Vol. 7, Issue 2, Part B (2025)

The pressure distribution and velocity distribution in the runner, the flow regime and pressure pulsations inside the turbine is related to the lean angle of the runner blade leading edge.
In this paper, the effect of the lean angle of the runner blade leading edge on the pressure pulsation in the flow passage of Francis-130 turbine operating in off-design condition is investigated.
This paper presents the variation of the characteristics of the turbine, the pressure distribution and the pressure pulsation in the flow channel of runner, spiral casing, guide vanes and draft tube with the change of lean angle of the leading edge based on numerical simulation, and a suitable range of the lean angle of the blade leading edge is suggested.
The study concluded that the lean angle of Francis-130 turbine is 20° which is more suitable for improving the hydraulic turbine operating stability.