Download or read book Study of the Sub and Supercritical Behavior of Fuel Droplets and Jets written by Yaw Yeboah and published by . This book was released on 1998 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: A project to conduct experiments to understand the flow and thermodynamic characteristics of liquid fuel droplets and jets in subcritical and supercritical environments was initiated. In the project initiation phase (Phase I), the literature on the subject matter was updated, the experimental setup was designed and modifications in the setup including installation of thermocouples, pressure transducers and analytical and diagnostic devices (LDV, PIV and high speed video imaging systems were either initiated or completed. Preliminary experiments on suspended and free falling hexane droplet gasification and combustion under subcritical and supercritical pressure conditions were undertaken. The preliminary results were very interesting and promising especially with respect to the variation of gasification rate with increasing pressure and decreasing droplet size and the effect of buoyancy on the burning droplet. The project remained slightly ahead of schedule at the end of the reporting period.
Download or read book Study of the Sub and Supercritical Behavior of Fuel Droplets written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of the droplet gasification and combustion characteristics of hydrocarbon fuel droplets was conducted at sub- and supercritical. The experimental setup provided quiescent and convective environments under supercritical pressure and temperature conditions. The droplet combustion experiment hardware consisted of: a liquid pressurizing and transfer system; a high pressure and temperature combustion chamber; a droplet formation, deployment and ignition system; and a high speed CCD imaging system. The gasification and combustion characteristics of droplets of several hydrocarbons under quiescent environments were studied. Specifically, the mass emission rates and combustion characteristics of 1.5-mm-diameter suspended droplets of a series of hydrocarbons ranging from hexane (C6) to tetradecane (Cl4) were measured at sub- and supercritical pressures and temperatures using the high-speed image system. The images of droplet gasification and combustion revealed interesting phenomena and provided better understanding of the droplet behavior in sub- and supercritical pressure and temperature environments.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Liquid Propellant Droplet Combustion and Cluster Behavior at Supercritical Conditions written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A systematic investigation of superoritical droplet vaporization and cluster behavior has been conducted based on the complete conservation equations in both the gas and liquid phases. The research work addresses a variety of fundamental issues related to droplet vaporization and dynamics at realistic conditions typical of liquid-propellant rocket combustion devices. A unified treatment of real-fluid thermodynamics has been developed based on fundamental theories. Special attention was given to the thermodynamic non-ideality and transport anomaly in the transcritical regime. A series of calculations has been performed to examine the cluster behavior of liquid oxygen (LOX) droplets in both sub- and super-critical hydrogen environments. Results show that pressure has strong effect on droplet interactions, while the temperature effect is relatively minor at high pressures. The hydrogen density plays a decisive role in determining droplet interactions through its influence on the temperature and mass fraction gradients at the LOX droplet surface. The characteristics of LOX droplet vaporization in forced-convective environments has also been studied. A dimensionless parameter We/Oh 1/2, which represents the ratio of aerodynamic and viscous forces, is found to be the major factor determining the droplet deformation under supercritical conditions. Results of droplet lifetime are well correlated as a function of the initial droplet Reynolds number and pressure. Finally, the interactions between two droplets moving in tandem in supercritical convective environments were investigated in detail.
Download or read book Sub and Super Critical Evaporation and Combustion of a Moving Droplet written by George Gogos and published by . This book was released on 2001 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We are conducting a comprehensive computational study of fuel droplet evaporation and combustion in sub- and super-critical ambient conditions under forced convection. An experimentally validated model for a moving spherical droplet that undergoes evaporation has been developed. The model is used to predict droplet lifetimes and droplet penetration distances over a wide range of ambient pressures. In addition, a low pressure, experimentally validated model for a moving spherical droplet that undergoes combustion has been developed. This model employs a one-step overall reaction and is used to predict extinction velocities for different size droplets. Future work will allow for droplet deformation and semi-detailed chemical kinetics.
Download or read book A Study of the Transient Behavior of Fuel Droplets During Combustion Theoretical Considerations for Aerodynamic Stripping written by Herman Krier and published by . This book was released on 1971 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The steady or quasi-steady combustion of isolated droplets or droplet sprays has been studied extensively and is reasonably well understood, but the problem of transient gas dynamics coupled to droplet combustion is poorly understood and adequate models to describe the phenomena have yet to be proposed. The problem is, however, extremely important to the technology of combustion devices. Aside from the detonation of spray droplet mixtures, in which droplet breakup and combustion are occurring under extremely transient conditions, a full descriptive theory of this phenomena will be invaluable in furthering an understanding of such phenomena as liquid rocket engine instabilities, engine thrust transients, combustion in liquid propellant gun systems, high pressure fuel-air gun systems, spray ignition mechanisms, and hybrid rocket dynamics. The report presents a theoretical analysis of one important phase of heterogeneous flow, a model for the aerodynamic stripping of fuel from the assumed spherical droplets.
Download or read book Paper written by and published by . This book was released on 1999 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Joint Meeting of the U S Sections of the Combustion Institute Western States Central States Eastern States written by and published by . This book was released on 1999 with total page 954 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ASME Technical Papers written by and published by . This book was released on 1999 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Advances In Spray Combustion written by Kenneth K. Kuo and published by AIAA. This book was released on 1996 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ARO and AFOSR Contractors Meeting in Chemical Propulsion Held in Virginia Beach Virginia on 3 6 June 1996 written by David M. Mann and published by . This book was released on 1996 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Partial contents: Supercritical droplet behavior; Fundamentals of acoustic instabilities in liquid-propellant rockets; Modeling liquid jet atomization proceses; Liquid-propellant droplets dynamics and combustions in supercritical forced convective environments; Contributions of shear coaxial injectors to liquid rocket motor combustion instabilities; High pressure combustion studies under combustion driven oscillatory flow conditions; Droplet collision on liquid propellant combustion; Combustion and plumes; Development of a collisional radiative emission model for strongly nonequilibrium flows; Energy transfer processes in the production of excited states in reacting rocket flows; modeling nonequilibrium radiation in high altitude plumes; kinetics of plume radiation, and of HEDMs and metallic fuels combustion; Nonsteady combustion mechanisms of advanced solid propellants; Chemical mechanisms at the burning surface. p15
Download or read book Dynamics of Droplets written by Arnold Frohn and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book deals with the dynamical behaviour of single droplets and regular droplet systems. It has been written mainly for experimental researchers. After a short description of the theoretical background, the different experimental facilities and methods necessary for the investigation of single droplets are described in detail. A summary of important applications is included.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1972 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fluid Dynamics and Transport of Droplets and Sprays written by W. A. Sirignano and published by Cambridge University Press. This book was released on 2010-01-11 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the theoretical foundations of spray and droplet applications relevant to the technology for active control of sprays applied to new products and applications, improved product performance, cost reductions, and improved environmental outcomes. It also covers theory related to power and propulsion; materials processing and manufacturing technologies including droplet-based net form processing, coating, and painting; medication; pesticides and insecticides; and other consumer uses.
Download or read book Progress In Astronautics and Aeronautics written by Mohammed Habiballah and published by AIAA. This book was released on 2004 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 2015 2016 Assessment of the Army Research Laboratory written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2017-05-01 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: The National Academies of Sciences, Engineering, and Medicine's Army Research Laboratory Technical Assessment Board (ARLTAB) provides biennial assessments of the scientific and technical quality of the research, development, and analysis programs at the Army Research Laboratory (ARL), focusing on ballistics sciences, human sciences, information sciences, materials sciences, and mechanical sciences. This biennial report summarizes the findings of the ARLTAB from the reviews conducted by the panels in 2015 and 2016 and subsumes the 2015-2016 interim report.
Download or read book NASA SP written by and published by . This book was released on 1993 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
