The Working Conditions Optimization of Low-Head Water Turbine with Different Guide Vane Outlet Angle

The work of low-head tubular turbine mainly relies on the large flow rate, but the larger flow at different positions of the flow channel are easy to cause different hydraulic loss, and they may also have a poor stability. The research based on a typical case of low-head tubular turbine unit over the Yellow River, according to the efficiency of the low-head tubular turbine and the hydraulic loss theory, and according to the real machine guide vane and the surface shape of turbine vane, when a fixed vane turning, change the guide vane outlet angle and calculate the computing velocity and energy characteristics.Then the unit was found with the highest efficiency between the 200 m³/s - 250 m³/s, and then we put forward the concept of conditions interval optimization from the angle of theory. Do corresponding numerical simulation on its working conditions and the real machine test under the same working condition, the test results consistent with theoretical calculation.In combination with theoretical calculation and the real machine test conclusion, and on the basis of the conclusion of low-head tubular turbine to make condition optimization and through the actual operation to achieve a certain effect, which provide a solution for the economical and safe operation of the low-head tubular turbine.