to assessing human exposure. This dissertation presents the development and applications of an environmental turbulent reacting flow model, the Comprehensive Turbulent Aerosol Dynamics and Gas Chemistry (CTAG) model. CTAG is designed to simulate the transport and transformation of multiple air pollutants in various environments. For near-road applications, CTAG couples the major turbulent mixing processes with gas-phase chemistry and aerosol dynamics. CTAG demonstrates that significant improvement in predicting the spatial gradients of pollutants near roadways can be achieved by detailed treatment of turbulence characteristics. It is commonly assumed that the NO2/NOx ratio by volume for most roadways is 5%. However, this dissertation is the first to show that this assumption may not be suitable for most roadways, especially those with a high fraction of heavy-duty truck traffic. It also illustrates that the dynamics of exhaust plumes are highly sensitive to vehicle-induced turbulence, sulfuric acid induced nucleation, and condensation of organic compounds. It simulates, for the first time, the multi-scale aerosol dynamics and microenvironmental air quality by introducing a multi-scale structure to generate the processed on-road particle emissions. It implies that roadway and surrounding infrastructure designs can affect near-road air quality. CTAG can be used to improve the regulatory model in assessing the air quality in near-road environments. The turbulent reacting flows inside the fabricated dilution systems are also investigated since they are essential to most emission testing procedures and share the same mechanisms with the atmospheric dilution. CTAG investigates the effects of the dilution parameters and illustrates that turbulence plays a crucial role in mixing the exhaust with the dilution air, and the strength of nucleation dominates the level of particle emissions. A potential unifying parameter, the dilution rate of exhaust, is found to play an important role in new particle formation. Using the CTAG model, urban planners have the potential to develop strategies to reduce the uncertainties associated with dilution samplings and define a standardized dilution sampling methodology for characterizing emissions from multiple combustion sources.
29th Aiaa Fluid Dynamics Conference
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Author :
language : en
Publisher:
Release Date : 1998
29th Aiaa Fluid Dynamics Conference written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Fluid dynamics categories.
Nasa University Program Management Information System Fy 1994
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Author :
language : en
Publisher:
Release Date : 1994
Nasa University Program Management Information System Fy 1994 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Proceedings
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Author :
language : en
Publisher:
Release Date : 1995
Proceedings written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Mathematics categories.
1st Aiaa Aircraft Engineering Technology And Operations Congress
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Author :
language : en
Publisher:
Release Date : 1996
1st Aiaa Aircraft Engineering Technology And Operations Congress written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Aeronautics categories.
Turbulent Combustion Modeling
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Author : Tarek Echekki
language : en
Publisher: Springer Science & Business Media
Release Date : 2010-12-25
Turbulent Combustion Modeling written by Tarek Echekki and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-12-25 with Technology & Engineering categories.
Turbulent combustion sits at the interface of two important nonlinear, multiscale phenomena: chemistry and turbulence. Its study is extremely timely in view of the need to develop new combustion technologies in order to address challenges associated with climate change, energy source uncertainty, and air pollution. Despite the fact that modeling of turbulent combustion is a subject that has been researched for a number of years, its complexity implies that key issues are still eluding, and a theoretical description that is accurate enough to make turbulent combustion models rigorous and quantitative for industrial use is still lacking. In this book, prominent experts review most of the available approaches in modeling turbulent combustion, with particular focus on the exploding increase in computational resources that has allowed the simulation of increasingly detailed phenomena. The relevant algorithms are presented, the theoretical methods are explained, and various application examples are given. The book is intended for a relatively broad audience, including seasoned researchers and graduate students in engineering, applied mathematics and computational science, engine designers and computational fluid dynamics (CFD) practitioners, scientists at funding agencies, and anyone wishing to understand the state-of-the-art and the future directions of this scientifically challenging and practically important field.
41st Aiaa Aerospace Sciences Meeting Exhibit
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Author :
language : en
Publisher:
Release Date : 2003
41st Aiaa Aerospace Sciences Meeting Exhibit written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Aeronautics categories.
Modeling And Simulation Of Turbulent Combustion
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Author : Santanu De
language : en
Publisher: Springer
Release Date : 2017-12-12
Modeling And Simulation Of Turbulent Combustion written by Santanu De and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-12-12 with Science categories.
This book presents a comprehensive review of state-of-the-art models for turbulent combustion, with special emphasis on the theory, development and applications of combustion models in practical combustion systems. It simplifies the complex multi-scale and nonlinear interaction between chemistry and turbulence to allow a broader audience to understand the modeling and numerical simulations of turbulent combustion, which remains at the forefront of research due to its industrial relevance. Further, the book provides a holistic view by covering a diverse range of basic and advanced topics—from the fundamentals of turbulence–chemistry interactions, role of high-performance computing in combustion simulations, and optimization and reduction techniques for chemical kinetics, to state-of-the-art modeling strategies for turbulent premixed and nonpremixed combustion and their applications in engineering contexts.