Research Article
The Acoustical Behavior of Contra-Rotating Fan
Table 4
The test conditions and results.
| | Number | Distance
(mm) | Speed
(m/s) | Flow
(m3/min) | Pressure
(Pa) | Efficiency
(%) |
| | 1 | 430 | 20 | 952.892 | 1120.614 | 33.8 | | 2 | 114 | 17 | 857.454 | 3564.879 | 66 | | 3 | 65 | 15 | 752.752 | 5666.926 | 75.375 | | 4 | 41 | 13 | 639.836 | 6719.235 | 73.475 | | 5 | 28.5 | 10 | 595.033 | 7078.894 | 60.372 |
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