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| operating condition | hydrogen flow rate (N mL/min) | methane flow rate (N mL/min) | equivalence ratio (φ) | acoustic frequency (f) (Hz) | acoustic amplitude (ratio of velocity fluctuation to average velocity) (A) |
|---|---|---|---|---|---|
| 1 | 0 | 1000 | 0.75–1.0 | 90–240 | 0–0.5 |
| 2 | 100 | 900 | |||
| 3 | 200 | 800 | |||
| 4 | 400 | 600 |
