Ion-current fluctuations recorded with a cylindrical electrostatic probe passing premixed flames
✍ Scribed by Takuji Suzuki; Yoichi Hashimoto; Ichiro Mashiko; Toshisuke Hirano
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 660 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0010-2180
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✦ Synopsis
The ion-current fluctuation recorded with a cylindrical, electrostatic probe traversing a premixed flame has been studied. The experiments were performed by moving the probe across a rectangular or circular-nozzle burner flame;
Effects of the ion-denesity distribution on the ion-current fluctuation were estimated by analyzing the phenomena near the probe on the basis of the continuum probe theory, and the deviation of the ion current was shown to increase with the ion-density gradient. By comparing the maximum ion currents to the probe traversing the flame in different directions, the deviation was found to decrease with increasing probe velocity. It was estimated to be less than 15% if the probe was used in the range of probe velocities higher than 3 m/sec.
An analysis was made for inferring the ion-current fluctuations to be recorded with the probe being passed through flames of known configuration. The results showed that the ion-current fluctuation of an inclined or curved flame could be inferred fairly well on the basis of the fluctuation derived from a plane flame parallel to the probe axis. * To whom correspondence should be addressed. tuation and these characteristics of the flame passing the probe were revealed, the behavior of a propagating or turbulent flame would be elucidated to a greater extent by a/aalyzing the ioncurrent fluctuation measured by using an electrostatic probe. However, most such relations have remained obscure.
The ion current to an electrostatic probe immersed in a gas of uniform ion density depends not only on the ion density, but also on the probe potential, probe size, and gas velocity [7-14], so that the fluctuation of the ion current to an electrostatic probe passed through a flame can be expected to depend on such quantities. Furthermore, effects of the ion density distribution on the ion-