关键词: 多翼离心风机, 蜗舌, 气动性能, 声学性能, 吸油烟机

Abstract: The volute tongue, as one of the core components of a multi-blade centrifugal fan, has a significant influence on the aerodynamic and acoustic performance of range hoods. Existing volute tongues are generally designed as straight or concave types, which are poorly matched with the asymmetric internal flow field of fans equipped with double-inlet impellers. To address the issue, an asymmetric inclined straight volute tongue was designed. By combining numerical simulation with experimental investigation, a comparative study was conducted on the overall aerodynamic and acoustic performance of range hoods employing the asymmetric inclined straight volute tongue, the straight volute tongue, and the concave volute tongue. The results show that, owing to its superior capability to suppress backflow, the asymmetric inclined straight volute tongue reduces the A-weighted sound power level by 0.3 dB and 0.4 dB compared with the straight volute tongue and the concave volute tongue, respectively, under low-flow-rate conditions. Under high-flow-rate conditions, the noise is reduced by 0.8 dB and 0.5 dB, respectively, while the power consumption is reduced by 45 W and 20 W, respectively.

Key words: Multi-blade centrifugal fan, Volute tongue, Aerodynamic performance, Acoustic performance, Range hood