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Combustion Of Liquid Droplets Entrained In A Hot Gas Stream
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Book Synopsis Combustion of Liquid Droplets Entrained in a Hot Gas Stream by : Miguel Angel Salabarria y Betancourt
Download or read book Combustion of Liquid Droplets Entrained in a Hot Gas Stream written by Miguel Angel Salabarria y Betancourt and published by . This book was released on 1965 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Combustion of Heptane Droplets in a Hot Gas Flow by : Joel Lawrence Bert
Download or read book Combustion of Heptane Droplets in a Hot Gas Flow written by Joel Lawrence Bert and published by . This book was released on 1967 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Ignition and Combustion of Fuel Droplets and the Ignition of Premixed Fuels by Hot Cylindrical Surfaces by : Roger H. Rangel
Download or read book On the Ignition and Combustion of Fuel Droplets and the Ignition of Premixed Fuels by Hot Cylindrical Surfaces written by Roger H. Rangel and published by . This book was released on 1985 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vaporization, Ignition, and Combustion of Two Parallel Fuel Droplet Streams by : R. H. Rangel
Download or read book Vaporization, Ignition, and Combustion of Two Parallel Fuel Droplet Streams written by R. H. Rangel and published by . This book was released on 1987 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analysis of the combined mechanisms of heat transfer, vaporization, ignition, and combustion of two parallel fuel droplet streams injected in a hot, oxidizing gas flow is presented. The analysis gives a qualitative understanding of the various complex phenomena involved in the vaporization and ignition of one stream of droplets followed by the propagation of the flame to a second stream and the establishment of diffusion flames surrounding each droplet stream. The two-dimensional physical model consists of a constant-property oxidizing gas flowing with a uniform velocity between two insulated planes. The temperature of the gas at the inlet of the channel is specified. The fuel droplet streams are represented as two parallel droplet sheets injected at prescribed locations within the gas flow. Liquid temperature, droplet radius, as well as droplet sheet density and velocity are specified at the inlet. Keywords: Spray combustion, Ignition of sprays, Flame propagation in sprays.
Book Synopsis Ignition of Fuel Droplets in Hot Stagnant Gases by : Gordon Alfred Long
Download or read book Ignition of Fuel Droplets in Hot Stagnant Gases written by Gordon Alfred Long and published by . This book was released on 1967 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Combustion of a System of Liquid Droplets by : N. V. Fedoseeva
Download or read book Combustion of a System of Liquid Droplets written by N. V. Fedoseeva and published by . This book was released on 1972 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The investigation of a system of burning droplets of liquid fuel is given. The droplet combustion velocity is determined as a function of the number of droplets and the distance between them. The results obtained are compared with the rate of combustion of a single drop of liquid fuel. It is established that the droplet combustion velocity does not vary monotonically as a function of the distance between the droplets. (Author).
Book Synopsis The Evaporation Rate of Liquid Droplets in a Hot Gas by : Frederic William Hartwig
Download or read book The Evaporation Rate of Liquid Droplets in a Hot Gas written by Frederic William Hartwig and published by . This book was released on 1952 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis the generation and burning of uniform-size liquid drops by : jay a. bolt, thomas a. boyle, william mirsky
Download or read book the generation and burning of uniform-size liquid drops written by jay a. bolt, thomas a. boyle, william mirsky and published by . This book was released on 1955 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Vaporization and Self-ignition of Liquid Fuel Drops by : Mohamed Ibrahim Abdou
Download or read book The Vaporization and Self-ignition of Liquid Fuel Drops written by Mohamed Ibrahim Abdou and published by . This book was released on 1962 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis technique for burning single fuel droplets by : william mirsky
Download or read book technique for burning single fuel droplets written by william mirsky and published by . This book was released on 1952 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Combustion Dynamics of Liquid Droplets and Turbulent Jets Relevant to Rocket Engines by : Miguel Angel Plascencia Quiroz
Download or read book Combustion Dynamics of Liquid Droplets and Turbulent Jets Relevant to Rocket Engines written by Miguel Angel Plascencia Quiroz and published by . This book was released on 2021 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: These experiments examined the reactive processes involving nanoparicle laden liquid droplets, and turbulent jet flames as two separate sets of studies. The first part of this dissertation (Chapters 2 and 3) deals with the combustion of ethanol liquid droplets loaded with nano particulate additives using different droplet formation methods. For this study, an apparatus at the Energy and Propulsion Research Laboratory at UCLA was used to keep the droplet in a quiescent environment. Three different types of droplet combustion experiments were performed, involving: (I) the classic single droplet suspended from a quartz fiber, (II) a single droplet suspended from a quartz capillary, (III) a burning droplet that has continual fuel deliver to sustain the droplet for longer periods of time during the combustion process. Two alternative nanoparticles were explored to demonstrate the effect of energetic additives: reactive nano aluminum (nAl) and inert nano silicon dioxide (nSiO2), each having nominal average diameters of 80 nm. Simultaneous high speed visible and OH* chemiluminescence images were taken to determine the shape of the droplet over time and hence the burning rate constant (K), flame standoff distance, and mean OH* chemiluminescence intensity with varying particulate concentrations. Visible imaging showed particle/vapor ejections and jetting in continuously fed droplet experiments, while rod-suspended burning droplets showed limited particle ejection, usually towards the end of the droplet lifetime. The nSiO2-laden, rod-suspended droplets formed a porous, shell-like structure resembling the shape of a droplet at higher nSiO2 concentrations, in contrast to smaller residue structures left for nAl-laden droplets. A systematic increase in the burning rate constant was observed as the loading concentration of nAl was increased from 1wt%-6wt%. The droplet with continual fuel delivery had the greatest improvement in K of 13% over the pure fuel value. For nSiO2, the continuously fed droplet showed the greatest increase of 5% at 1 wt% loading concentrations, and no consistent trend was observed for nSiO2, likely due to the large shell-like residue structures in the latter stages of combustion. Transmission electron microscopy (TEM) images of particle residue revealed additional insights.The second part of this dissertation (Chapters 4 and 5) studied reacting gaseous turbulent jets in a newly constructed experiment at the Air Force Research Laboratory (AFRL/RQR) located at Edwards Air Force base. This experimental study aimed to characterize the coupling of an acoustic field with a turbulent gaseous methane nonpremixed flame under atmospheric pressure conditions. Two separate injection configurations were examined: one that involved a classic single methane jet surrounded by a minimal velocity oxidizer co-flow and a second coaxial jet configuration with annular oxidizer flow and the same low-velocity co-flow. The different jets were placed within an acoustic waveguide in which standing waves could be created using several speakers. The reacting jets could thus be situated at either a pressure node or a pressure anti-node location. High-speed Schlieren and OH* chemiluminescence images recorded the near field behavior of the flame under both unforced and acoustically forced conditions. High-speed imaging showed two different phenomena associated with these standing waves. When the flame was forced while situated at a pressure node, a sinuous oscillatory response of the flame was observed, in addition to transverse oscillations of the center fuel jet, which shortened the intact fuel core length. The flame "flattened" into an ellipsoidal shape in the direction of the acoustic waves. Conversely, at a pressure anti-node, the coupling of the acoustics and flame gave rise to an axisymmetric response (puff-like oscillations), which prompted the flame to become unstable at the anchoring region. This could lead to periodic liftoff or permanent flame liftoff. A receptivity study for a methane jet at Reynolds number of 5,300 and an ambient oxygen concentration of 40\% showed that the reacting jet was able to respond at the frequency of the unsteady acoustic field for a range of frequencies, but with a diminishing response of the flame for both the pressure node and the pressure anti-node under high frequency excitation. Proper Orthogonal Decomposition (POD) analysis was able to extract mode shapes and frequencies based on pixel intensity fluctuations. For the cases of pressure node forcing, this analysis method illustrated the different modes of flame oscillation, in many cases which were similar to corresponding low Reynolds number fuel jet experiments with pressure node excitation conducted at UCLA. A forcing susceptibility diagram was created to map the three different anchoring stability regimes the flame experienced under pressure anti-node forcing, demonstrating the need for higher amplitude excitation required for the flame to lift off when forced at higher frequency pressure anti-node conditions. As an extension to the single jet, the shear coaxial jet configuration kept the center fuel and surrounding oxidizer co-flow constant. Only the outer annular oxidizer flowrate was varied, with annulus-to-inner jet velocity ratios ranging from R = 0.05 to 0.3, to investigate its impact on the flame's ability to respond to the acoustics. In the absence of acoustic excitation, the coaxial jet did demonstrate natural shear layer/wake like instabilities at higher annular-to-jet velocity ratios, for R = 0.17 and 0.3. The dynamical response of the coaxial jet to pressure node excitation exhibited similar characteristics to that of the single jet for a range of forcing frequencies. But when forced at a pressure anti-node, a notable difference between the two configurations was found. The shear coaxial jet was more responsive to the acoustic forcing at higher forcing frequencies, for example, than the single fuel jet. The susceptibility diagrams for the full range of annular-to-inner jet velocity ratios demonstrated opposite trends when compared to the single jet, that is, that the coaxial jet was more responsive to excitation at a given excitation amplitude when the forcing frequency was higher, and thus closer to the natural coaxial jet instability frequency. Hence evidence suggests that the natural instabilities of the coaxial jet shear layer may be causing the difference in susceptibility diagrams. Both sets of experimental studies here, the nanofuel droplet combustion studies and the acoustically-coupled turbulent fuel jet combustion experiments, provide useful advances to our understanding of reactive flows relevant to liquid rocket engine systems. Enhancement in burning rates with nanoparticulate additives show potential benefits for rocket fuels, and attendant benefits are documented in the presence of acoustic disturbances, studied separately [1]. AFRL-based acoustically coupled turbulent fuel jet studies reveal different dynamical characteristics, depending on the injection system and the acoustic frequency and amplitude range. Different characteristic signatures extracted via POD analysis are both relevant in understanding combustion instabilities and in developing reduced order models underlying control of such instabilities. The present studies contribute to these goals in important ways.
Book Synopsis Droplet Gasification and Combustion in Simulated Reduced-gravity and Normal-gravity Environments by : Difei Wang
Download or read book Droplet Gasification and Combustion in Simulated Reduced-gravity and Normal-gravity Environments written by Difei Wang and published by . This book was released on 1997 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Droplets and Sprays by : Saptarshi Basu
Download or read book Droplets and Sprays written by Saptarshi Basu and published by Springer. This book was released on 2019-02-14 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on droplets and sprays relevant to combustion and propulsion applications. The book includes fundamental studies on the heating, evaporation and combustion of individual droplets and basic mechanisms of spray formation. The contents also extend to the latest analytical, numerical and experimental techniques for investigating the behavior of sprays in devices like combustion engines and gas turbines. In addition, the book explores several emerging areas like interactions between sprays and flames and the dynamic characteristics of spray combustion systems on the fundamental side, as well as the development of novel fuel injectors for specific devices on the application side. Given its breadth of coverage, the book will benefit researchers and professionals alike.
Book Synopsis Evaporation and Self-ignition of Multi-component Hydrocarbon Fuel Oil Droplets by : Michel Isaac Michael
Download or read book Evaporation and Self-ignition of Multi-component Hydrocarbon Fuel Oil Droplets written by Michel Isaac Michael and published by . This book was released on 1964 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Evaporation of Liquid Droplets in Highly Turbulent Gas Streams by : Richard Gould
Download or read book The Evaporation of Liquid Droplets in Highly Turbulent Gas Streams written by Richard Gould and published by . This book was released on 1998 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single acetone and heptane droplets were suspended from a hypodermic needle in turbulent airflow, and the Nusselt number was obtained from direct measurements of the droplet diameter and evaporation rate. Acetone was selected because it fluoresces when irradiated with ultraviolet laser radiation while heptane was selected because of its high volatility compared with water, methanol, and ethanol which were used previously. Planar laser induced fluorescence (PLIF) measurements were made to obtain qualitative concentration measurements of gaseous acetone in the boundary layer surrounding the droplet. The goal of these measurements was to give insight as to why the evaporation rate is increased by 50 % when the gas phase turbulence is increased from the laminar flow case to the case where the freestream turbulence is 10%. The use of acetone droplets required that the influence of humidity on droplet evaporation rate be considered. Measurements of the turbulence intensity of heated freestream air were also made. Finally, many modifications to improve the experimental apparatus were made during this research project.
Book Synopsis The Combustion of Multi-component Liquid Fuel Droplets by : J. B. Jordan
Download or read book The Combustion of Multi-component Liquid Fuel Droplets written by J. B. Jordan and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Theoretical Investigation of Liquid Droplet Evaporation in a High Velocity Gas Stream by : Miguel A. Rivas
Download or read book A Theoretical Investigation of Liquid Droplet Evaporation in a High Velocity Gas Stream written by Miguel A. Rivas and published by . This book was released on 1951 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: