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ABSTRACT: The ionization sensor is an electrical probe for diagnostics in internal combustion engines. Laser-induced fluorescence (LIF)
imaging of fuel, hydroxyl (OH), and nitric oxide (NO) distributions has been employed to extend our knowledge about the governing
processes leading to its signal. By monitoring the flame propagation in quiescent and turbulent mixtures, the cycle-to-cycle
variations in the early sensor signal was attributed to the stochastic contact between flame front and electrodes. An analysis
of the relationship between gas temperature and sensor current in the post-flame gas suggests a dominant role of alkali traces
in the ionization process at the conditions under study. Significant cooling of the burned gas in the vicinity of the electrodes
was observed in quiescent mixtures. Imaging of the post-flame gas in turbulent combustion revealed moving structures with
varying NO and OH concentrations, which were identified as sources of variation in the sensor current.
Applied Physics B 12/2005; 81(8):1135-1142. · 1.78 Impact Factor
Appl. Phys. B. 01/2005; 81(8):1135-1142.
SAE transactions. 01/2003; 112(3):1595-1600.