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Use of horizontal bulb units in propeller regimes
Conclusions A propeller regime for horizontal bulb units is possible and in the optimum provides a normal energy efficiency.The optimal runner blade angle $ ϕ_{opt} $=+7° was determined for head $ H_{av} $=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% $ S_{0} $. In this case the pressure fluctuations behind the runner decrease to $ 2A_{max} $=11.2 m $ H_{2} $O (115% $ H_{st} $). 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 A propeller regime for horizontal bulb units is possible and in the optimum provides a normal energy efficiency.The optimal runner blade angle $ ϕ_{opt} $=+7° was determined for head $ H_{av} $=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% $ S_{0} $. In this case the pressure fluctuations behind the runner decrease to $ 2A_{max} $=11.2 m $ H_{2} $O (115% $ H_{st} $). 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)
1991
Article (Journal)
English
BKL:
56.30
Wasserbau
Local classification TIB:
770/6550/8000
Use of horizontal bulb units in propeller regimes
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