TY - JOUR
T1 - Effects of dilution by aromatic hydrocarbons on staged ignition behavior of n-decane droplets
AU - Moriue, O.
AU - Eigenbrod, C.
AU - Rath, H. J.
AU - Sato, J.
AU - Okai, K.
AU - Tsue, M.
AU - Kono, M.
N1 - Funding Information:
This work was carried out within the framework of an international cooperation between Germany and Japan. It was supported by the Deutsches Forschungszentrum für Luft-und Raumfahrt under the contract 50WM9448, and it was performed under the management of the JSUP (Japan Space Utilization Promotion Center) as a part of an R&D project concerning basic research on high-temperature air combustion technology, supported by the New Energy and Industrial Technology Development Organization.
PY - 2000
Y1 - 2000
N2 - 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 to a high temperature for ignition. Observation by a Michelson interferometer detected cool-flame appearance as well as hot-flame appearance. The ambient gas was air, and the droplet diameter was 0.7 mm. The experimental conditions that were varied were ambient temperature, Ta, (500-1000 K), ambient pressure, Pa, (0.1-2.0 MPa), and the initial mole fraction of ND in the liquid phase, Z (0-1). In the case Z ≠ 1, Pa was fixed to 0.3 MPa. Ignition delays for cool-flame and hot-flame appearance (t1 and ttot) and the difference between them (t2) were measured, and ignition types (no ignition, cool-flame only, singlestage ignition, and two-stage ignition) were classified on a "Z-Ta" map. It is common to ND/MN and ND/TMB that two-stage ignition region is narrowed and finally vanishes as Z decreases, and that t1, t2, and ttot all increase monotonically as Z decreases. However, TMB was affected more than MN because of its higher volatility. (Normal boiling point: ND 447.3 K, MN 517.9 K, TMB 442.5 K) Numerical simulation with a fully transient one-dimensional model was employed to help the interpretation.
AB - 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 to a high temperature for ignition. Observation by a Michelson interferometer detected cool-flame appearance as well as hot-flame appearance. The ambient gas was air, and the droplet diameter was 0.7 mm. The experimental conditions that were varied were ambient temperature, Ta, (500-1000 K), ambient pressure, Pa, (0.1-2.0 MPa), and the initial mole fraction of ND in the liquid phase, Z (0-1). In the case Z ≠ 1, Pa was fixed to 0.3 MPa. Ignition delays for cool-flame and hot-flame appearance (t1 and ttot) and the difference between them (t2) were measured, and ignition types (no ignition, cool-flame only, singlestage ignition, and two-stage ignition) were classified on a "Z-Ta" map. It is common to ND/MN and ND/TMB that two-stage ignition region is narrowed and finally vanishes as Z decreases, and that t1, t2, and ttot all increase monotonically as Z decreases. However, TMB was affected more than MN because of its higher volatility. (Normal boiling point: ND 447.3 K, MN 517.9 K, TMB 442.5 K) Numerical simulation with a fully transient one-dimensional model was employed to help the interpretation.
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U2 - 10.1016/S0082-0784(00)80303-3
DO - 10.1016/S0082-0784(00)80303-3
M3 - Conference article
AN - SCOPUS:84915784370
VL - 28
SP - 969
EP - 975
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
SN - 1540-7489
IS - 1
T2 - 30th International Symposium on Combustion
Y2 - 25 July 2004 through 30 July 2004
ER -