A simplified PIV-based method for flame velocity distribution measurement

In the paper, a simplified method based on particle image velocimetry (PIV) for flame velocity distribution measurement is proposed. A high speed camera was first used to capture consecutive images, and multilevel thresholding segmentation based on Otsu´s method was used to enhance the image contrast. Then the velocity distribution is calculated by means of DFT. Experiments were carried out to validate the feasibility of the proposed method by using a methane/air premixed burner. Calculation results show that the flame velocity distribution can be completely obtained by the aid of multilevel thresholding segmentation. The experimental results show that the flame velocity distribution agrees well with the flame structure and the motion feature. The proposed method can be further applied in monitoring of industrial combustion process.