ABSTRACT

An experimental study is performed to investigate the dynamic behavior of jet diffusion flames from a vertical circular nozzle. A real-time color image processing on slow-motion video recording using the high-speed video camera is employed to clarify the flame morphology. Emphasis is placed on the timewise variation of the flame length, H, and the peripheral distance of the flame, L_p based on the RGB values of the flame. Here, RGB implies the three primary colors (i.e., red, green, and blue), respectively. The Reynolds number, Re, is varied from 500 to 2,000. It is found from the study that (1) real-time color image processing with the aid of a slow-motion video recording discriminates the flame shape and discloses the flame behavior with time, and (2) H and L_p vary periodically with time and are amplified with the Reynolds number.