串列叶片式前向离心风机气动与噪声特性的优化研究

Aerodynamics Optimization and Noise Characteristic for Forward-Swept Centrifugal Fan with Tandem Blades

对采用串列叶片的某前向离心风机内部三维非定常流动进行了数值计算,重点研究了串列叶片不同叶片相对长度和不同叶片相对周向位置两个参数对风机气动性能及气动噪声的影响。通过响应面方法对数值结果进行二次回归拟合,得到两个参数与风机效率和A声级间的函数关系,并进行了优化分析。数值结果表明:两个参数对串列叶片式前向离心风机效率和A声级均有较大影响,合理的串列叶片设计能够在保持气动性能基本不变的情况下降低风机的气动噪声。将可靠的CFD数值技术与响应面方法结合起来用于指导离心风机的改进及试验设计是可行的,本文的研究结果可为串列式离心风机在节能与降噪的总体设计方面提供参考。

A numerical optimization for aerodynamic performance and aerodynamic noise of a forward-swept centrifugal fan with tandem blades is carried out.Three-dimensional unsteady viscous flows are investigated for the whole impeller-volute configuration.The influences of relative length and circumferential position of tandem-blade on the aerodynamic performance and aerodynamic noise of the centrifugal fan,are discussed.And the response surface methodology(RSM)with full factorial designs is used to obtain an approximated efficiency and A-weighted sound pressure level in terms of the two parameters.The analysis shows that the two parameters significantly affect the efficiency and A-weighted sound pressure level of the tandem-blade centrifugal fan.Reasonable tandem-blade designs can lower the aerodynamic noise remaining the aerodynamic performance.The feasible method of reliable CFD technique combined with RSM can be effectively applied to the improvement and experiment design of centrifugal fans.