Basic Characteristics of Cylindrical, Electrostatic Probes for the Measurements of Fluctuating Premixed Flames

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An experimental study has been conducted to explore the effects of the potential, size, and velocity of a cylindrical, electrostatic probe on the ion current fluctuation recorded when the probe traverses a premixed, two-dimensional nozzle burner flame parallel to the probe axis. The maximum ion current was found to be proportional to the probe length Lp and to increase with increasing probe diameter dp, probe velocity Vp, or absolute value |Ψp| of the probe potential Ψp. In the ranges of Lp from 1 to 14 mm and Vp from 1 to 22 mm/s, the estimated half-value thickness δh of the high-ion-density region near the flame decreased and approached about 0.4 mm as |Ψp| and dp were decreased. When the probe was operated under practical conditions, e.g., |Ψp|&fim; 40 V and dp &fim; 0.4 mm, the value of δh would be between 0.4 and 0.8 mm.
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