Use of horizontal bulb units in propeller regimes

摘要

1.A propeller regime for horizontal bulb units is possible and in the optimum provides a normal energy efficiency.2.The optimal runner blade angle ϕopt=+7° was determined for head Hav=9.8 m; the following are provided at this angle: A high efficiency in a broad range of powers; Smooth steady and transient operating regimes of the unit with respect to all parameters, including the vibration characteristics of the unit and powerhouse; Normal proecesses of starting the units, connection to the power supply by the self-synchronization method, buildup of the load, unloading and automatic stopping, dropping the load, i.e., all possible static and dynamic operating regimes of the units; The “rocking” of the gate apparatus in the range 300–420 mm noted during starting should be limited by an opening S=40 S0. In this case the pressure fluctuations behind the runner decrease to 2Amax=11.2 m H2O (115 Hst). It is expedient to simultaneously shorten the time from the moment of starting to connection of the units to the power-supply system; Stopping of the block does not differ in its dynamic characteristics from the analogous process with a governor; Dropping the load does not cause a negative pressure behind the runner, overspeeding is within permissible