ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Experimental of fan broadband noise determination based on rotating axial arrays
Received date: 2017-01-15
Revised date: 2017-06-12
Online published: 2017-06-12
Supported by
National Natural Science Foundation of China (51476134); China-European Union International Cooperation Project on Aviation Science (688971)
To reduce aircraft engine noise, a measurement technique is urgently needed for broadband noise determination inside the turbomachinery duct to guide noise reduction design. In this paper, results of the sound power propagating upstream and downstream are determined with cross-correlation analysis of sound pressure. The microphone arrays installed upstream of the fan rig consist of 2 axial arrays with circumferential interval of 180°, with each array having 14 equidistant microphones. Arrays are installed on a rotating duct. In the experiment, the duct rotates once per 6°, and the sound pressure data of 840 positions in total are acquired. The incident sound waves can be as much as 10 dB higher than the reflected sound waves. The decomposed modal results show that rotor-stator interaction modes are the dominant modes at blade passing frequency and its harmonics. The decomposed results are consistent when different sensors are used as reference signals and thus this experimental method is not sensitive to the reference signal position, showing good applicability of the method.
Key words： broadband noise; mode; array; turbomachinery; fan
XU Kunbo , QIAO Weiyang , HUO Shiyu , CHENG Haoyi , TONG Fan . Experimental of fan broadband noise determination based on rotating axial arrays[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017 , 38(11) : 121132 -121132 . DOI: 10.7527/S1000-6893.2017.121132
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