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应用模态匹配法针对低速风扇实验台进行了前传声(圆管)和后传声(圆环管)消声声衬的优化设计,在低速风扇实验台进行消声声衬的消声效果实验验证.实验结果表明:在5 000r/min转速下,设计的两套声衬对于2阶叶片通过频率(1 833.33Hz)+4模态有很好的吸声效果;第一套声衬前传声插入损失为30.4dB,后传声插入损失为20.25dB;第二套声衬前传声插入损失为21.85dB,后传声插入损失为18.85dB.使用模态匹配法可以较好地进行消声声衬的设计,减小了航空发动机消声短舱实验验证的成本.
Applying the modal matching method to the low speed fan experimental bench, the optimal design of the acoustic attenuation (circular pipe) and the rear acoustic (circular pipe) noise reduction lining was carried out. At the low speed fan test bench, The experimental results show that the designed two sets of acoustic linings have a good sound absorption effect on the second-order blade passing frequency (1 833.33 Hz) + 4 modal at a speed of 5 000 r / min. The first acoustic front lining sound The insertion loss is 30.4dB and the insertion loss of the back-propagation sound is 20.25dB. The insertion loss of the second set of front-lining acoustic transmission is 21.85dB and the insertion loss of back-propagation sound is 18.85dB. The use of modal matching method can better suppress noise Lining design reduces the cost of aeronautical engine anechoic nacelle experimental verification.