This paper describes the results of experimental studies of a flow using the prototype of a propeller-type microhydraulic turbine. The tests are carried out on a testbed in which atmospheric air is used as a working medium. The measurements carried out with the help of a two-component laser-Doppler anemometer are used to obtain velocity distributions behind a runner in the case where the operating modes of the device change in a wide range. It is shown that the created model microhydraulic turbine has optimal parameters for the conditions set during the design, and a change in the operating mode of the device from nominal parameters to underload or overload increases the residual swirl of the flow and the generation of strong hydrodynamic instability in the form of a precessing vortex rope. In this case, axial velocity over the cross section is distributed unevenly and the flow pulsation level is increased.

中文翻译：

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微液压涡轮机模型中的流动结构分析

本文描述了使用螺旋桨式微液压涡轮机原型对流动进行实验研究的结果。测试在使用大气作为工作介质的测试台上进行。借助双分量激光多普勒风速计进行的测量用于在设备的操作模式在大范围内变化的情况下获得跑步者后方的速度分布。结果表明，所创建的模型微液涡轮机在设计时设定的条件下具有最佳参数，并且装置运行模式从标称参数到欠载或过载的变化增加了流动的残余涡流和强流体动力的产生。旋涡绳形式的不稳定性。在这种情况下，