Rijke管自励音の発生機構に関する研究

抄録

Combustion equipment generates self-excited vibration called combustion vibration. The noise generated by this ｒ vibration is undesirable because it can damage structures and degrade their performance. Because this vibration phenomenon is complex, it is very difficult to model. Therefore, the purpose of this study is to attempt modeling of Rijke tubes, which are prone to combustion vibration from the perspective of heat transfer engineering, and to reproduce the sound pressure waveform of Rijke tubes using the cellular automaton (CA) method. Since previous studies have summarized the properties of a Rijke tubes and the rules of the CA method, we referred to them and incorporated them into this study. Previous studies have shown that the particle velocity in the heat source section including time delay causes self-excited oscillation. In this study, we derived an equation for the particle velocity with time delay by using heat transfer engineering based on the expansion and contraction of air. The sound pressure waveform of the Rijke tube could be quantitatively reproduced by numerically calculating the time of passage through the heat source and determining the number of time delay from time to time．