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Droplet Sizes And Velocities In A Transient Diesel Fuel Spray
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Book Synopsis Droplet Sizes and Velocities in a Transient Diesel Fuel Spray by : Ja-Ye Koo
Download or read book Droplet Sizes and Velocities in a Transient Diesel Fuel Spray written by Ja-Ye Koo and published by . This book was released on 1990 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Simultaneous droplet sizes and velocities were obtained for a transient diesel fuel spray in a quiescent chamber at atmospheric temperature and pressure. Instantaneous injection pressure, needle lift, and rate of injection were also measured, allowing calculation of the instantaneous nozzle discharge coefficient. Short-exposure still photographs were obtained at various chamber pressure and densities to further investigate this spray. Correlations between droplet size and velocity were determined at each crank angle to observe the detailed nature of the transient events occurring in this transient diesel fuel spray. As expected, peak mean and rms velocities are observed in the center of the spray. Measured average velocities are consistent with a calculated value, using the discharge coefficient for the nozzle and the known rate of fuel injection. The spray was nearly symmetric, with higher velocities occurring near the injector tip, and the radial dependence of velocity consistent with that observed from the spray photographs. Factors observed to effect the droplet size and velocity distributions and history include pump speed, fuel quantity delivered, and needle lift. Reprints. (aw).
Book Synopsis Characteristics of a Transient Diesel Fuel Spray by : Ja-Ye Koo
Download or read book Characteristics of a Transient Diesel Fuel Spray written by Ja-Ye Koo and published by . This book was released on 1991 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comparisons of Measured Drop Sizes and Velocities in a Transient Fuel Spray with Stability Criteria and Computed PDF's by : Ja-Ye Koo
Download or read book Comparisons of Measured Drop Sizes and Velocities in a Transient Fuel Spray with Stability Criteria and Computed PDF's written by Ja-Ye Koo and published by . This book was released on 1991 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two sets of comparisons were made in an attempt to provide a mechanism for understanding the behavior of transient sprays. First, detailed measurements of drop size and velocity in a transient spray were compared to established stability criteria for different droplet breakup mechanisms, specifically criteria for bag breakup and boundary layer stripping. Then, probability-density-functions were determined from the experimental data and compared, where appropriate, to different computed distributions (such as the Chi-square or log-hyperbolic distributions). Comparison with the stability criteria indicates that the a majority of droplets in the spray are susceptible to both breakup mechanisms near the injector tip. However, downstream, the spray appears to stabilize and any redistribution of droplet size must apparently be a result of collisions.
Book Synopsis Injection Pressure Effects Upon Droplet Behavior in Transient Diesel Sprays by : Calvin C. Hung
Download or read book Injection Pressure Effects Upon Droplet Behavior in Transient Diesel Sprays written by Calvin C. Hung and published by . This book was released on 1997 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Injection Pressure Effects Upon Droplet Behavior in Transient Diesel Sprays by : Calvin C. Hung
Download or read book Injection Pressure Effects Upon Droplet Behavior in Transient Diesel Sprays written by Calvin C. Hung and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper reports on the investigation of injection pressure upon the droplet behavior in transient diesel sprays. Phase/Doppler results for a Diesel spray with a maximum fuel injection line pressure of 105 MPa are compared with previously acquired droplet size and velocity measurements for a Diesel spray with an injection pressure of 21 MPa. All measurements reported here were made in atmospheric conditions at a position near the nozzle. It is shown in these results that the droplet velocity and size profiles do maintain similarity despite the substantial change in injection pressure. Specific characteristics, for example, the appearance of subtle waves in the time dependent spray data, are present in both data sets. Comparison of the measured droplet velocities and diameters with Weber number based stability criteria shows that increased injection pressure produces a higher percentage of droplets that are likely to breakup. This is mostly the result of increases in droplet velocities with higher injection pressure. The interior region of the higher pressure spray is an area extremely difficult to probe, despite the application of temporal optimization of the phase/Doppler anemometer. Inherent characteristics of the injection that affect the ability to acquire data are described, as well as some of the operational difficulties experienced in using a phase/Doppler for diesel spray droplet measurements.
Book Synopsis Insights Into Droplet Behavior Within High Pressure Diesel Sprays by : Calvin C. Hung
Download or read book Insights Into Droplet Behavior Within High Pressure Diesel Sprays written by Calvin C. Hung and published by . This book was released on 1998 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Breakup of Liquid Sheets and Jets by : S. P. Lin
Download or read book Breakup of Liquid Sheets and Jets written by S. P. Lin and published by Cambridge University Press. This book was released on 2003-08-21 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, first published in 2003, is an exposition of what we knew about the physics underlying the onset of instability in liquid sheets and jets. Wave motion and breakup phenomena subsequent to the onset of instability are carefully explained. Physical concepts are established through rigorous mathematics, accurate numerical analyses and comparison of theory with experiment. Exercises are provided for students, and these help familiarize the reader with the required mathematical tools. This book further provides a rational basis for designing equipment and processes involving the phenomena of sheet and jet breakup. Researchers interested in transition to turbulence, hydrodynamic stability or combustion will find this book a highly useful resource, whether their background lies in engineering, physics, chemistry, biology, medicine or applied mathematics.
Book Synopsis Transient Characteristics of Fuel Atomization and Droplet Size Distribution in Diesel Fuel Spray by : Kiichiro Takeuchi
Download or read book Transient Characteristics of Fuel Atomization and Droplet Size Distribution in Diesel Fuel Spray written by Kiichiro Takeuchi and published by . This book was released on 1983 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Time-resolved Measurements of Drop Size Distribution in a Transient Fuel Spray by : Brian Paul Sangeorzan
Download or read book Time-resolved Measurements of Drop Size Distribution in a Transient Fuel Spray written by Brian Paul Sangeorzan and published by . This book was released on 1983 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Air Entrainment Into a Transient Diesel Spray Visualized Using Particle Image Velocimetry by : Jodi Marie Hansen Kozma
Download or read book Air Entrainment Into a Transient Diesel Spray Visualized Using Particle Image Velocimetry written by Jodi Marie Hansen Kozma and published by . This book was released on 1996 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Droplet Size Distribution of Transient Diesel Spray by : Yohan Chi
Download or read book Measurement of Droplet Size Distribution of Transient Diesel Spray written by Yohan Chi and published by . This book was released on 1993 with total page 7 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 2017-12-11 with total page 433 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 Characteristics of Air Flow Surrounding Transient Diesel Sprays by : Dong-Ryul Rhim
Download or read book Characteristics of Air Flow Surrounding Transient Diesel Sprays written by Dong-Ryul Rhim and published by . This book was released on 2002 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Two-Phase Flow for Automotive and Power Generation Sectors by : Kaushik Saha
Download or read book Two-Phase Flow for Automotive and Power Generation Sectors written by Kaushik Saha and published by Springer. This book was released on 2018-11-03 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the two-phase flow problems relevant in the automotive and power generation sectors. It includes fundamental studies on liquid–gas two-phase interactions, nucleate and film boiling, condensation, cavitation, suspension flows as well as the latest developments in the field of two-phase problems pertaining to power generation systems. It also discusses the latest analytical, numerical and experimental techniques for investigating the role of two-phase flows in performance analysis of devices like combustion engines, gas turbines, nuclear reactors and fuel cells. The wide scope of applications of this topic makes this book of interest to researchers and professionals alike.
Book Synopsis A Study of Droplet Velocity and Diameter Measurements in a Reacting Diesel Spray Produced by a Flow-blurring Injector by : Yasin Gokmen
Download or read book A Study of Droplet Velocity and Diameter Measurements in a Reacting Diesel Spray Produced by a Flow-blurring Injector written by Yasin Gokmen and published by . This book was released on 2018 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: In many combustion applications such as gas turbines, liquid fuel atomization is important to obtain lower emissions of nitrogen oxides (NOx), carbon monoxide (CO), unburned hydrocarbons (UHCs), and soot particles. Thus, understanding spray characteristics is essential for determining how fuel and air mix with each other and subsequently combustion takes place. In this experimental study, Phase Doppler particle analyzer (PDPA) and OH* Chemiluminescence (CL) imaging techniques are employed as a diagnostic technique to monitor the spray characteristics in the cold and reacting regions of a diesel spray flame using a flow-blurring (FB) injector. PDPA is a well-known technique to measure the diameter and velocity of spherical particles. PDPA is used in many research applications including fuel injection, spray, and combustion. PDPA system does not disturb the flow being measured, and thus, it is preferable over intrusive measurement techniques. A baseline case using a FB injector with a 3 mm orifice exit diameter and no inner slant is studied and operated at air to liquid mass ratio (ALR) of 2.0, heat release rate (HRR) of 60 kW, and equivalence ratio (Ï6) of 0.75. First, OH* chemiluminescence imaging is used to analyze the flame structure. Next, PDPA is used to acquire velocity and Sauter mean diameter (SMD) distributions in cold and flame regions. Then, a parametric study is performed by varying the ALR, and its influence on the diameter and velocity of the fuel droplets is investigated. The findings from OH* CL images suggest that as the ALR increases, the FB injector produces fine droplets and enhances secondary atomization to disintegrate the droplets further. Furthermore, the results show that FB injector produces finer droplets and mean axial velocity increases as ALR is increased. The Sauter mean diameter (SMD) and mean axial velocity decreases as the droplets enter the flame zone because heat released leads to droplet evaporation. Therefore, the larger droplets become finer whereas finer droplets are completely vaporized and mixed with the air.
Book Synopsis International Journal of Fluid Mechanics Research by :
Download or read book International Journal of Fluid Mechanics Research written by and published by . This book was released on 1999 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Optical Diagnostics for Flow Processes by : P. Buchhave
Download or read book Optical Diagnostics for Flow Processes written by P. Buchhave and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 387 pages. Available in PDF, EPUB and Kindle. Book excerpt: The origin of optical methods for fluid flow investigations appears to be nontraceable. This is no matter for surprise. After all seeing provides the most direct and common way for humans to learn about their environment. But at the same time some of the most sophisticated methods for doing measurements in fluids are also based on light and often laser light. A very large amount of material has been published in this area over the last two decades. Why then another publication? Well, the field is still in a state of rapid development. It is characterised by the use of results and methods developed within very different areas like optical physics, spectroscopy, communication systems, electronics and computer science, mechanical engineering, chemical engineering and, of course, fluid dynamics. We are not aware of a book containing both introductory and more advanced material that covers the same material as presented here. The book is the result of a compilation and expansion of material presented at a summer school on Optical Diagnosticsfor Flow Processes,held at RiS0 National Laboratory and the Technical University of Denmark in September 1993. The aim of the course was to provide a solid background for understanding, evaluating, and using modem optical diagnostic methods, addressing Ph. D. students and researchers active in areas of fluid flow research. The disciplines represented by the participants ranged from atmospheric fluid dynamics to biomedicine.
