Optimum combinatorial function of pivoting-vane turbines determined from power isolines

Abstract

As has been shown by many years of experience, gained from tests conducted on hydropower turbogenerators by the All-Unlon Power Engineering Association (Soyuztekhenergo), at most of the newly commissioned hydropower stations equipped with plvotlng-vane hydraulic turbines, the combinatorial function established by the manufacturing factories from model data does not correspond to the optimum relationship and, as a result, additional energy losses occur.For its refinement it is usual to derive propeller characteristics from the results of full-scale tests, during which measurements must be made of, minimally, three parameters: power, head, and discharge. In order to simplify the tests, measurements can be made of the pressure drop (which is proportional to it) at two points in the scroll casing, or the average flow velocity. The method of determirnLng the optimum combinatorial function from the turbine's propeller characteristics gained wide acceptance and is fairly comprehensively deserlbed in the technical literature and in manuals on methods [1-3].