Effects of Bionic Volute Tongue on Aerodynamic Performance and Noise Characteristics of Centrifugal Fan Used in the Air-conditioner
Effects of Bionic Volute Tongue on Aerodynamic Performance and Noise Characteristics of Centrifugal Fan Used in the Air-conditioner
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DOI：
10.1007/s42235-020-0067-7
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发表时间：
2020-06
影响因子：
4
通讯作者：
Liming Wu;Xiaomin Liu;Menghao Wang
中科院分区：
文献类型：
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作者：
Liming Wu;Xiaomin Liu;Menghao Wang
空调用离心风机产生的气动噪声关系到人类生活和工作的舒适度，可以通过对离心风机关键部件进行仿生设计和优化来控制。受长耳猫头鹰翅膀非光滑前缘的启发，提出了八种蜗舌来降低离心风扇的气动噪声。通过结合计算流体动力学和计算空气声学对流动和声音特性进行数值研究。最佳结果是，质量流量略有增加，噪音降低高达 1.5 dB。讨论了声压级、功率谱密度和声音方向性方面的声学特性。对压力脉动的时域、频域和均方根值进行监测和分析，以评估蜗舌和叶轮之间的非定常流动相互作用。离心风扇内涡流的强度和规模在仿生蜗舌的上下游受到抑制，蜗舌表面的湍流效应变得均匀且弱。
The aerodynamic noise generated by the centrifugal fan used in the air conditioner is related to the comfort of human living and working, which can be controlled by using the bionic design and optimization of key components of centrifugal fan. Inspired by the non-smooth leading edge of long-eared owl wing, eight kinds of volute tongues are proposed to reduce the aerodynamic noise of a centrifugal fan. The flow and sound characteristics are numerically investigated by incorporating computational fluid dynamics and computational aero-acoustics. The optimal result exhibits a noise reduction of up to 1.5 dB with a slight increase in mass flow rate. The acoustic characteristics, with respect to the sound pressure level, power spectral density, and sound directivity are discussed. The time-domain, frequency-domain, and root mean square values of pressure fluctuation are monitored and analyzed to assess the unsteady flow interaction between the volute tongue and impeller. The intensity and scale of vortices in the centrifugal fan are suppressed in the upstream and downstream of the bionic volute tongue, and the turbulence effect on the surface of the volute tongue becomes even and weak.