多翼离心风机小流量工况流动特性PIV研究

发布时间：2018-02-20 07:32

本文关键词： 多翼离心风机粒子成像测速流动特性旋涡流动小流量　出处：《华中科技大学学报(自然科学版)》2017年05期 　论文类型：期刊论文

【摘要】：利用示踪粒子成像测速(PIV)技术对多翼离心风机内部流动进行了测量,分析了小流量工况及最高效率点下蜗舌区域及进口区域处的流场.研究结果表明:蜗舌间隙回流在小流量工况下明显加剧,此时大部分气流随着叶轮在蜗壳中循环流动;两种工况下风机进口区域均存在一旋向和叶轮旋转方向一致的非定常旋涡;和最高效率点相比,小流量工况下蜗壳内的循环气流不仅改变了进口旋涡的位置,也使该旋涡的规模和强度显著提高;对瞬态测量结果的进一步分析表明该旋涡的形态和位置在小流量工况下更为稳定.测量结果可为多翼离心风机小流量工况下性能和噪声的优化提供一定参考.
[Abstract]:The internal flow of multi-wing centrifugal fan was measured by particle imaging velocimetry (PIV) technique. The flow field in the cochlea tongue region and the inlet area under the small flow condition and the highest efficiency is analyzed. The results show that the cochlea gap reflux is obviously increased under the small flow condition, and most of the airflow is circulating with the impeller in the volute. In both cases, there is an unsteady vortex in the inlet region of the fan with the same rotating direction as the impeller, and compared with the maximum efficiency point, the circulating air flow in the volute not only changes the position of the inlet vortex under small flow conditions, The scale and intensity of the vortex are also significantly increased. Further analysis of the transient measurement results shows that the shape and position of the vortex are more stable under the condition of small flow rate, and the measured results can provide a certain reference for the optimization of the performance and noise of the multi-wing centrifugal fan under the small flow condition.
【作者单位】：华中科技大学能源与动力工程学院;宁波方太厨具有限公司浙江省健康智慧厨房系统集成重点实验室;
【基金】：中国南方智谷引进创新团队资助项目(2013CXTD01) 国家火炬计划资助项目(2012GHO41201)
【分类号】：TH432

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