2D‐Diagnostics in Industrial Devices

Arnold, A.; Bräumer, A.; Buschmann, Anke; Decker, Michael; Dinkelacker, Friedrich; Heitzmann, T.; Orth, Andreas; Schäfer, M.; Sick, Volker; Wolfrum, J.

doi:10.1002/bbpc.19930971223

Cited by 13 publications

(3 citation statements)

References 30 publications

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“…29,30 Andresen et al 31 applied this approach for qualitative NO LIF imaging in a spark-ignition gasoline engine fueled with isooctane. Arnold et al 32,33 carried out measurements in a direct-injected ͑DI͒ Diesel engine fueled with n-heptane. Ter Meulen and co-workers showed NO imaging in a prechamber-injected Diesel engine fueled with n-heptane and Diesel fuel.…”

Section: D-x͑0 1͒ Excitationmentioning

confidence: 99%

Strategies for laser-induced fluorescence detection of nitric oxide in high-pressure flames III Comparison of A–X excitation schemes

et al. 2003

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Laser-induced fluorescence (LIF) has proven a reliable technique for nitric oxide (NO) diagnostics in practical combustion systems. However, a wide variety of different excitation and detection strategies are proposed in the literature without giving clear guidelines of which strategies to use for a particular diagnostic situation. We give a brief review of the high-pressure NO LIF diagnostics literature and compare strategies for exciting selected transitions in the A-X(0, 0), (0, 1), and (0, 2) bands using a different detection bandpass. The strategies are compared in terms of NO LIF signal strength, attenuation of laser and signal light in the hot combustion gases, signal selectivity against LIF interference from O2 and CO2, and temperature and pressure sensitivity of the LIF signal. The discussion is based on spectroscopic measurements in laminar premixed methane-air flames at pressures between 1 and 60 bars and on NO and O2 LIF spectral simulations.

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Section: D-x͑0 1͒ Excitationmentioning

confidence: 99%

Strategies for laser-induced fluorescence detection of nitric oxide in high-pressure flames III Comparison of A–X excitation schemes

et al. 2003

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“…7 Using laser induced fluorescence, two dimensional concentration and temperature fields ͑2D-LIF͒ are registered by intensified high speed CCD cameras, e.g., for standard burners 8 or combustion engines. 9 The registration of background reduced concentration fields by LIF demands two excitation wavelengths, one of them on-resonance on the absorption transition of the gas, and the other one off-resonance in an absorption free spectral region. The determination of the temperature of combustion gases by 2D-LIF is based on the excitation of different vibrational rotational or spin state levels of the molecular electronic ground state with different temperature dependencies.…”

Section: Introductionmentioning

confidence: 99%

Fast wavelength switching of narrow-band excimer lasers

Grebner

Müller

Triebel

1997

Review of Scientific Instruments

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A novel system was developed, which allows one to switch the wavelength of a narrow-band excimer laser between two successive light pulses at a repetition rate of at least 250 Hz. This is realized by a periodically driven piezo actuator, which is attached to the diffraction grating of the narrow-band KrF excimer laser. The achieved position accuracy of the grating leads to a wavelength reproducibility of Ϯ0.2 pm, which allows one to apply this system to laser spectroscopic investigations like LIF or LIPF of OH in flames. Using the fast wavelength switching system background reduced concentration and temperature fields in flames can be measured within one sequence. Some possible realized and planned applications like the measurement of gas temperature, the diagnostic of turbulent combustion processes, and the investigation of combustion processes under microgravity are discussed.

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“…While multidimensional laser sheet techniques gained increased popularity during the last years [1,2], there is still a challenge for further development of these techniques. One task will be to perform more quantitative measurements, while another one will be to apply the techniques to environments not yet studied.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous 2D single-shot imaging of oh concentrations and temperature fields in an si engine simulator

Orth

Sick

Wolfrum

et al. 1994

Symposium (International) on Combustion

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Two-dimensional (2D) temperature measurements in engines are required for the detailed understanding of the combustion process. Because of the unsteady and turbulent nature of engine combustion, these measurements must be performed on a single-shot basis to obtain cycle-resolved results. Details of the flame front structure are also important to know for the numerical modeling of internal combustion processes. Simultaneous measurements of temperature and hydroxyl radical distributions provide such data sets. The combustion of methane in a fully transparent square piston engine was studied with a combination of 2D laser-induced fluorescence of hydroxyl radicals and 2D Rayleigh scattering. A tunable KrF excimer laser at 248 nm was used for the measurements. The wavelength of the laser was tuned to excite the P2(8) transition in the OH (3,0) band of the AX system. Spectral filtering of the resulting fluorescence to detect solely the fluorescence from the (3,2) band significantly reduces the effect of collisional quenching imposed to the fluorescence of the predissociating v' = 3 level by vibrational energy transfer (VET) to lower vibrational levels. Using a second camera, which only records the Rayleigh signals after appropriate filtering, allows the simultaneous measurement of temperature fields with a single laser. The analysis of corresponding OH and temperature images allowed the decision that the combustion conditions are in a regime where the flamelet approach for modeling is appropriate. Good agreement with model predictions has been achieved for the peak temperatures.

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2D‐Diagnostics in Industrial Devices

Cited by 13 publications

References 30 publications

Strategies for laser-induced fluorescence detection of nitric oxide in high-pressure flames III Comparison of A–X excitation schemes

Strategies for laser-induced fluorescence detection of nitric oxide in high-pressure flames III Comparison of A–X excitation schemes

Fast wavelength switching of narrow-band excimer lasers

Simultaneous 2D single-shot imaging of oh concentrations and temperature fields in an si engine simulator

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