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Michael C. Hicks
Glenn Research Center
43Publications
8H-index
275Citations
Publications 43
Newest
#1Sivamohan N. Reddy (IITR: Indian Institute of Technology Roorkee)H-Index: 11
#2Sonil Nanda (UWO: University of Western Ontario)H-Index: 3
Last.Janusz A. Kozinski (UW: University of Waterloo)H-Index: 1
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Abstract Hydrothermal flame is produced in an aqueous environment beyond the thermodynamic critical properties of water. It is an interface developed at the contact of oxidant and fuel in supercritical water and depends on the operating parameters. In-situ diffusion-limited hydrothermal flames were generated in a novel supercritical flame reactor designed by the National Aeronautics and Space Administration (NASA) at Glenn Research Center to investigate the impacts of oxidant flow rate and tempe...
#1Michael C. Hicks (Glenn Research Center)H-Index: 8
#2U.G. Hegde (Case Western Reserve University)
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Abstract Results on the autoignition and stabilization of ethanol hydrothermal flames in a Supercritical Water Oxidation (SCWO) reactor operating at constant pressure are reported. The flames are observed as luminous reaction zones occurring in supercritical water; i.e., water at conditions above its critical point (approximately 22 MPa and 374 °C). A co-flow injector is used to inject fuel (inner flow), comprising an aqueous solution ranging from 20%-v to 50%-v ethanol, and air (annular flow) i...
#1Vedha Nayagam (Case Western Reserve University)H-Index: 4
#2Daniel L. Dietrich (Glenn Research Center)H-Index: 13
Last.Forman A. Williams (UCSD: University of California, San Diego)H-Index: 48
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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...
#1Fumiaki Takahashi (Case Western Reserve University)H-Index: 22
#2Viswanath R. KattaH-Index: 25
Last.Michael C. Hicks (Glenn Research Center)H-Index: 8
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The two-stage combustion, local extinction, and flame-edge oscillations have been observed in single-droplet combustion tests conducted on the International Space Station. To understand such dynamic behavior of initially enveloped diffusion flames in microgravity, two-dimensional (axisymmetric) computation is performed for a gaseous n-heptane flame using a time-dependent code with a detailed reaction mechanism (127 species and 1130 reactions), diffusive transport, and a simple radiation model (f...
This paper is concerned with the study of autoignition of fully developed free round turbulent jets consisting of oxidizing and chemically reacting components. We derive an elementary, still experimentally feasible, model for autoignition of such jets and present analysis of this model. The derivation of the model is based on the well-established experimental fact that the fully developed free round turbulent jets, in a first approximation, have the shape of a conical frustum. Moreover, the velo...
#1Sivamohan N. Reddy (IITR: Indian Institute of Technology Roorkee)H-Index: 11
#2Sonil Nanda (York University)H-Index: 8
Last.Janusz A. Kozinski (York University)H-Index: 31
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Abstract A novel concept was applied for the in situ study of the ignition of n -propanol–air hydrothermal flames during supercritical water oxidation. An innovative experimental arrangement including NASA's supercritical water oxidation facility was used to study the effect of reactor and oxidant (air) temperature on the spontaneous ignition of hydrothermal flames. New data were obtained concerning time- and temperature-resolved profiles of n -propanol in hydrothermal flames. Transient temperat...
#1Yuhao Xu (Cornell University)H-Index: 7
#2Michael C. Hicks (Glenn Research Center)H-Index: 8
Last.C. Thomas Avedisian (Cornell University)H-Index: 14
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Abstract The burning characteristics of iso -octane droplets in the standard atmosphere are reported over a large range of initial droplet diameters (0.5 mm D o 5 mm) for near one-dimensional droplet flames as promoted by low gravity. A ground-based drop tower and a space-based platform (International Space Station) were used to provide an environment to examine the influence of D o that encompasses regimes where radiation does not have an effect on burning to where it does. For D o K ) was near...
This paper is concerned with the derivation and mathematical analysis of a model for autoignition of laminar co-flow jets. Such jets consist of two parts: an inner part with oxidizer that is surrounded by an outer part with fuel, or the reverse. To derive a model we use a combination of Burke--Schumann theory of diffusion flames and Semenov--Frank-Kamenerskii theory of thermal explosion. The main advantage of our model is that it gives a well-defined condition for autoignition of a jet. We provi...
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