Sooting behavior of ethanol droplet combustion at elevated pressures under microgravity conditions

2004-01-01
URBAN, BRADLEY D
KROENLEİN, KENNETH
KAZAKOV, ANDREİ
DRYER, FREDERİCK L
Yozgatlıgil, Ahmet
CHOI, MUN YOUNG
MANZELLO, SAMUEL L
LEE, KYEONG OOK
DOBASHİ, RİTSU
Show full item record
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
225
views
0
downloads
Liquid ethanol is widely used in practical fuels as a means to extend petroleum-derived resources or as a fuel additive to reduce emissions of carbon monoxide from spark ignition engines. Recent research has also suggested that ethanol and other oxygenates could be added to diesel fuel to reduce particulate emissions. In this cursory study, the combustion of small ethanol droplets in microgravity environments was observed to investigate diffusion flame characteristics at higher ambient pressures and at various oxygen indices, all with nitrogen as the diluent species. At the NASA Glenn Research Center 2.2-second drop tower free ethanol droplets were ignited in the Droplet Combustion Experiment (DCE) apparatus, and backlit and flame view data were collected to evaluate flame position and burning rate. Profuse sooting was noted above 3 atm ambient pressure. In experiments performed at the Japan Microgravity Center 10-second (JAMIC) drop shaft with Sooting Effects in Droplet Combustion (SEDC) apparatus, the first data that displayed a spherical soot shell for ethanol droplet combustion was obtained. Because of the strong sensitivity of soot formation to small changes in an easily accessible range of pressures, ethanol appears to be a simple liquid fuel suitable for fundamental studies of soot formation effects on spherical diffusion flames. The results impact discussions regarding the mechanism of particulate reduction by ethanol addition to fuels in high-pressure practical combustors.
General Engineering, Modelling and Simulation, General Physics and Astronomy, Applied Mathematics
https://hdl.handle.net/11511/36692
MICROGRAVITY SCIENCE AND TECHNOLOGY
Department of Mechanical Engineering, Article

Suggestions

NUMERICAL INVESTIGATION OF BUBBLING FLUIDIZED BED TO BE USED AS THERMAL ENERGY STORAGE INTEGRATED TO HIGH-TEMPERATURE CONCENTRATED SOLAR POWER
HİÇDURMAZ, SERDAR; Tarı, İlker (Begell House, 2018-01-01)
A thermal energy storage unit designed to be used in a solid particle concentrated solar energy system is analyzed with the help of ANSYS Fluent 17.0. Hydrodynamics of the bubbling fluidized sand bed of 0.28 m × 1 m × 0.025 m dimensions to be used as a direct contact heat exchanger is modeled and validated. Geldart B-type particles with diameter of 275 micrometers and density of 2500 kg/m3 are used in modeling of bubbling fluidized sand bed. A Syamlal−O'Brien drag model with restitution coefficient of 0.99 ...
Comparison of engine performance and emissions for conventional petroleum diesel fuel and diesel-ethanol blends
Erkal, Gül; Yozgatlıgil, Ahmet; Department of Mechanical Engineering (2010)
Ethanol is an environmental friendly alternative diesel fuel that has received significant attention both as a possible renewable alternative fuel and as an additive to existing petroleum-based fuels. Beyond simply representing an additional fuel supply, ethanol exhibits several advantages when compared to existing petroleum fuel. The objective of this work is to investigate experimentally the effects of using different blends of specified percentages of ethanol on the engine performance and emissions and t...
Passive flow control in liquid-propellant rocket engines with cavitating venturi
Ulaş, Abdullah (Elsevier BV, 2006-04-01)
In a companion liquid rocket engine development project, due to the overall weight constraint of the propulsion system, a cavitating venturi is selected to control the liquid fuel and liquid oxidizer mass flow rates. Two cavitating venturis, one for the fuel and the other for the oxidizer, are designed to deliver the desired mass flow rates for a specified operating inlet pressure, temperature, and inlet cross-sectional area. The converging and diverging angles of the venturis are selected from the literatu...
Etherification rates of 2-methyl-2-butene and 2-methyl-1-butene with ethanol for environmentally clean gasoline production
Oktar, N; Murtezaoglu, K; Dogu, G; Gonderten, I; Doğu, Timur (Wiley, 1999-02-01)
Etherification of C-5 reactive olefins available in light fluidized catalytic cracking (FCC) gasoline is an attractive way to decrease the olefins and to increase the octane number. The reactivities of 2-methyl-1-butene (2M1B) and 2-methyl-2-butene (2M2B) in the etherification reaction with ethanol catalysed by a strongly acidic macroreticular resin catalyst were investigated in a temperature range of 333-360 K using a liquid phase differential flow reactor. In the presence of excess alcohol, the apparent r...
Combinatorial development of LSC-113/LSC-214 cathode materials for intermediate temperature solid oxide fuel cells
Sarı, Doğancan; Öztürk, Tayfur; Kalay, Yunus Eren; Department of Metallurgical and Materials Engineering (2017)
Solid oxide fuel cells are environmentally friendly, efficient and fuel versatile energy conversion devices which suffer from high operating temperatures. For lowering the operating temperatures of solid oxide fuel cells (SOFC), LSC-113/LSC-214 composite cathodes have recently attracted much attention due to their enhanced kinetics. However, the full potential of this novel system is still unknown. In this study, a combinatorial approach was used to develop cathode materials which would reduce operating tem...
Citation Formats
B. D. URBAN et al., “Sooting behavior of ethanol droplet combustion at elevated pressures under microgravity conditions,” MICROGRAVITY SCIENCE AND TECHNOLOGY, pp. 12–18, 2004, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36692.
METU IIS - Integrated Information Service open@metu.edu.tr