矩形槽机匣对轴流通风机气动性能和噪声的影响

Influence of rectangular slot receiver on aerodynamic performance and noise of axial flow fan

为探究矩形槽机匣对轴流通风机气动性能及噪声的影响,以单极轴流式通风机为研究对象,采用FLUENT对各方案机匣风机性能进行数值计算,并利用Lighthill声比拟进行噪声预测。研究结果表明:矩形槽机匣能使风机全压下降,效率提高;使叶顶区域流场更加紊乱,叶片表面静压得以重新分布,减缓泄漏流的发展,叶轮做功能力下降;轴流通风机近场以离散噪声为主,叶顶区域噪声最大,尾缘区域次之,前缘区域噪声最小;矩形槽机匣对风机噪声影响显著,合理的开槽结构可使风机噪声降低。通过实验验证了数值计算的可靠性,为轴流通风机气动性能和噪声研究提供数据支持和实验基础。

In order to explore the influence of rectangular groove casing on the aerodynamic performance and noise of axial flow fan,the unipolar axial flow fan is taken as the research object.FLUENT is used to numerically calculate the performance of casing fan in each scheme,and Lighthill acoustic analogy is used to predict the noise.The results show that the rectangular groove casing can reduce the total pressure of the fan and improve the efficiency.The flow field in the blade tip region is more disordered,the static pressure on the blade surface is redistributed,the development of the leakage flow is slowed down,and the power capacity of the impeller is reduced.The near-field of the axial fan is dominated by discrete noise,the noise in the tip region is the largest,followed by the trailing edge region,and the noise in the leading edge region is the smallest.The rectangular groove casing has a significant effect on the noise of the fan,and a reasonable slotted structure can reduce the noise of the fan.The reliability of the numerical calculation is verified by experiments,which provides data support and experimental basis for the study of aerodynamic performance and noise of axial flow fan.