A theoretical method for the prediction of cavitation in hydraulic radial turbines is
developed in this work. The method combines a steady, quasi-three dimensional
analyses which are based on the streamline curvature technique with an approach for
the prediction of cavitation based on the definition of "available" and "required"
cavitation coefficients. A radial inflow turbine is selected as a test case to investigate
the capability of the present method as a cavitation prediction tool at design and offdesign
conditions. The effects of various operating conditions on the cavitation
inception are examined at constant values of total head and turbine suction head. It has
been found that cavitation is formed near the outlet when the turbine operated at the
design speed. While at off-design speeds and flow rates, cavitation covers longer
distances along suction and pressure surfaces.