The Generalize Study of Anomalous Phenomena and there Control in Turbomachinery

为了分析和控制涡轮机械的异常现象，不同大学的不同团队进行了以下研究。名古屋大学团队：观察了一台低水头水轮机的尾水管失速。通过引入进口旋流来抑制失速，明确了不同类型旋流发生器的最佳旋流强度。横滨国立大学研究小组：在离心泵无叶扩压器壁上沿径向开槽，可以在很大的流量范围内抑制失速。九州理工大学团队：从实验和理论上阐明了旋转叶片和静止叶片之间干涉引起的压力脉动。Mie大学团队：通过实验研究了垂直不均匀风速对叶片压力分布的影响。九州大学团队：通过实验明确了泵诱导器空化脉动与叶片角度的关系，并获得了预测方法。大阪大学团队：为了抑制由旋转空化引起的泵诱导器的非周期性振动，发现不同弦长叶片的交替行为是有效的。

In order to analyze and control the anomalous phenomena of turbomachinery, the following studies were conducted by separate teams of different universities.Nagoya University Team : The stall in a draft tube of a low-head water turbine was observed. By introducing an inlet swirl the stall could be suppressed and the optimum strength of the swirl was clarified for different types of swirl generators.Yokohama National University Team : Using shallow slits grooved radially in the wall of vaneless diffuser of a centrifugal pump, the stall could be suppressed for a wide range of flow rate.Kyushu Institute of Technology Team : The pressure pulsation caused by the interference between the rotating and stationary blades was clarified experimentally and theoretically.Mie University Team : The effects of the vertically uneven wind velocity on the pressure distribution on the blades were examined experimentally.Kyushu University Team : The relation between the cavitation surge and blade angle of a pump inducer was clarified experimentally and the prediction method was obtained.Osaka University Team : To suppress the non-periodical vibration of a pump inducer caused by the rotating cavitation, the behavior of blades with alternatively different chord lengths was found to be effective.