Increase of the efficiency of small hydroelectric stations
Orthogonal rotor turbines equipped with blades of a symmetric profile can be regarded as a prospective type of free-flow hydraulic machine which can be installed either in the free flow in a river channel and ocean or in the channels of chutes, spillways, and irrigation systems.
The utilization factor of the kinetic energy of a stream in the free-flow scheme reaches 0.54–0.59; in flume-concentrators the efficiency increases to 0.90.
The new type of rotor turbines has substantially increased (by a factor of 3–5) velocity characteristics; its self-starting is provided.
The noted tendency of a substantial effect of the boundaries permits counting on high energy characteristics of the rotor turbines in pressure systems.
Rotor turbines with consideration of their low consumption of metal and cost of manufacture can successfully compete with the usual types of turbines in designs of low-head small hydrostations.
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