离心压缩机叶轮的旋转失速及其对叶片的危险激振(二)——叶片失效事例分析

• 作 者: H.HASEMANN U.Haupt U.SEIDEL M.RAUIENBERG 常恒栓
• 机 构: 德国汉诺威大学透平机械研究所,德国汉诺威大学透平机械研究所,德国汉诺威大学透平机械研究所,德国汉诺威大学透平机械研究所,中国科学院工程热物理研究所,
• 出 处: 水利电力机械
• 发表日期: 1992年05期
• 关键词: 离心压缩机 旋转失速 激振 失效 压力脉动 扩压器 叶片进口角 压缩机 叶片 半径比

介绍了一个后向叶轮压缩机在16000r/min 转速情况下进入旋转失速状态而引起叶片失效的例子。为了搞清失效的原因,用复制叶轮在同样的压缩机上,对不稳定流动作了系统研究。在目前的情况下,发现双旋转失速团激振的二倍频正好落在共振范围内,而强使叶片失效。还发现危险激振的另一个来源是多气团旋转失速的激振。现在已开始研究多失速团现象的影响因素,这些研究表明,增大扩压器进口半径比和减小扩压器叶片进口角可以减轻这种危险激振的危害性。

An example of a vane failure caused by a backward impeller compressor entering a rotational stall state at a rotational speed of 16000 r / min is introduced. In order to find out the cause of the failure, a replica impeller was used on the same compressor to systematically study the unsteady flow. In the present case, it was found that the double frequency excited by the double-revolving stall mass just fell within the resonance range, but the blade was forced to fail. Another source of dangerous excitations was also found to be excitation of stalls with multiple air masses. The effects of multi-stall phenomena have now begun to be investigated. These studies show that increasing the inlet radius ratio of the diffuser and reducing the inlet angle of the diffuser blade can mitigate the danger of this dangerous excitation.