抄録
In this experiment, swirler is set at each angle; α(α=15,30 and 45 deg.), and the swirl number is 0.162,0.334 and 0.519,respectively. As the result, in the case of α=15 deg., two different modes of oscillatory flame were observed in the same condition of air flow rate. In the cases of α=30 deg. and the oscillatory frequencies were varied ranging from 125 Hz to 160 Hz. Furthermore, it was found that these frequencies corresponded to the noise level. So the system of the active control is established with the sound level meter (sensor) and mass flow meter (actuator). Figure 1 shows a result of the active control. In this system, air flow rate was controlled when the noise level was to be about 86 dB. Then, the oscillatory flame was changed into a stable flame with low-level noise. The present system is fundamental for the active combustion control. However, we could get a good result for a future closed-loop system.
