均匀轴流条件下应用模态匹配法设计声衬和实验验证

Using the mode match method liner design and experimental validate in the uniformity axis flow

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.

The mode match method has been used for the liner design and optimization of the low speed fan facility.The experimental results and the trend of the calculation results are identical with each other.2 liners both has significant effect for the ＋4 order mode of 2 blade passing frequency（BPF）.The first forward liner’s insert loss is 30.4 dB,and the backward liner’s insert loss is 20.25 dB;the second forward liner’s insert loss is 21.85 dB,and the backward liner’s insert loss is 18.85 dB.It’s proves that,mode match method can be used in the liner design and optimization,and the experimental platform for the nacelle design was gotten.The cost of liner design for the aero engine nacelle can be reduced.