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Microgravity experiments on flame spread along fuel-droplet arrays using a new droplet-generation technique

Published on May 1, 2005in Combustion and Flame4.12
· DOI :10.1016/j.combustflame.2005.01.007
Masato Mikami14
Estimated H-index: 14
(Yamaguchi University),
Hiroshi Oyagi3
Estimated H-index: 3
(Yamaguchi University)
+ 3 AuthorsShinichi Yoda21
Estimated H-index: 21
(JAXA: Japan Aerospace Exploration Agency)
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Abstract
Abstract A new droplet-array generation technique achieved high quality and high reliability in microgravity experiments on multiple-droplet combustion. Each fuel droplet formed at the intersection of fine, X-shaped SiC fibers when liquid fuel was supplied through a fine glass tube. We aligned several sets of these X-shaped fibers and their corresponding fine glass tubes to form a droplet array. All the droplets in the array were simultaneously generated in a short time. In flame-spread experiments, a hot-wire igniter ignited an end droplet to initiate the flame spread along the array. We demonstrated microgravity experiments of droplet array combustion using the new droplet-array generation technique at a drop-experiment facility, MGLAB, in Japan. We successfully generated large droplets, which often fell off the fiber intersection in normal gravity, by using this method in microgravity. This technique is also effective in droplet-array combustion experiments using high-volatility fuel, where prevaporization is substantial. We compared the flame-spread rate and the flame-spread limit of these linear droplet arrays with results of an existing experiment, and discussed the effects of the suspending fiber on the flame spread.
  • References (6)
  • Citations (37)
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References6
Newest
Published on Nov 1, 2000in Journal of Propulsion and Power1.80
C. Thomas Avedisian14
Estimated H-index: 14
,
Gregory S. Jackson1
Estimated H-index: 1
Thetrappingandtransportofsootaggregatesbetweenaburningsuspendeddropletanditse ameinaconvectionfree (microgravity ) environment are discussed. Many researchers have utilized the suspended droplet method for studying droplet combustion in microgravity where the intentis to createa spherically symmetric burning process. In the ideal case, soot particles are trapped in a spherical shell-like structure between the droplet and the e ame. Resultspresented showthatthee bersupport canpreventtheformation ...
Published on Jun 1, 1998in Combustion and Flame4.12
I. Aharon1
Estimated H-index: 1
(UC Davis: University of California, Davis),
B.D. Shaw2
Estimated H-index: 2
(UC Davis: University of California, Davis)
Abstract Experiments on combustion of heptane/hexadecane mixture droplets were conducted in a reduced-gravity environment. Initial droplet diameters ranged from 0.47 to 1.5 mm, and initial hexadecane mass fractions ranged from 0.05 to 0.4. The ambient gas was O 2 /He (with O 2 mole fractions of 0.3 and 0.5), or atmospheric air, and pressures were varied from 0.033 to 0.3 MPa (abs). A previous asymptotic theory was extended to allow data on flame contractions to be used to estimate liquid species...
Published on Aug 1, 1995in Combustion and Flame4.12
Ann T. Shih3
Estimated H-index: 3
(UIC: University of Illinois at Chicago),
Constantine M. Megaridis37
Estimated H-index: 37
(UIC: University of Illinois at Chicago)
A detailed numerical model is used to analyze the evaporation characteristics of a fuel droplet which is suspended concentrically from a spherical bead born at the tip of a thin cylindrical filament. The suspended droplet is exposed to a high-temperature, laminar, gaseous stream with a relevant Reynolds number Re ∼ 50. The model solves the time-dependent axisymmetric Navier-Stokes and energy equations in both fluid phases, in conjunction with the heat conduction equation within the suspender mat...
Published on Nov 1, 1990in Combustion and Flame4.12
Jun'ichi Sato10
Estimated H-index: 10
,
Mitsuhiro Tsue15
Estimated H-index: 15
(UTokyo: University of Tokyo)
+ 1 AuthorsMichikata Kono16
Estimated H-index: 16
(UTokyo: University of Tokyo)
Abstract Burning behavior of a suspended fuel droplet under both normal and microgravity fields has been studied experimentally to explore the effects of natural convection at high ambient pressure levels up to four times the fuel critical pressure. The fuel employed was n -octane. Experiments have shown that the burning rate constant increases with the increase of the ambient pressure at subcritical pressures and decreases at supercritical pressures for both microgravity and normal gravity fiel...
Cited By37
Newest
Published on Jan 1, 2019
Yasuko Yoshida1
Estimated H-index: 1
(Yamaguchi University),
Kentaro Iwai (Yamaguchi University)+ 7 AuthorsMasaki Nokura1
Estimated H-index: 1
Abstract This research conducted microgravity experiments on the flame spread over droplet-cloud elements with strong droplet interaction aboard Kibo on the ISS. The droplet-cloud element represents a local droplet pattern appearing in randomly distributed droplet clouds near the group-combustion-excitation limit and consists of small-droplet-spacing droplets and large-droplet-spacing droplets. As droplet-cloud elements, we used four n -decane droplets, Droplets C, B, A and L, placed at fiber in...
Published on Jan 1, 2019in International Journal of Heat and Mass Transfer4.35
Christian Chauveau21
Estimated H-index: 21
(CNRS: Centre national de la recherche scientifique),
Madjid Birouk16
Estimated H-index: 16
(UM: University of Manitoba)
+ 1 AuthorsIskender Gökalp30
Estimated H-index: 30
(CNRS: Centre national de la recherche scientifique)
Abstract This paper presents an analysis of the effect of the droplet support fiber on the droplet evaporation process. This effect is evaluated for a droplet evaporating in a hot environment at atmospheric pressure using the experimental results of the present study and those in the literature. Selected published results are acquired using similar test conditions and experimental setups as the present data. The only main difference between these studies is the droplet support fiber diameter whi...
Published on Aug 1, 2018in Microgravity Science and Technology1.97
Masato Mikami14
Estimated H-index: 14
(Yamaguchi University),
Yasuko Yoshida1
Estimated H-index: 1
(Yamaguchi University)
+ 4 AuthorsMasaki Nokura1
Estimated H-index: 1
This research conducted microgravity experiments on the flame spread over randomly distributed n-decane-droplet clouds aboard the Japanese Experiment Module “Kibo” on the International Space Station. 67-152 droplets were distributed at intersections of a 30 × 30 square lattice with 14-micron SiC fibers placed in a combustion chamber. One droplet on the bottom side of lattice was ignited by a hot-wire igniter to start the flame spread. The burning behavior was observed by a digital camera. This p...
Published on Aug 1, 2018in Microgravity Science and Technology1.97
Masato Mikami14
Estimated H-index: 14
(Yamaguchi University),
Herman Saputro2
Estimated H-index: 2
(UNS: Sebelas Maret University)
+ 1 AuthorsHiroshi Oyagi3
Estimated H-index: 3
(Yamaguchi University)
Stable operation of liquid-fueled combustors requires the group combustion of fuel spray. Our study employs a percolation approach to describe unsteady group-combustion excitation based on findings obtained from microgravity experiments on the flame spread of fuel droplets. We focus on droplet clouds distributed randomly in three-dimensional square lattices with a low-volatility fuel, such as n-decane in room-temperature air, where the pre-vaporization effect is negligible. We also focus on the ...
Published on Jul 1, 2018in Combustion and Flame4.12
Masato Mikami14
Estimated H-index: 14
(Yamaguchi University),
Naoya Motomatsu1
Estimated H-index: 1
(Yamaguchi University)
+ 2 AuthorsTakehiko Seo4
Estimated H-index: 4
(Yamaguchi University)
Abstract This research investigates the flame-spread characteristics between two droplets, Droplets A and L, of different diameter. n -Decane droplets are placed at intersections of 14 µ SiC fibers. The flame spread from Droplet A to Droplet L was observed in microgravity. The results show that the flame-spread rate decreases with an increase in the droplet spacing or the initial diameter of Droplet L for a constant initial diameter of Droplet A. The flame-spread time is approximated as the summ...
Published on Aug 1, 2017in Combustion and Flame4.12
Cameron Verwey2
Estimated H-index: 2
(UM: University of Manitoba),
Madjid Birouk16
Estimated H-index: 16
(UM: University of Manitoba)
Abstract This paper presents the results of an experimental investigation of the effect of droplet size on the fuel vaporization process in a turbulent atmosphere at standard ambient conditions. Single droplets of n-heptane and n-decane are formed and evaporated at the intersection point of two micro-fibers placed in the center of a fan-stirred spherical vessel which is maintained at room temperature and pressure. The droplet initial diameter varies in the range between 145 and 730 µm. A control...
Published on Jan 1, 2017in Journal of Thermal Science and Technology0.69
Masato Mikami14
Estimated H-index: 14
(Yamaguchi University),
Hidetaka Watari1
Estimated H-index: 1
(Yamaguchi University)
+ 4 AuthorsMasao Kikuchi7
Estimated H-index: 7
(JAXA: Japan Aerospace Exploration Agency)
Yusuke Suganuma4
Estimated H-index: 4
(College of Industrial Technology),
Noriyuki Ikeyama (Nihon University)+ 1 AuthorsYasushige Ujiie7
Estimated H-index: 7
(College of Industrial Technology)
Published on May 1, 2015in Physics of Fluids2.63
Jaeheon Sim4
Estimated H-index: 4
(KAUST: King Abdullah University of Science and Technology),
Hong G. Im25
Estimated H-index: 25
(KAUST: King Abdullah University of Science and Technology),
Suk Ho Chung40
Estimated H-index: 40
(KAUST: King Abdullah University of Science and Technology)
Droplet evaporation by a localized heat source under microgravity conditions was numerically investigated in an attempt to understand the mechanism of the fuel vapor jet ejection, which was observed experimentally during the flame spread through a droplet array. An Eulerian-Lagrangian method was implemented with a temperature-dependent surface tension model and a local phase change model in order to effectively capture the interfacial dynamics between liquid droplet and surrounding air. It was f...
View next paperMicrogravity experiments on flame spread along fuel-droplet arrays at high temperatures