Numerical study of the screw rotors for small scale hydropower

Abstract

This paper reports on the investigation of screw rotors with different geometric parameters by numerical simulation. The study was performed for the free flow around a fully submerged system. The effect of the inner shaft diameter, the rotor screw pitch and running frequency on the energy characteristics, as well as the torque on a shaft and generated power are shown. Following up upon the conducted research of the screw rotor the geometric parameters and operating modes, which allow achieving maximum effectiveness at the same initial parameters, were determined.