Author(s): H M Lei; F N Chen; S H Ahn; Y X Xiao; X J Zhou; C J Zeng; H G Fan; Z W Wang

Linked Author(s):

Keywords: Axial flow turbine; Gravity effect; Hydraulic performance; Runner diameter; Cavitation

Abstract: This paper wants to analyse the influence of gravity in the axial turbine. In this paper, the influence of axial turbine on the gravity field of different runner diameter is analyzed at the same head, the same opening degree of the guide vanes and runners and the same unit speed. The turbulent model is SST. And in these calculations I consider the impact of runner gap. According to the simulation, when the Fr exceeds 2.3355, the effect of gravity is negligible. When Fr less than 2.3355, the efficiency, flow rate and power considering the gravity are greater than the case without considering gravity. The lower surface of the runner is prone to cavitation when gravity is considered. With the decrease in the diameter of the runner, the difference in pressure distribution between considering the gravity and without consideration of gravity is reduced.

DOI: https://doi.org/10.1088/1755-1315/163/1/012028

Year: 2017