Rijke tube
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Can you tell me please length of the tube? Measured frequency of 300 Hz at the start and very strong second harmonic at 600 Hz in time when you removed burner. Second harmonic first half second is almost stronger than fundamental frequency.
Estimated length of the tube is 60 cm? And temperature at the grid reached 1020°C? At this temperature, speed of sound is exactly double. This may explain so strong second harmonic at the start.
Near the end, frequency drop to about 285 Hz.
MilanKarakas 6 months ago
Wait.....Why? Why did it do that!?
SmileysRevenge100 7 months ago