Research on axial hydraulic thrust of francis pump-turbine's runner

Pump-turbine runner (low specific speed Francis turbine) in operation is subjected to axial hydraulic thrust, this force has an impact on the stabilization of the generator set's axial position, and has a direct effect, which have not been paid enough attention, on the safe operation of the set. Using theoretical analysis calculation and field measurement, also considering Tianhuangping pump-turbine runner, this paper has examined several factors that have effects on axial hydraulic thrust.