An Experimental Study of Droplet Combustion at High-pressures
Author : Christian M. Norton
Publisher :
Page : 176 pages
File Size : 13,56 MB
Release : 1990
Category : Liquid propellant rockets
ISBN :
Author : Christian M. Norton
Publisher :
Page : 176 pages
File Size : 13,56 MB
Release : 1990
Category : Liquid propellant rockets
ISBN :
Author : Chris M. Norton
Publisher :
Page : pages
File Size : 29,80 MB
Release : 1990
Category :
ISBN :
Author : Hiroshi Nomura
Publisher :
Page : 16 pages
File Size : 14,97 MB
Release : 1998
Category :
ISBN :
Author : G. B. Petrazhitskiĭ
Publisher :
Page : 28 pages
File Size : 49,19 MB
Release : 1964
Category : Atomization
ISBN :
Author : Saptarshi Basu
Publisher : Springer
Page : 433 pages
File Size : 12,14 MB
Release : 2017-12-11
Category : Technology & Engineering
ISBN : 9811074496
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.
Author :
Publisher :
Page : 702 pages
File Size : 14,76 MB
Release : 1995
Category : Aeronautics
ISBN :
Author : Cameron Mark Verwey
Publisher :
Page : 0 pages
File Size : 25,90 MB
Release : 2017
Category :
ISBN :
The performance of liquid-fuelled spray combustion systems has a massive impact on the efficiency of energy production in many sectors across the globe. Realistic combustors generate sub 100-μm droplets and operate under high pressure and temperature in strong turbulence. Investigations into droplet evaporation and combustion provide fundamental knowledge and validation data regarding the behaviour of sprays, and although single droplet approaches have been a staple of energy research for many decades, there is little information regarding the effect of turbulence and initial diameter, especially micro-sized, on droplet evaporation rates. The present experimental study develops, interprets, and correlates the results of almost 500 tests performed on isolated heptane and decane droplets. Droplets in the range of 110 - 770 μm (initial diameter) were generated and suspended on small intersecting micro-fibers in a spherical fan-driven chamber and exposed to quasi-zero mean turbulence of intensity up to 1.5 m/s, temperatures ranging from 25 - 100°C, and pressures between 1 and 10 bar. The results indicate that droplet size has a major influence on evaporation rate, as measured by the temporal reduction in droplet surface area, when the environment is turbulent. Evaporation rates increased with both initial diameter and turbulence intensity at all test conditions. The effectiveness of turbulence, defined as the ability of turbulence to improve the evaporation rate over the rate of a stagnant droplet at identical ambient conditions, increased with pressure but decreased with temperature. Both the ratio of Kolmogorov length scale to droplet diameter and the theoretical molar concentration gradient of fuel at the droplet surface are found to be excellent predictors of turbulence effectiveness. Correlation approaches utilizing a turbulent Reynolds number or a vaporization Damköhler number are suggested to predict the evaporation rate of a single droplet exposed to a purely turbulent flow field.
Author : J. Sato
Publisher :
Page : pages
File Size : 40,15 MB
Release : 1993
Category :
ISBN :
Author : Jorg Stengele
Publisher :
Page : 8 pages
File Size : 12,64 MB
Release : 1997
Category :
ISBN :
Author :
Publisher :
Page : 0 pages
File Size : 48,34 MB
Release : 2001
Category :
ISBN :
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.