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受鲤科鱼类C型启动逃逸反应时高效率游动姿态及其周围涡流特征的启发,进行叶片仿生设计,以提升多翼离心风机的气动性能。首先,采用逆向工程方法获取了鲤科鱼C型启动姿态时鱼体中心线方程和水平剖面轮廓线方程,以C型启动时鱼体中弧线为基准,设计了仿生等厚叶片。其次,通过多翼离心风机气动性能数值计算和实验测试,得到了具有最佳进口安装角的仿生等厚叶片(O-BETB)
采用O-BETB的多翼离心风机的风量增加了6.8%
噪声下降了0.5 dB(A)。最后,将仿生重构的鱼体流线型轮廓与O-BETB相耦合,得到仿生耦合叶片(CBB)
以进一步提高多翼离心风机气动性能。结果表明:当采用CBB时,多翼离心风机的风量增大了8.3%
噪声下降了1.1 dB(A)。基于流场分析,发现具有仿生中弧线和鱼体轮廓特征的耦合叶片在前缘进口角及叶片型线具有更好的引流导向作用,叶间流道的低速分离旋涡明显小于另外两种叶轮;叶片尾缘的尾迹涡脱落引起气流不均匀性程度也最弱,有效缓解了尾流与蜗舌、蜗壳之间的非定常相互作用。通过多翼离心风机声场特性的分析,发现多翼离心风机的气动噪声主要集中在中低频段。CBB的采用,叶轮通道内分离涡被抑制,叶片尾流与蜗壳壁面之间非定常作用减弱,叶片表面和蜗舌处的声压脉动得到有效的控制,这也是CBB风机中低频噪声降低的主要原因。
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