Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 13, 2020 - September 16, 2020
Self-excited vibration called the combustion vibration occurs in the combustion apparatus. The purpose of our research is to analyze the mechanism of generating the combustion vibration using a cellular automaton method (abbrev.CA). The expansion of the air in the heat source expressed by the vibration of the piston. Since the expansion depend on the flow velocity, the particle velocity in the heat source was fed back to the amount of vibration of the piston. Furthermore, we created a model when there is no convection. As a result, it was found that the particle velocity including time-delay causes self-excited vibration. Furthermore, the backward flow and the temperature drop of the heat source suppress the self-excitation vibration. Moreover, we were able to reproduce the experimental result of horizontal Rijke tube. It was also found that positive feedback of sound pressure promotes growth of self-excited vibration, and negative feedback suppresses growth of self-excited vibration.
