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Daniel L. Dietrich
Glenn Research Center
75Publications
13H-index
530Citations
Publications 75
Newest
Published on Sep 1, 2018in Combustion and Flame 4.49
Vedha Nayagam4
Estimated H-index: 4
(Case Western Reserve University),
Daniel L. Dietrich13
Estimated H-index: 13
(Glenn Research Center),
Forman A. Williams44
Estimated H-index: 44
(University of California, San Diego)
Abstract Millimeter-size fuel droplets burning in microgravity show substantial thermal expansion at earlier times in their burning history. Here, we develop a simple model that accounts for thermal expansion of the liquid fuel and compare it against experimental measurements. The results show that excellent agreement with measured droplet-diameter histories throughout the hot-flame period of combustion is obtained when the effect of thermal expansion is included.
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Published on Aug 1, 2018in Combustion and Flame 4.49
Vedha Nayagam11
Estimated H-index: 11
,
Daniel L. Dietrich13
Estimated H-index: 13
+ 1 AuthorsForman A. Williams44
Estimated H-index: 44
Abstract Experimental observations are presented concerning radiative extinction of large n-alkane droplets in diluent-substituted environments at moderately varied pressures in microgravity onboard the International Space Station. The fuels considered are n-heptane, n-octane, and n-decane with carbon dioxide, helium, and xenon used as inerts, replacing nitrogen as diluents at varying amounts. It is shown that a simple scaling analysis, based on the assumptions that radiative extinction occurs w...
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Published on Oct 1, 2018
Tanvir Farouk17
Estimated H-index: 17
(University of South Carolina),
Daniel L. Dietrich13
Estimated H-index: 13
(Glenn Research Center),
Frederick L. Dryer63
Estimated H-index: 63
(Princeton University)
Abstract Transient, isolated n -alkane droplet combustion is simulated at elevated pressure for helium-diluent substituted-air mixtures. We report the presence of unique quasi-steady, three-stage burning behavior of large sphero-symmetric n -alkane droplets at these elevated pressures and helium substituted ambient fractions. Upon initiation of reaction, hot-flame diffusive burning of large droplets is initiated that radiatively extinguishes to establish cool flame burning conditions in nitrogen...
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Vedha Nayagam4
Estimated H-index: 4
(Case Western Reserve University),
Daniel L. Dietrich13
Estimated H-index: 13
(Glenn Research Center),
Forman A. Williams44
Estimated H-index: 44
(University of California, San Diego)
Abstract Droplet combustion experiments carried out onboard the International Space Station, using pure fuels and fuel mixtures, have shown that quasi-steady burning can be sustained by a non-traditional flame configuration, namely a “cool flame” burning in the “partial-burning” regime where both fuel and oxygen leak through the low-temperature-controlled flame-sheet. Recent experiments involving large, bi-component fuel ( n -decane and hexanol, 50/50 by volume) droplets at elevated pressures sh...
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Published on Jul 4, 2017in Combustion Theory and Modelling 1.74
Vedha Nayagam4
Estimated H-index: 4
(Case Western Reserve University),
Daniel L. Dietrich13
Estimated H-index: 13
(Glenn Research Center),
Forman A. Williams44
Estimated H-index: 44
(University of California, San Diego)
A Burke–Schumann description of three different regimes of combustion of a fuel droplet in an oxidising atmosphere, namely the premixed-flame regime, the partial-burning regime and the diffusion-flame regime, is presented by treating the fuel and oxygen leakage fractions through the flame as known parameters. The analysis shows that the burning-rate constant, the flame-standoff ratio, and the flame temperature in these regimes can be obtained from the classical droplet-burning results by suitabl...
4 Citations Source Cite
Published on Jan 1, 2017
Tanvir Farouk17
Estimated H-index: 17
(University of South Carolina),
Daniel L. Dietrich13
Estimated H-index: 13
(Glenn Research Center)
+ 1 AuthorsFrederick L. Dryer63
Estimated H-index: 63
(Princeton University)
Abstract Observations of “ Cool Flame ” burning for large diameter isolated droplets on board the International Space Station have stimulated interest in combustion initiation/generation of non-premixed combustion modes. For a number of n -alkane fuels at large initial droplet diameters, the initiation process was observed to first establish a hot flame condition that radiatively extinguished, followed by a quasi-steady, “ Cool Flame ” droplet burning mode. However, recent large diameter n -deca...
9 Citations Source Cite
Published on Mar 4, 2017in Combustion Science and Technology 1.13
Daniel L. Dietrich13
Estimated H-index: 13
(Glenn Research Center),
R. Calabria1
Estimated H-index: 1
+ 2 AuthorsForman A. Williams44
Estimated H-index: 44
(University of California, San Diego)
ABSTRACTThis article presents the results of experiments conducted aboard the International Space Station involving the combustion of large bi-component droplets of decane and hexanol (50/50 by volume) in air ambients with ambient pressures between 0.05 and 0.30 MPa. The experiments showed the presence of sustained low-temperature or cool-flame burning following radiative extinction of large droplets at ambient pressures greater than or equal to 0.10 MPa. The droplet diameters at cool-flame exti...
3 Citations Source Cite
Published on Jan 1, 2017
Alberto Cuoci26
Estimated H-index: 26
(Polytechnic University of Milan),
Abd Essamade Saufi1
Estimated H-index: 1
(Polytechnic University of Milan)
+ 3 AuthorsTiziano Faravelli43
Estimated H-index: 43
(Polytechnic University of Milan)
Abstract A recent set of experiments carried out onboard the International Space Station (ISS) have shown that large n-alkane droplets, after the radiative extinction of the visible flame, can burn quasi-steadily in a low-temperature regime, up to a diffusive extinction accompanied by the formation of a vapor cloud. The experiments have also demonstrated that small droplets are unable to exhibit radiative extinction, but instead burn to completion or disruptively extinguish. In this work, we app...
4 Citations Source Cite
Published on Jul 10, 2016
David L. Urban2
Estimated H-index: 2
,
Daniel L. Dietrich13
Estimated H-index: 13
+ 2 AuthorsGary A. Ruff9
Estimated H-index: 9
Fire survivability depends on the detection of and response to a fire before it has produced an unacceptable environment in the vehicle. This detection time is the result of interplay between the fire burning and growth rates; the vehicle size; the detection system design; the transport time to the detector (controlled by the level of mixing in the vehicle); and the rate at which the life support system filters the atmosphere, potentially removing the detected species or particles. Given the lar...
Published on Apr 1, 2016in AIAA Journal 1.56
Vedha Nayagam11
Estimated H-index: 11
,
Daniel L. Dietrich13
Estimated H-index: 13
,
Forman A. Williams44
Estimated H-index: 44
A simplified model for droplet combustion in the partial-burning regime is applied to the cool-flame regime observed in droplet-burning experiments performed in the International Space Station with normal-alkanes fuels resulting in expressions for the quasi-steady droplet burning rate and for the flame standoff ratio. The simplified predictions are found to produce reasonable agreement with the experimentally measured values of burning-rate constants but not with their apparent dependencies on p...
9 Citations Source Cite
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