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Viswanath R. Katta
University of Illinois at Chicago
112Publications
26H-index
1,637Citations
Publications 112
Newest
#1Fumiaki Takahashi (Case Western Reserve University)H-Index: 22
#2Viswanath R. KattaH-Index: 26
Last.Valeri I. Babushok (NIST: National Institute of Standards and Technology)H-Index: 22
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Abstract Computational studies have been performed for methane-air cup-burner (i.e., co-flow diffusion) flames with addition of phosphorous containing compounds (PCCs). The PCCs are: phosphoric acid, trimethyl phosphate (TMP), and dimethyl methylphosphonate (DMMP), and these are added to the oxidizer or fuel flow. Calculations (time-dependent) employing a 2D axisymmetric domain, detailed gas-phase chemistry and mixture-averaged diffusion, are employed to unravel the chemical inhibition and flame...
#1Viswanath R. KattaH-Index: 26
#2Kevin Y. ChoH-Index: 8
Last.William M. Roquemore (FFO: Wright-Patterson Air Force Base)H-Index: 19
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Abstract Higher fuel-burn rate and, hence, thrust from a rotating detonation engine (RDE) may be achieved through the use of larger channel widths for the annular tubes in which combustion occurs. However, while it is known that presence of solid walls influences the propagation of a detonation wave in a planar geometry, it is not clear how an increase in channel width would affect the characteristics of a rotating detonation wave in an annular tube. An experimental and numerical study is perfor...
#1Fumiaki Takahashi (Case Western Reserve University)H-Index: 22
#2Viswanath R. KattaH-Index: 26
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...
#1Salvatore Quattrocchi (UIC: University of Illinois at Chicago)H-Index: 1
#2Suresh K. Aggarwal (UIC: University of Illinois at Chicago)H-Index: 35
Last.Viswanath R. KattaH-Index: 26
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Abstract Liftoff and blowout behavior of nonpremixed syngas flames is investigated using a time-accurate CFD code with a detailed description of transport and chemistry. Lifted flames are established in coflowing laminar jets using N2 dilution in the fuel jet. Results focus on the effects of syngas composition and temperature on the liftoff, stabilization, and the edge (triple) flame structure. For a given syngas mixture, as the N2 dilution exceeds certain value, the flame lifts off from the bur...
#1Krishna C. Kalvakala (UIC: University of Illinois at Chicago)H-Index: 1
#2Suresh K. Aggarwal (UIC: University of Illinois at Chicago)H-Index: 35
Last.Viswanath R. KattaH-Index: 26
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#1Rajesh Kumar (UIC: University of Illinois at Chicago)
#2Suresh K. Aggarwal (UIC: University of Illinois at Chicago)H-Index: 35
Last.Viswanath R. KattaH-Index: 26
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#2Viswanath R. KattaH-Index: 26
Last.Suresh K. AggarwalH-Index: 35
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Abstract We have performed a computational study on the effects of oxygen enrichment 1 and fuel unsaturation on the flame structure, PAHs, soot, and NOx emissions. Counterflow flames burning ethylene, propane, and propene are simulated with CHEMKIN-Pro, using a validated mechanism with 197 species and around 5000 reactions. The stoichiometric mixture fraction (ζst) is varied by simultaneously using O2-enriched airstream and N2-diluted fuel stream such that the adiabatic flame temperature is near...
#1Fumiaki Takahashi (Case Western Reserve University)H-Index: 22
#2Viswanath R. KattaH-Index: 26
Last.Valeri I. BabushokH-Index: 22
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Abstract Computations of cup-burner flames in normal gravity have been performed using propane as the fuel to reveal the combustion inhibition and enhancement by the CF3Br (halon 1301) and potential alternative fire-extinguishing agents (C2HF5, C2HF3Cl2, and C3H2F3Br). The time-dependent, two-dimensional numerical code used includes a detailed kinetic model (up to 241 species and 3918 reactions), diffusive transport, and a gray-gas radiation model. The peak reactivity spot (i.e., reaction kernel...
#1Valeri I. Babushok (NIST: National Institute of Standards and Technology)H-Index: 22
#2Gregory T. Linteris (NIST: National Institute of Standards and Technology)H-Index: 27
Last.Fumiaki Takahashi (Case Western Reserve University)H-Index: 22
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Abstract Phosphorus-containing compounds (PCCs) have been found to be significantly more effective than CF 3 Br for reducing burning velocity when added to stoichiometric hydrocarbon-air flames. However, when added to lean flames, DMMP (dimethylmethylphosphonate) is predicted to increase the burning velocity. The addition of DMMP to lean mixtures apparently increases the equivalence ratio (fuel/oxidizer) and the combustion temperature, as a result of hydrocarbon content of DMMP molecule. Premixe...
#1Nicolas Bouvet (NIST: National Institute of Standards and Technology)H-Index: 3
#2Gregory T. Linteris (NIST: National Institute of Standards and Technology)H-Index: 27
Last.Roland KrämerH-Index: 2
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Summary The effectiveness of phosphorus-containing compounds as gas-phase combustion inhibitors varies widely with flame type. To understand this behavior, experiments are performed with dimethyl methylphosphonate (DMMP) added to the oxidizer stream of methane–air co-flow diffusion flames (cup-burner configuration). At low volume fraction, phosphorus (via DMMP addition) is shown to be about four times as effective as bromine (via Br2 addition) at reducing the amount of CO2 required for extinguis...
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