Dual-Pump CARS Measurements of Temperature and Oxygen in a Turbulent Methanol-Fueled Pool Fire

Frederickson, Kraig; Kearney, Sean P.; Luketa, Anay; Hewson, John C.; Grasser, Thomas W.

doi:10.1080/00102200903463704

Cited by 19 publications

(8 citation statements)

References 31 publications

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“…Hancock et al [24] measured temperature and O 2 concentration in a laminar jet flame using CARS. Frederickson et al [25] measured temperature and O 2 concentrations in a turbulent pool fire. Both groups found that the CARSFT model overestimated O 2 concentrations at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Dual-pump vibrational CARS measurements of temperature and species concentrations in turbulent premixed flames with CO2 addition

Han

Satija

Kim

et al. 2017

Combustion and Flame

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a b s t r a c tA dual-pump vibrational coherent anti-Stokes Raman scattering (DPVCARS) system was applied for simultaneous temperature and species concentration measurements in jet flames on a newly developed piloted axisymmetric reactor assisted turbulent (PARAT) premixed flame burner. Turbulent lean premixed methane/air round jet flames with varying CO 2 dilution were stabilized using an annular flow of hydrogen at the flame base. Carbon dioxide was injected into the fuel stream to simulate effects of dry exhaust gas recirculation (EGR). The flames were operated at a nearly constant Reynolds number, Lewis number, and adiabatic flame temperature to minimize thermal and transport effects. Velocity boundary conditions at the burner exit were measured using particle image velocimetry. Simultaneous temperature and major species concentrations (O 2 and CO 2 ) were measured along the axial direction at the burner centerline and along the radial direction at representative axial locations above the burner. Progress variables calculated based on the temperatures were used to study the mean flame brush thickness and the turbulent burning velocity. Probability density functions (PDFs) of temperature at various locations are presented and discussed. The DPVCARS measurements provide an experimental database including temperature and turbulent burning velocity for combustion model evaluation and validation and demonstrated a strong potential for flame structure investigation with future improvement on spatial resolution and signal to noise ratio. The merits and limitations of vibrational CARS for diagnostics in turbulent premixed combustion are discussed. The results show that flames with CO 2 addition depart from the universal mean flame brush structure, while their RMS fluctuation values at an identical mean temperature collapse with the undiluted flame. The CO 2 addition increases the combustion intensity with a decrease in turbulent burning velocity when minimizing the thermal and transport effects.

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Section: Introductionmentioning

confidence: 99%

Dual-pump vibrational CARS measurements of temperature and species concentrations in turbulent premixed flames with CO2 addition

Han

Satija

Kim

et al. 2017

Combustion and Flame

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“…A key advantage of these optical techniques is the ability to monitor multiple parameters simultaneously. Coherent anti-Stokes Raman scattering (CARS) is a particularly attractive spectroscopic tool for simultaneous monitoring of temperature and species concentrations in combustion [1][2][3][4][5][6]. CARS pressure measurements have also been demonstrated in compressible flow fields, but pressure monitoring has received comparatively less attention.…”

Section: Introductionmentioning

confidence: 99%

Pressure Monitoring Using Hybrid fs/ps Rotational CARS

Kearney

Danehy

2015

53rd AIAA Aerospace Sciences Meeting

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We investigate the feasibility of gas-phase pressure measurements at kHz-rates using fs/ps rotational CARS. Femtosecond pump and Stokes pulses impulsively prepare a rotational Raman coherence, which is then probed by a high-energy 6-ps pulse introduced at a time delay from the Raman preparation. Rotational CARS spectra were recorded in N 2 contained in a room-temperature gas cell for pressures from 0.1 to 3 atm and probe delays ranging from 10-330 ps. Using published self-broadened collisional linewidth data for N 2 , both the spectrally integrated coherence decay rate and the spectrally resolved decay were investigated as means for detecting pressure. Shot-averaged and single-laser-shot spectra were interrogated for pressure and the accuracy and precision as a function of probe delay and cell pressure are discussed. Single-shot measurement accuracies were within 0.1 to 6.5% when compared to a transducer values, while the precision was generally between 1% and 6% of measured pressure for probe delays of 200 ps or more, and better than 2% as the delay approached 300 ps. A byproduct of the pressure measurement is an independent but simultaneous measurement of the gas temperature.

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“…Laser and optical diagnostics can overcome these disadvantages, but are additionally challenged by optical background arising from soot luminosity, scattering and absorption, and by heat transfer to the optical setups. Nevertheless, optical techniques have been successfully applied to sooting turbulent flames for spatially and temporally resolved measurements [3,4], and have recently been applied to meterscale turbulent pool fires for temperature and soot field evaluation [5][6][7][8] at the Sandia FLAME facility.…”

Section: Introductionmentioning

confidence: 99%

Temperature, Oxygen, and Soot-Volume-Fraction Measurements in a Turbulent C<sub>2</sub>H<sub>4</sub>-Fueled Jet Flame

Kearney

Guildenbecher

Winters

et al. 2015

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We present a detailed set of measurements from a piloted, sooting, turbulent C 2 H 4fueled diffusion flame. Hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (CARS) is used to monitor temperature and oxygen, while laser-induced incandescence (LII) is applied for imaging of the soot volume fraction in the challenging jet-flame environment at Reynolds number, Re = 20,000. Single-laser shot results are used to map the mean and rms statistics, as well as probability densities. LII data from the soot-growth region of the flame are used to benchmark the soot source term for one-dimensional turbulence (ODT) modeling of this turbulent flame. The ODT code is then used to predict temperature and oxygen fluctuations higher in the soot oxidation region higher in the flame.

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Dual-Pump CARS Measurements of Temperature and Oxygen in a Turbulent Methanol-Fueled Pool Fire

Cited by 19 publications

References 31 publications

Dual-pump vibrational CARS measurements of temperature and species concentrations in turbulent premixed flames with CO2 addition

Dual-pump vibrational CARS measurements of temperature and species concentrations in turbulent premixed flames with CO2 addition

Pressure Monitoring Using Hybrid fs/ps Rotational CARS

Temperature, Oxygen, and Soot-Volume-Fraction Measurements in a Turbulent C<sub>2</sub>H<sub>4</sub>-Fueled Jet Flame

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