In-Cylinder Measurements of NO Formation in a Diesel Engine

Stoffels, Genie G.M.; Boom, E. J. van den; Spaanjaars, C. M. I.; Dam, NJ Nico; Meerts, W. Leo; Meulen, J. J. ter; Duff, J. L. C.; Rickeard, David J.

doi:10.4271/1999-01-1487

Cited by 10 publications

(4 citation statements)

References 26 publications

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“…Andersen et al 31 reported complete laser absorption in the cylinder after ignition to crank angles as late as 150 deg after top dead center, when pressure has dropped from the maximum of 30 bar to below approximately 5 bar. Stoffels et al 37 observed transmissions of 0 -1.2% through the 82-mmdiameter cylinder for all investigated crank angles between Ϫ20 and 100 deg relative to top dead center. Techniques that were developed to correct for the laser attenuation 35 are based the questionable assumption that attenuation is caused by light scattering only.…”

Section: D-x͑0 1͒ Excitationmentioning

confidence: 88%

“…34,35 They subsequently performed measurements in a DI Diesel engine with maximum pressures of 75 bar. 36,37 Tanaka et al performed measurements in a spark-ignition engine. 38 In most of the research, the ArF excimer laser was tuned to the D-X͑0, 1͒ R 1 ͑26.5͒ ϩ Q 1 ͑32.5͒ transition at 193.38 nm with subsequent detection of D-X͑0, 3͒ emission around 208 nm.…”

Section: D-x͑0 1͒ Excitationmentioning

confidence: 99%

“…Interpretation of the LIF signals is further complicated by the fact that little is known about quenching and electronic energy-transfer processes of the NO D state. Attempts for absolute interpretation 36,37 must rely on unverified assumptions about the dependence of fluorescence quantum yield on pressure and temperature.…”

Section: D-x͑0 1͒ Excitationmentioning

confidence: 99%

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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: 88%

Section: D-x͑0 1͒ Excitationmentioning

confidence: 99%

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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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“…Although the LIF technique has often been applied for NO measurements in diesel engines [1][2][3][4][5][6][7], the severe attenuation of the laser beam and the induced fluorescence is not always properly addressed. Exceptions are Stoffels et al [4], who measured spatially resolved laser beam transmission (although no correction was made for the attenuation of the NO fluorescence), and Hildenbrand et al [7], who corrected for the absorption of NO fluorescence by CO 2 (but neglecting additional LIF attenuation caused by, e.g., soot, and lacking a correction for laser beam attenuation). Recently we investigated a number of attenuation correction methods, the combination of which yields a complete picture of all major attenuation processes involved in NO LIF measurements in a diesel engine [8].…”

Section: Introductionmentioning

confidence: 99%