| XU Kun-bo, QIAO Wei-yang, WEI Ren-ke , WANG Liang-feng.An Experimental Investigation on Turbomachinery Broadband Noise Based on Reference Signal Method[J].航空发动机,2017,43(4):79-84 |
| An Experimental Investigation on Turbomachinery Broadband Noise Based on Reference Signal Method |
| DOI： |
| Key Words:broadband noise mode array turbomachinery axial fan |
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| Abstract:TNoise reduction research in aeroengine urgently needs an experimental method to measure turbomachinery broadband
noise. Four rings of microphones installed upstream of an axial fan were used to measure the broadband ducted noise, each ring was
composed of 8 wall-flush mounted microphones. Experiments were conducted at different conditions from 40% to 100% design speed, and
broadband noise results were analyzed by correlation method. Results show that there is little difference in the decomposed broadband
sound fields when different conditions are operating at the same rotating speed. The method can accurately decompose the sound fields into
modal terms and distinguish the mode waves both along and against flow directions. Cross-correlation method is furtherly proved to be
robust in broadband noise determination. |
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