Burning and sooting behavior of ethanol droplet combustion under microgravity conditions

Yozgatlıgil, Ahmet
In an effort to gain a better understanding of the burning and sooting behavior of ethanol, isolated droplet combustion experiments were performed in the 2.2-s drop tower at NASA Glenn Research Center. The measurement of the burning rate, soot standoff ratio, and soot volume fraction are described in which initial droplet diameter, oxygen concentration, and ambient pressure were varied. The experiments reveal that while ethanol droplets burn in 1-atm air without soot formation, luminous radiation from soot particles is observed at higher pressures, with increased sooting at higher oxygen volume fraction. Increases in the oxygen concentration at elevated pressures results in a non-monotonic behavior in the measured soot volume fraction. These experiments provide the first quantitative measurements of the soot volume fraction for ethanol droplet burning under microgravity conditions.


Influence of oxygen concentration on the sooting behavior of ethanol droplet flames in microgravity conditions
Yozgatlıgil, Ahmet; Choi, Mun Young; Kazakov, Andrei; Dryer, Frederick L. (Elsevier BV, 2007-1)
The influence of oxygen (O-2) concentration and inert on the sooting and burning behavior of large ethanol droplets under microgravity conditions was investigated through measurements of burning rate, flame temperature, sootshell diameter, and soot volume fraction. The experiments were performed at the NASA Glenn Research Center (GRC) 2.2 s drop tower in Cleveland, OH. Argon (Ar), helium (He), and nitrogen (N-2) were used as the inerts and the O-2 concentration was varied between 21% and 50% mole fraction a...
Combustion behavior and kinetics of a Turkish lignite blended with biomass/magnesite dust
Yousefzad Farrokhi, Farshid; Kazanç Özerinç, Feyza; Department of Mechanical Engineering (2017)
This study investigated the effect of blending on the combustion behavior of Turkish lignite blended with biomass or magnesite dust using a thermogravimetric analyzer (TGA) under air atmosphere. The lignite used in this study is Tunçbilek lignite (TL), which is blended with the biomass types; olive residue (OR) and almond shell (AS), and the inorganic industrial waste, magnesite dust (MD). The blends are composed of various weight fractions of fuels, with a constant weight fraction of molasses (10 wt. %) as...
Fuel-dependent Effects on Droplet Burning and Sooting Behaviors in Microgravity
MANZELLO, Samuel L.; PARK, Seul-Hyun; Yozgatlıgil, Ahmet; Choi, Mun Young (American Chemical Society (ACS), 2009-07-01)
Measurements of soot concentration and soot mass were performed in microgravity conditions for hexane, heptane, nonane, and decane droplets burning in air at the NASA Glenn Research Center (GRC) 2.2 s drop tower in Cleveland, OH. Experiments performed in air at 75.9 and 101.3 kPa indicate that the maximum soot Volume fractions and soot mass are similar, to within experimental uncertainty, for all of the fuels tested. The flame standoff ratios (FSR) did not vary significantly for the fuels considered. The so...
Combustion characteristics and retention-emission of selenium during co-firing of torrefied biomass and its blends with high ash coal
Ullah, Habib; Liu, Guijian; Yousaf, Balal; Ali, Muhammad Ubaid; Abbas, Qumber; Zhou, Chuncai (2017-12-01)
The combustion characteristics, kinetic analysis and selenium retention-emission behavior during co-combustion of high ash coal (HAC) with pine wood (PW) biomass and torrefied pine wood (TPW) were investigated through a combination of thermogravimetric analysis (TGA) and laboratory-based circulating fluidized bed combustion experiment. Improved ignition behavior and thermal reactivity of HAC were observed through the addition of a suitable proportion of biomass and torrefied. During combustion of blends, hi...
Combustion of Turkish lignites and olive residue: Experiments and kinetic modelling
Magalhaes, Duarte; Kazanç Özerinç, Feyza; Riaza, Juan; Erensoy, Sevgi; Kabakli, Ozde; Chalmers, Hannah (2017-09-01)
This study investigated the combustion behavior and kinetics of Turkish fuels. Two lignite coals from Tuncbilek and Soma region, and olive residue, were used, all within a size range of 106-125 mm. Experiments were performed in a thermogravimetric analyzer (TGA) coupled with a differential thermal analyzer (DTA), under three different heating rates, namely 15, 20, and 40 degrees C/min. Based on the weight loss (TG) and derivative weight loss (DTG) curves, the characteristic temperatures were determined, thr...
Citation Formats
A. Yozgatlıgil, M. Y. CHOI, A. KAZAKOV, and F. L. DRYER, “Burning and sooting behavior of ethanol droplet combustion under microgravity conditions,” COMBUSTION SCIENCE AND TECHNOLOGY, pp. 1985–1999, 2004, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/33224.