Mixing and Combustion Processes in Air Breathing Propulsion Systems PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Mixing and Combustion Processes in Air Breathing Propulsion Systems PDF full book. Access full book title Mixing and Combustion Processes in Air Breathing Propulsion Systems by L. Douglas Smoot. Download full books in PDF and EPUB format.
Author: L. Douglas Smoot
Publisher:
ISBN:
Category :
Languages : en
Pages : 165
Get Book Here
Book Description
The general objectives of this study were to provide predictive techniques for air-breathing, particle-laden combustors and experimental data on rates of combustion and/or mixing of particle-laden jets. Jet mixing model predictions were compared with experiments reported in the literature. This led to the development of a turbulent mixing coefficient that improved predictions for systems with nonzero secondary velocity and gave reasonable predictions for reacting jets. The mixing model was extended to include boron particle nonequilibrium effects. Several predictions with this uncoupled model are also shown. A fully coupled turbulent jet mixing model was developed for a nonreacting, particle-gas system. Tests were made using a laboratory air-augmented combustor and a boron-loaded fuel. Mixing rates of particles and of gases were measured, as was extent of combustion of the boron particles. Tests were made using a new jet test facility for measuring mixing rates of particle-laden, nonreacting jets. Mixing rates of particles and gases were separately measured. Particle size, jet density and air velocity were systematically varied. (Modified author abstract).
Author: L. Douglas Smoot
Publisher:
ISBN:
Category :
Languages : en
Pages : 165
Get Book Here
Book Description
The general objectives of this study were to provide predictive techniques for air-breathing, particle-laden combustors and experimental data on rates of combustion and/or mixing of particle-laden jets. Jet mixing model predictions were compared with experiments reported in the literature. This led to the development of a turbulent mixing coefficient that improved predictions for systems with nonzero secondary velocity and gave reasonable predictions for reacting jets. The mixing model was extended to include boron particle nonequilibrium effects. Several predictions with this uncoupled model are also shown. A fully coupled turbulent jet mixing model was developed for a nonreacting, particle-gas system. Tests were made using a laboratory air-augmented combustor and a boron-loaded fuel. Mixing rates of particles and of gases were measured, as was extent of combustion of the boron particles. Tests were made using a new jet test facility for measuring mixing rates of particle-laden, nonreacting jets. Mixing rates of particles and gases were separately measured. Particle size, jet density and air velocity were systematically varied. (Modified author abstract).
Author: Gabriel Roy
Publisher: Butterworth-Heinemann
ISBN: 0123693942
Category : Business & Economics
Languages : en
Pages : 505
Get Book Here
Book Description
Chemical propulsion comprises the science and technology of using chemical reactions of any kind to create thrust and thereby propel a vehicle or object to a desired acceleration and speed. Cumbustion Processes in Propulsion focuses on recent advances in the design of very highly efficient, low-pollution-emitting propulsion systems, as well as advances in testing, diagnostics and analysis. It offers unique coverage of Pulse Detonation Engines, which add tremendous power to jet thrust by combining high pressure with ignition of the air/fuel mixture. Readers will learn about the advances in the reduction of jet noise and toxic fuel emissions-something that is being heavily regulated by relevant government agencies. Lead editor is one of the world's foremost combustion researchers, with contributions from some of the world's leading researchers in combustion engineering Covers all major areas of chemical propulsion-from combustion measurement, analysis and simulation, to advanced control of combustion processes, to noise and emission control Includes important information on advanced technologies for reducing jet engine noise and hazardous fuel combustion emissions
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 126
Get Book Here
Book Description
Work was completed on mixing, chemical-reaction, and combustion processes in turbulent, subsonic, and supersonic flows. Research included high-speed internal flows of interest to scramjet mixing and combustion, aimed at flow-control and flame holding issues. The control authority and mixing in subsonic and transonic flows affected by mass injection and heat release was quantified. In parallel, Large Eddy Simulation (LES) with Sub-Grid Scale (SGS) modeling of these flows was conducted with codes verified against predictions of Linear Stability Analysis (LSA) theory. Research on hydrocarbon combustion was conducted on premixed methane-air, ethane-air, and (diluted) ethylene-air flames. Detailed measurements of flame extinction strain-rate and flame speed were obtained at different compositions at atmospheric pressure. Direct Numerical Simulations (DNS) of axisymmetric unsteady flows in both cold and chemically reacting impinging jets with full chemistry were also performed. Experimental investigations of the three-dimensional full-field structure of scalar dispersion fields in grid turbulence were initiated.
Author: Carsten Baumgarten
Publisher: Springer Science & Business Media
ISBN: 3540308369
Category : Technology & Engineering
Languages : en
Pages : 312
Get Book Here
Book Description
A systematic control of mixture formation with modern high-pressure injection systems enables us to achieve considerable improvements of the combustion pr- ess in terms of reduced fuel consumption and engine-out raw emissions. However, because of the growing number of free parameters due to more flexible injection systems, variable valve trains, the application of different combustion concepts within different regions of the engine map, etc., the prediction of spray and m- ture formation becomes increasingly complex. For this reason, the optimization of the in-cylinder processes using 3D computational fluid dynamics (CFD) becomes increasingly important. In these CFD codes, the detailed modeling of spray and mixture formation is a prerequisite for the correct calculation of the subsequent processes like ignition, combustion and formation of emissions. Although such simulation tools can be viewed as standard tools today, the predictive quality of the sub-models is c- stantly enhanced by a more accurate and detailed modeling of the relevant pr- esses, and by the inclusion of new important mechanisms and effects that come along with the development of new injection systems and have not been cons- ered so far. In this book the most widely used mathematical models for the simulation of spray and mixture formation in 3D CFD calculations are described and discussed. In order to give the reader an introduction into the complex processes, the book starts with a description of the fundamental mechanisms and categories of fuel - jection, spray break-up, and mixture formation in internal combustion engines.
Author: William H. Heiser
Publisher: AIAA
ISBN: 9781563470356
Category : Science
Languages : en
Pages : 632
Get Book Here
Book Description
An almost entirely self-contained engineering textbook primarily for use in undergraduate and graduate courses in airbreathing propulsion. It provides a broad and basic introduction to the elements needed to work in the field as it develops and grows. Homework problems are provided for almost every individual subject. An extensive array of PC-based user-friendly computer programs is provided in order to facilitate repetitious and/or complex calculations. Annotation copyright by Book News, Inc., Portland, OR
Author: R. B. Edelman
Publisher:
ISBN:
Category :
Languages : en
Pages : 124
Get Book Here
Book Description
The overall objective of this study is the analysis of reacting multiphase flows in advanced air-breathing propulsion systems. This work involves the formulation and evaluation of new theoretical descriptions of multiphase turbulent mixing and chemical kinetic phenomena in subsonic and supersonic air flows, and the generation of new experimental data on these phenomena. Topics studied include: Spray Modeling; Modeling of Boron Combustion Processes; Modeling of Ramjet Combustion Processes: and Modeling of the Ducted Rocket Combustion Process.
Author: R. Borghi
Publisher: Springer Science & Business Media
ISBN: 146139631X
Category : Science
Languages : en
Pages : 958
Get Book Here
Book Description
Turbulent reactive flows are of common occurrance in combustion engineering, chemical reactor technology and various types of engines producing power and thrust utilizing chemical and nuclear fuels. Pollutant formation and dispersion in the atmospheric environment and in rivers, lakes and ocean also involve interactions between turbulence, chemical reactivity and heat and mass transfer processes. Considerable advances have occurred over the past twenty years in the understanding, analysis, measurement, prediction and control of turbulent reactive flows. Two main contributors to such advances are improvements in instrumentation and spectacular growth in computation: hardware, sciences and skills and data processing software, each leading to developments in others. Turbulence presents several features that are situation-specific. Both for that reason and a number of others, it is yet difficult to visualize a so-called solution of the turbulence problem or even a generalized approach to the problem. It appears that recognition of patterns and structures in turbulent flow and their study based on considerations of stability, interactions, chaos and fractal character may be opening up an avenue of research that may be leading to a generalized approach to classification and analysis and, possibly, prediction of specific processes in the flowfield. Predictions for engineering use, on the other hand, can be foreseen for sometime to come to depend upon modeling of selected features of turbulence at various levels of sophistication dictated by perceived need and available capability.
Author: A. G. Prudnikov
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 551
Get Book Here
Book Description
The report consists of two parts. Part One is concerned principally with the physics of the interaction of droplets or solid particles with a gas stream in the presence of heat and mass exchange and with the influence of these factors on the characteristics of the engine. The problems of liquid injection (the basic parameters of the fuel-supply system and methods of measurement) are considered, dimensionless relationships are cited for spray spectra in a supersonic stream, and ranges and vaporizabilities in fuel sprays are determined. Part Two describes the process of turbulent mixing for various boundary conditions with or without evolution of heat on the basis of a consistent method of calculation; the relationships obtained can be used to calculate turbulent mixing in the cases of free jet, jet at a wall, and a jet in a nozzle.
Author: S. N. B. Murthy
Publisher: AIAA
ISBN: 9781600863912
Category : Aerodynamics, Hypersonic
Languages : en
Pages : 558
Get Book Here
Book Description
Annotation Leading researchers provide a cohesive treatment of the complex issues in high-speed propulsion, as well as introductions to the current capabilities for addressing several fundamental aspects of high-speed vehicle propulsion development. Includes more than 380 references, 290 figures and tables, and 185 equations.
Author: B. N. Raghunandan
Publisher: Allied Publishers
ISBN: 9788177646900
Category : Technology & Engineering
Languages : en
Pages : 752
Get Book Here
Book Description
Contributed papers presented at the 7th National Conference on Air Breathing Engines and Aerospace Propulsion, hosted at I.I.T., Kanpur.
