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K. Seshadri
University of California, San Diego
103Publications
28H-index
3,486Citations
Publications 103
Newest
#1Yuanjie Jiang (UCSD: University of California, San Diego)
Last.Forman A. Williams (UCSD: University of California, San Diego)H-Index: 48
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Abstract The aim of this study is to eliminate unimportant steps from a detailed chemical-kinetic mechanism in order to identify a skeletal kinetic mechanism that can predict with sufficient accuracy ignition delay times and laminar premixed-flame velocities for H 2 - C H 4 mixtures under conditions of practical interest in gas-turbine applications, which pertain to high pressure, high reactant temperature, and primarily lean-to-stoichiometric mixture compositions (although somewhat rich conditi...
#1Gerald Mairinger (UCSD: University of California, San Diego)H-Index: 2
#2Rohit Sanjay Khare (Indian Institute of Technology Madras)
Last.K. Seshadri (UCSD: University of California, San Diego)H-Index: 28
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Experimental and computational investigation is carried out to elucidate the influence of stoichiometric mixture fraction, ξst, on the structure and critical conditions of extinction of nonpremixed dimethyl ether (DME) flames. The stoichiometric mixture fraction represents the location of a thin reaction zone in terms of a conserved scalar quantity. The counterflow configuration is employed, wherein two reactant streams flow towards a stagnation plane. One stream is made up of DME and nitrogen (...
#1Gerald Mairinger (UCSD: University of California, San Diego)H-Index: 2
#2Alessio Frassoldati (Polytechnic University of Milan)H-Index: 34
Last.K. Seshadri (UCSD: University of California, San Diego)H-Index: 28
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Abstract Experimental and computational investigations are carried out to elucidate the fundamental mechanisms of autoignition of surrogates of jet-fuels at elevated pressures up to 6 bar. The jet-fuels tested are JP-8, Jet-A, and JP-5, and the surrogates tested are the Aachen Surrogate made up of 80 % n- decane and 20 % 1,3,5-trimethylbenzene by mass, Surrogate C made up of 60 % n- dodecane, 20 % methylcyclohexane and 20 % o- xylene by volume, and the 2nd generation Princeton Surrogate made up ...
#1Yuanjie Jiang (UCSD: University of California, San Diego)
#2Ryan K. Gehmlich (UCSD: University of California, San Diego)H-Index: 4
Last.K. Seshadri (UCSD: University of California, San Diego)H-Index: 28
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Abstract Experimental and computational studies are carried out to elucidate the structure and extinction of laminar partially-premixed flames employing the counterflow configuration. The fuel is methoxymethane (DME). The formulation considers two laminar streams that flow toward a stagnation plane. One stream called the fuel-rich stream is made up of DME (CH 3 OCH 3 ), and nitrogen (N 2 ) with small amounts of oxygen (O 2 ) and the other stream called the fuel-lean stream is made up of O 2 , an...
#1Philipp Mairhofer (UCSD: University of California, San Diego)H-Index: 1
#2Gerald Mairinger (UCSD: University of California, San Diego)H-Index: 2
Last.E. Pucher (TU Wien: Vienna University of Technology)H-Index: 5
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Activation energy asymptotic analysis and rate-ratio asymptotic analysis of combustion in laminar, nonpremixed flames are often carried out using conserved scalar quantities as independent variables. One such representation of a conserved scalar quantity is the mixture fraction, ξ, based on thermal diffusivity. These analyses are carried out in the asymptotic limit of large Damkohler number, with chemical reactions presumed to take place in a thin reaction zone that is located at ξ=ξst. The quan...
#1K. SeshadriH-Index: 28
#2Xue-Song BaiH-Index: 28
Rate-ratio asymptotic (RRA) analysis is carried out to elucidate the influence of carbon monoxide on the structure and critical conditions of extinction of nonpremixed methane flames. Steady, axisymmetric, laminar flow of two counterflowing streams toward a stagnation plane is considered. One stream, called the fuel-stream is made up of a mixture of methane (CH4) and nitrogen (N2). The other stream, called the oxidizer-stream, is a mixture of oxygen (O2), carbon monoxide (CO) and N2. Chemical re...
#1K. Seshadri (UCSD: University of California, San Diego)H-Index: 28
#2Xue-Song Bai (Lund University)H-Index: 28
Rate-ratio asymptotic (RRA) analysis is carried out to elucidate the influence of carbon monoxide on the structure and critical conditions of extinction of nonpremixed methane flames. Steady, axisymmetric, laminar flow of two counterflowing streams toward a stagnation plane is considered. One stream, called the fuel stream is made up of a mixture of methane (CH4) and nitrogen (N2). The other stream, called the oxidizer stream, is a mixture of oxygen (O2), and N2. Carbon monoxide (CO) is added ei...
#1Gerald Mairinger (UCSD: University of California, San Diego)H-Index: 2
#2Alessio Frassoldati (Polytechnic University of Milan)H-Index: 34
Last.K. Seshadri (UCSD: University of California, San Diego)H-Index: 28
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Experimental and computational investigation is carried out to elucidate the fundamental mechanism of autoignition of n-heptane, n-decane, and n-dodecane in non-premixed flows at elevated pressures up to 6 bar. The counterflow configuration is employed. In this configuration, an axisymmetric flow of a gaseous oxidizer stream is directed over the surface of an evaporating pool of liquid fuel. The oxidizer stream is a mixture of oxygen and nitrogen. The experiments are conducted at a fixed value o...
#1K. Seshadri (UCSD: University of California, San Diego)H-Index: 28
#2N. Peters (RWTH Aachen University)H-Index: 56
Last.Guenter Paczko (RWTH Aachen University)H-Index: 2
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A skeletal chemical-kinetic mechanism for n-heptane cool flames is simplified to the maximum extent possible by introduction of steady-state approximations for intermediaries, following procedures employed previously in addressing two-stage ignition. A pair of ordinary differential equations in mixture-fraction space is thereby obtained, describing the quasi-steady structures of the temperature and heptylketohydroperoxide fields. Application of activation-energy asymptotics for the partial-burni...
#1Philipp MairhoferH-Index: 1
#2K. SeshadriH-Index: 28
Last.E. PucherH-Index: 5
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Fundamental studies on combustion in laminar, nonpremixed flames are often carried out using conserved scalar quantities. These conserved scalar quantities, represented here by mixture fraction, E, are used as independent variables in activation-energy asymptotic analysis and in rate-ratio asymptotic analysis. These analyses are carried out in the asymptotic limit of large Damkohler number, with chemical reactions presumed to take place in a thin reaction zone, that is located at E = Est. The qu...
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