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Use of horizontal bulb units in propeller regimes
Conclusions 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 limits.
Use of horizontal bulb units in propeller regimes
Conclusions 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 limits.
Use of horizontal bulb units in propeller regimes
Potashnik, S. I. (author)
Hydrotechnical Construction ; 25 ; 604-608
1991-10-01
5 pages
Article (Journal)
Electronic Resource
English
Use of horizontal bulb units in propeller regimes
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