正弦锯齿尾缘对轴流风机尾迹及气动性能的影响

发布时间：2018-02-14 10:40

本文关键词： 正弦锯齿尾缘轴流风机尾迹噪声　出处：《工程热物理学报》2017年10期 　论文类型：期刊论文

【摘要】：轴流风机尾缘涡脱落是产生噪声的重要因素,为改善尾迹流动来降低风机噪声,通过在轴流风机尾缘添加一种正弦形锯齿结构,采用定常及非定常数值模拟的手段结合实验验证的方式,分析其对轴流风机尾迹和气动性能的影响。研究结果显示,正弦锯齿结构削弱了叶片尾缘做功能力,使得风机全压降低,但提升了中小流量工况下风机效率;并能减弱叶片中部以下位置的尾迹强度,且对尾迹的抑制作用从叶片部底到中部逐渐减弱;以增加转速的方式补偿锯齿结构引起的压损,对原型风机和提升转速后的尾缘锯齿结构风机在设计流量点进行噪声数值预测分析,结果显示低频段噪声比原型机有明显改善,表明这种尾缘正弦形锯齿结构一定程度上是一种抑制轴流风机低频噪声的有效途径。
[Abstract]:The vortex shedding of the tail edge of the axial fan is an important factor to produce noise. In order to improve the wake flow to reduce the noise of the fan, a sinusoidal sawtooth structure is added to the tail edge of the axial fan. The effects of steady and unsteady numerical simulation on the wake and aerodynamic performance of axial fan are analyzed by means of steady and unsteady numerical simulation combined with experimental verification. The results show that the sinusoidal sawtooth structure weakens the work ability of blade tail edge. The total pressure of the fan is reduced, but the efficiency of the fan is improved under the condition of medium and small flow, and the wake intensity below the middle part of the blade is weakened, and the restraining effect of the wake is gradually weakened from the bottom of the blade to the middle of the blade. In order to compensate the pressure loss caused by the saw tooth structure by increasing the rotational speed, the noise numerical prediction analysis of the prototype fan and the tail edge saw tooth structure fan after lifting the speed of speed is carried out at the design flow point. The results show that the noise in the low frequency band is obviously improved than that of the prototype machine. The results show that the tail-edge sinusoidal sawtooth structure is an effective way to suppress the low frequency noise of axial fan to some extent.
【作者单位】：华中科技大学能源与动力工程学院;广东绿岛风室内空气系统科技有限公司;
【基金】：国家自然科学基金(No.51376077) 中国南方智谷引进创新团队项目(No.2013CXTD01)
【分类号】：TH432.1

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