Combustion and Flame

Items from 1 to 13 out of 13 results

article

A model of the dynamics of a fluidized bed combustor burning biomass

Antonio Galgano, Piero Salatino, Silvestro Crescitelli, Fabrizio Scala, more

Combustion and Flame > 2005 > 140 > 4 > 371-384

A dynamical model of an atmospheric, bubbling, fluidized bed combustor of biomass is presented. The model, based on one previously developed for the steady combustion of high-volatile solids, accounts for the fragmentation and attrition of fuel particles, the segregation and postcombustion of volatile matter above the bed, as well as thermal feedback from the splashing region to the bed. The model...

article

Development of an algebraic reaction rate closure for the numerical calculation of turbulent premixed methane, ethylene, and propane/air flames for pressures up to 1.0 MPa

S.P. Reddy Muppala, Naresh K. Aluri, Friedrich Dinkelacker, Alfred Leipertz

Combustion and Flame > 2005 > 140 > 4 > 257-266

In this work a simplified but effective closure for the numerical simulation of turbulent premixed flames is developed, being applicable for pressures up to 1.0 MPa. Here the reaction source term of the reaction progress variable is modeled with an algebraic relation for the flame-wrinkling ratio AT/A¯. The closure is based on a three-parameter description, including an explicit pressure term. In...

article

John P. (Jack) Longwell 1918–2004

Adel F. Sarofim, Brian S. Haynes

Combustion and Flame > 2005 > 140 > 4 > 255-256

article

Emission spectroscopy of hot water vapor from H2–air deflagrative combustion in a closed cylinder

P. Chelin, C. Camy-Peyret, V. Pina, P. Alkhoury, more

Combustion and Flame > 2005 > 140 > 4 > 319-331

The water molecule is often selected as a probe of its environment to retrieve distributions of temperature and concentration in a hot gas by emission spectroscopy. A combustion chamber closed at both ends has been designed and a fast CCD camera coupled to an Ebert–Fastie spectrometer was used to experimentally validate the current spectroscopic parameters of H ₂ O at high pressures and temperatures...

article

The oxidation of benzene under conditions encountered in waste incinerators

Anke Schöbel-Ostertag, Marina Braun-Unkhoff, Claus Wahl, Lambert Krebs

Combustion and Flame > 2005 > 140 > 4 > 359-370

The oxidation of benzene was studied as a function of residence time (τres=0–2.5 s), temperature (850–960 K), and oxygen concentration (O2=0.2–2.3%) in a heated laminar flow reactor at atmospheric pressure. Nitrogen, doped with 350 ppm benzene, was injected downstream of the burned gas from a near stoichiometric flame of methane+air. Gas samples were taken at different heights up the reactor and analyzed...

article

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Combustion and Flame > 2005 > 140 > 4 > CO2

article

Effect of polymorphic phase transformations in Al2O3 film on oxidation kinetics of aluminum powders

Mikhaylo A. Trunov, Mirko Schoenitz, Xiaoying Zhu, Edward L. Dreizin

Combustion and Flame > 2005 > 140 > 4 > 310-318

Thermogravimetry was used to study the oxidation of aluminum powders at elevated temperatures. Aluminum powders of various particle sizes and surface morphologies were heated in oxygen up to 1500 °C at different heating rates. Partially oxidized samples were recovered from selected intermediate temperatures and the oxide phases present were analyzed by X-ray diffraction. The experimental data were...

article

Orbital instability and prediction of a Bunsen flame tip motion with burner rotation

Hiroshi Gotoda, Toshihisa Ueda

Combustion and Flame > 2005 > 140 > 4 > 287-298

An orbital instability of the unsteady flame tip motion with burner rotation and the possibility of the prediction of the flame tip motion are investigated from the viewpoint of nonlinear dynamics. A rich methane–air mixture of equivalence ratio 1.43 is used. The mean exit velocity from the burner tube, U, is varied from 0.6 to 1.3 m/s, keeping the swirl number S=1.14 constant. The variation in the...

article

Influence of operating conditions and the role of sulfur in the formation of aerosols from biomass combustion

S. Jiménez, J. Ballester

Combustion and Flame > 2005 > 140 > 4 > 346-358

The properties of the fine particles generated from burning biomass have been experimentally studied in a laboratory facility under a variety of combustion and postcombustion conditions; the parameters varied include combustion temperature and the concentrations of oxygen and SO ₂ in the flue gases. SO ₂ was added as a pure gas or generated in cofiring experiments. Fine particles are...

article

Combustion wave speeds of nanocomposite Al/Fe2O3: the effects of Fe2O3 particle synthesis technique

Keith B. Plantier, Michelle L. Pantoya, Alexander E. Gash

Combustion and Flame > 2005 > 140 > 4 > 299-309

Combustion wave speeds of nanoscale aluminum (Al) powders mixed with iron oxide (Fe ₂ O ₃ ) were measured as a function of Fe ₂ O ₃ synthesis technique and fuel/oxidizer composition. Three reactant synthesis techniques were examined; two focus on sol–gel processing of nanoscale Fe ₂ O ₃ particles and the third utilizes commercially available nanoscale...

article

The mechanism at the initial stage of the room-temperature oxidation of coal

Ting Shi, Xiaofang Wang, Jun Deng, Zhenyi Wen

Combustion and Flame > 2005 > 140 > 4 > 332-345

Based on eight kinds of active group obtained from experiments, novel molecular models of coal are proposed for investigating the mechanism of oxidation of coal at room temperature. The optimized geometries of simulated coal molecules and the thermodynamic data of the species were obtained by DFT-B3LYP and ONIOM methods. The mechanism of initial oxidation at room temperature for each simulated coal...

article

Co-oxidation in the auto-ignition of primary reference fuels and n-heptane/toluene blends

Johan Andrae, David Johansson, Pehr Björnbom, Per Risberg, more

Combustion and Flame > 2005 > 140 > 4 > 267-286

Auto-ignition of fuel mixtures was investigated both theoretically and experimentally to gain further understanding of the fuel chemistry. A homogeneous charge compression ignition (HCCI) engine was run under different operating conditions with fuels of different RON and MON and different chemistries. Fuels considered were primary reference fuels and toluene/n-heptane blends. The experiments were...

article

A note on chemiluminescence in low-pressure hydrogen and methane–nitrous oxide flames

Gregory P. Smith, Chung Park, Jorge Luque

Combustion and Flame > 2005 > 140 > 4 > 385-389

Absolute OH(A) and CH(A) concentrations were determined in low-pressure H ₂ –air and CH ₄ –N ₂ O flames, respectively, by measuring absolute chemiluminescence yields at 310 and 430 nm. From spatial profiles and intensities in these and other flames, we deduce that two reactions are responsible in each case, and derive rate constants for all.

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Number:
4
Volume:
140
Year:
2005

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Keywords

HIGH PRESSURE (2)
AL2O3 POLYMORPHS (1)
ALGEBRAIC CLOSURE APPROACH (1)
ALUMINUM IGNITION (1)
ALUMINUM OXIDATION (1)
AUTO-IGNITION (1)
BENZENE OXIDATION (1)
BIOMASS (1)
BIOMASS COMBUSTION (1)
BURN RATES (1)
BURNER ROTATION (1)
CHAOS (1)
CHEMKIN (1)
CHLORINE (1)
CO-OXIDATION (1)
COFIRING (1)
COMBUSTION (1)
FLAME INSTABILITY (1)
FLAME-WRINKLING RATIO (1)
FLOW REACTOR (1)
FLUIDIZED BED (1)
FUEL CHEMISTRY (1)
H2O (1)
HCCI (1)
HIGH TEMPERATURE (1)
HOMOGENEOUS CHARGE COMPRESSION IGNITION (1)
HYDROGEN (1)
METASTABLE INTERMOLECULAR COMPOSITES (1)
MODEL (1)
N-HEPTANE (1)
NANOALUMINUM COMBUSTION (1)
NONLINEAR DYNAMICS (1)
NUMERICAL MODELING (1)
OXIDATION OF COAL (1)
PREDICTION (1)
PRIMARY REFERENCE FUELS (1)
RADIATIVE TRANSFER (1)
REACTION KINETICS (1)
SO2 (1)
SOL–GEL SYNTHESIS (1)
SPECTROSCOPY (1)
SUBMICRON PARTICLES (1)
TGA (1)
THERMITES (1)
TOLUENE (1)
TURBULENT PREMIXED FLAMES (1)
UNSTEADY PREMIXED FLAME (1)
WASTE INCINERATION (1)
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