A chemi-ionization processing approach for characterizing flame flickering behavior

The present work focuses on a new method based on chemi-ionization to measure the flame flickering frequency. The flame flickering behavior was determined using the ion generation rate of the flame, characterized by measuring the saturation current with ion probe. A systematic comparative study was conducted by applying ion probe and other methods, such as flame detector, digital camera in the premixed flame. The flame flickering behavior was described using the frequency spectrum obtained by time series data of different technologies. Results indicate that the chemi-ionization method show excellent ability in measuring flame flickering frequency. Meanwhile, ion signals presented some detailed difference compared to the common technologies. Furthermore, by setting ion probe in different positions of the flame, frequency distribution can be measured and applied to evaluate the degree of non-uniformity and instability of combustion field.