Match!

EFFECTS OF FUEL VAPOR IN AMBIENCE ON SPONTANEOUS IGNITION OF ISOLATED FUEL DROPLET

Published on Nov 30, 2009in Combustion Science and Technology1.564
· DOI :10.1080/00102200903034760
Shinji Nakaya6
Estimated H-index: 6
(OPU: Osaka Prefecture University),
Mitsuhiro Tsue3
Estimated H-index: 3
(UTokyo: University of Tokyo)
+ 4 AuthorsMichikata Kono23
Estimated H-index: 23
(UTokyo: University of Tokyo)
Abstract
Experiments have been carried out on the effects of pre-vaporized fuel in the ambience on spontaneous ignition behavior of isolated fuel droplets. An isolated droplet of n-heptane or n-dodecane, which is sustained by a quartz fiber, is inserted into a high-temperature gas field including fuel in the electric furnace. Methane and n-heptane are selected as fuels of the ambience. The ambient pressure and the temperature are set to be 0.3 MPa and 700 K, respectively, in order to prevent the consumption of methane and oxygen in the ambience. The condition of the ambience including fuel is elucidated using a numerical analysis of chemical reactions. The results indicate that the ignition delay time increases due to methane included in the ambience. In the case of the ambience where n-heptane vapor is included, both n-heptane and oxygen are consumed by chemical reactions prior to the droplet insertion. The ignition delay time of n-heptane droplet in the reacted n-heptane and air mixture is larger than that in ai...
  • References (36)
  • Citations (3)
📖 Papers frequently viewed together
2007
3 Authors (Tao Zhang, ..., Hiroshi Okada)
5 Citations
189 Citations
78% of Scinapse members use related papers. After signing in, all features are FREE.
References36
Newest
#1Mitsuhiro TsueH-Index: 17
#2Ryo IshimaruH-Index: 1
Last. Keiichi OkaiH-Index: 4
view all 6 authors...
Experiments have been carried out on the spontaneous ignition of single fuel droplets in lean fuel-air mixtures. The residence time, which is defined as the elapsed time from the introduction of the mixture into the furnace to the insertion of the droplet, is 15 s. The change in the chemical species concentration in fuel-air mixtures before the insertion of the droplet is predicted by the calculation of chemical reaction. In the case of lower ambient temperatures, the methane-air mixture does no...
5 CitationsSource
#1Alberto Cuoci (Polytechnic University of Milan)H-Index: 33
#2Marco Mehl (Polytechnic University of Milan)H-Index: 29
Last. E. Ranzi (Polytechnic University of Milan)H-Index: 8
view all 6 authors...
This paper presents a mathematical model for the unsteady evaporation, ignition, and combustion of isolated fuel droplets under microgravity. The model consists of a large structured system of differential algebraic equations, where the numerical complexity is due both to the stiff nature of the kinetic mechanism and to the flame structure around the droplet. A very general, detailed kinetic scheme, consisting of ∼200 species and over 5000 reactions, is used to describe the gas-phase combustion ...
70 CitationsSource
#1Osamu Moriue (Yamaguchi University)H-Index: 9
#2Christian Eigenbrod (University of Bremen)H-Index: 8
Last. Jun'ichi SatoH-Index: 13
view all 6 authors...
Ignition delays of a cool flame (τ1) and a hot flame (τt) were measured experimentally for single n-decane, n-dodecane, n-tetradecane and n-hexadecane droplets, which have similar volatilities to common commercial hydrocarbon fuels, in hot air. Droplet diameter was 0.7 mm. Ambient pressure was 0.3 and 1.0 MPa. Ambient temperature was 550 K to 1000 K. Results show the similarity of the examined fuels in terms of reactivity of the low- and high-temperature reactions. Values of τ1 and τt were longe...
7 CitationsSource
#1J.-R. Yang (NTHU: National Tsing Hua University)H-Index: 1
#2Shwin-Chung Wong (NTHU: National Tsing Hua University)H-Index: 17
Autoignition of n-heptane droplets under microgravity is investigated numerically. The comprehensive model, considering the transience in both the gas and liquid phases and non-ideal thermophysical properties, includes the 116-step reaction mechanism of Griffiths. Two-stage ignition manifests for ambient temperature less than 900 K at elevated pressures of 0.5 and 1.0 MPa. The predicted first delays and total delays agree well with the experimental data in the literature. The second delay decrea...
23 CitationsSource
#1Reinhard Seiser (UCSD: University of California, San Diego)H-Index: 15
#2Heinz Pitsch (UCSD: University of California, San Diego)H-Index: 55
Last. Henry J. Curran (LLNL: Lawrence Livermore National Laboratory)H-Index: 65
view all 5 authors...
A study is performed to elucidate the mechanisms of extinction and autoignition of n-heptane in strained laminar flows under nonpremixed conditions. A previously developed detailed mechanism made UP of 2540 reversible elementary reactions among 557 species is the starting point for the study. The detailed mechanism was previously used to calculate ignition delay times in homogeneous reactors, and concentration histories of a number of species in plug-flow and jet-stirred reactors. An intermediat...
221 CitationsSource
#1Daisuke Segawa (OPU: Osaka Prefecture University)H-Index: 10
#2Toshikazu Kadota (OPU: Osaka Prefecture University)H-Index: 16
Last. Hiroshi Enomoto (OPU: Osaka Prefecture University)H-Index: 4
view all 5 authors...
An experimental study has been performed under microgravity conditions to obtain the detailed information needed to understand the combustion phenomena of a fuel droplet which autoignites in supercritical gaseous environment. A fuel droplet suspended at the tip of a fine quartz fiber in the cold section of the high-pressure combustion chamber was transferred quickly to be subjected to a hot gas in an electric furnace. This resulted in the evaporation, autoignition, and combustion of the fuel dro...
8 CitationsSource
#1Stefan Schnaubelt (University of Bremen)H-Index: 3
#2Osamu Moriue (University of Bremen)H-Index: 9
Last. H.J. Rath Zarm (University of Bremen)H-Index: 1
view all 5 authors...
Detailed understanding of the basic physical and chemical processes of self-ignition phenomena for technical fuel sprays is required for many technical combustion applications. Because single droplets as the basic elements of fuel sprays allow the study of fundamental ignition behavior, this work focuses on the multistage self-ignition behavior of Φ 0.7 mm single n -heptane droplets in air. The investigated ambient conditions are temperatures from 580 to 1000 K and pressures from 0.3 to 1 MPa. A...
42 CitationsSource
#1Daisuke Segawa (OPU: Osaka Prefecture University)H-Index: 10
#2Toshikazu Kadota (OPU: Osaka Prefecture University)H-Index: 16
Last. Hiroshi Enomoto (OPU: Osaka Prefecture University)H-Index: 4
view all 4 authors...
An experimental study was made of the ignition process of single droplets of binary mixtures subjected to a laminar flat flame propagating through a lean homogeneous propane/air mixture at constant pressure. Binary fuels consisting of n -hexane and n -hexadecane or n -dodecane, and benzene and n -hexadecane were tested. Water-emulsified liquids consisting of n -dodecane, and pure fuels like n -hexane, n -octane, n -dodecane, and n -hexadecane, were used as well. A combustion chamber made of a tr...
16 CitationsSource
#1Osamu Moriue (UTokyo: University of Tokyo)H-Index: 9
#2Christian Eigenbrod (University of Bremen)H-Index: 8
Last. Michikata Kono (UTokyo: University of Tokyo)H-Index: 23
view all 7 authors...
Spontaneous ignition of isolated two-component fuel droplets has been experimentally studied. The components were n-decane (ND)/1-methylnaphthalene (MN), or ND/1,2,4-trimethylbenzene (TMB). Both are n-alkane/aromatic mixtures, and therefore are candidates for model fuels of multicomponent commercial fuels refined from crude petroleum. ND showed two-stage ignition behavior, while the other two fuels (aromatic hydrocarbons) did not and were less reactive. A suspended droplet was suddenly brought t...
30 CitationsSource
#1Anthony J. Marchese (Rowan University)H-Index: 26
#2Frederick L. Dryer (Princeton University)H-Index: 70
Last. Vedha NayagamH-Index: 12
view all 3 authors...
Transient, spherically symmetric, combustion of single and multi-component liquid n-alkane droplets is numerically simulated with a model that includes gas phase detailed, multi-component molecular transport and complex chemical kinetics. A compact semi-detailed kinetic mechanism for n-heptane and n-hexadecane oxidation consisting of 51 species (including He, Ar, and N2) and 282 reactions is used to describe the gas phase. Non-luminous, gas phase radiative heat transfer and conservation of energ...
84 CitationsSource
Cited By3
Newest
#1Inkant Awasthi (NU: University of Nebraska–Lincoln)H-Index: 2
#2Daniel N. Pope (UMN: University of Minnesota)H-Index: 9
Last. George Gogos (NU: University of Nebraska–Lincoln)H-Index: 18
view all 3 authors...
Abstract Results are presented from transient numerical simulations of combustion of an isolated heptane (n- C 7 H 16 ) droplet in nearly quiescent ambient air. The focus is on the effects of environment temperature and droplet size on the combustion characteristics. Droplet sizes range from 10 μm to 1 mm, environment temperatures range from 800 K to 1600 K, and pressure is 1 atm. The results show that ignition delay times have a very moderate dependence on droplet diameter. With an increase in ...
14 CitationsSource
#1Shinji Nakaya (OPU: Osaka Prefecture University)H-Index: 6
#2Daisuke Segawa (OPU: Osaka Prefecture University)H-Index: 10
Last. Tomoya Furuta (OPU: Osaka Prefecture University)H-Index: 1
view all 5 authors...
Abstract The burning and sooting behaviors of isolated fuel droplets for ethanol and n -decane are examined in high concentration of the ambient carbon dioxide under microgravity. A quartz fiber with the diameter of 50 μm maintains the droplet in the center of the combustion chamber and the range in the initial droplet diameter is from 0.30 to 0.80 mm. The ambience consists of oxygen, nitrogen and carbon dioxide. The concentration of oxygen is 21% in volume, and that of carbon dioxide is varied ...
6 CitationsSource
Source