摘要
本文采用计算流体动力学和声类比相结合的混合方法对空调用离心风机进行流场以及声场的计算,同时进行风机风量和噪声的实验测量,验证所采用的数值计算模型和计算方法的有效性.针对原型非常规蜗壳,提取蜗壳中间截面型线进行直蜗舌的蜗壳设计,在此基础上设计了三种倾斜蜗舌的蜗壳.根据数值计算结果,对最优倾斜蜗舌进行了实验验证。经实验测试,风机在各个工况点风量均有提升,在最大风量点风量提升6.0%,噪声降低1.4 dB(A).数值分析风机内部流动特征及噪声特性,发现在蜗舌附近流动区域内湍流强度和涡量明显减小,在叶片通过频率处声功率谱密度以及噪声峰值明显下降,这也表明风机的旋转噪声得到了有效控制。
The hybrid method combining computational fluid dynamics and acoustic analogy is used to investigate numerically the flow field and sound field of centrifugal fan for air conditioner.And the mass flow rate and noise of centrifugal fan are measured experimentally,which verifies the validity of the computational model and numerical method.As for the unconventional volute used in the original fan,the middle section profile of the volute is extracted to restructure the volute shape with straight tongue.And then,three kinds of volutes with inclined volute tongue are designed.Based on the numerical simulation and experimental measurement,an optimal inclined volute tongue is obtained.The experimental results show that the aerodynamic performance of the fan is improved under all working conditions.The maximum flow rate is increased by 6.0% and the noise is reduced by 1.4 dB(A).The numerical analysis of internal flow and sound characteristics for the optimal fan demonstrates that the intensity and vorticity near the volute tongue are obviously weakened.The power spectral density and the sound peak at the blade passage frequency are reduced,which indicates that the aerodynamic noise of the fan is effectively suppressed.
作者
王梦豪
吴立明
刘小民
WANG Meng-Hao;WU Li-Ming;LIU Xiao-Min(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi'an 710049,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2020年第1期147-153,共7页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51676152)
关键词
离心风机
蜗舌改型
气动噪声
数值模拟
实验测试
centrifugal fan
reconstruction of volute tongue
aerodynamic noise
numerical simulation
experimental test
