New formulae for efficiency scaling-up from model to prototype of a hydraulic turbine are presented based on the theoretical analysis that considers the only friction losses through the turbine. Two formulae are presented; one is the precise conversion formula, and the other the simplified ...
Evaluation of the turbine efficiency for the whole range of admissible discharge and head was, and still is, the standard experimental investigation on model turbines in order to predict the performances of the real size machine. The resulting efficiency “hill chart” usually displays a peek effici...
It was the first trial in the world to develop a large-scale experiment on the transient process in a combined hydromechanical and electrical system with a model turbine generator unit. The experiment quantitatively defined the reasonable regulation parameters for the units and revealed the impact ...
Coal is the “ballast stone” of China’s energy security, and the safety and efficiency of coal mine production are crucial. As the first production site of coal mining, the intelligent level of the fully mechanized mining face is directly related to the safety production and mining efficiency...
The interpolation model of pump turbine based on im⁃ proved Suter transformation and BP neural network has been put forward to improve the accuracy in the S characteristic area. The formula of water head for compensating error is derived using the discrete analysis of variable-scale space-time...
The driver of the pump, which may be an electric motor, a turbine, or a diesel engine, must provide enough power to the pump. Based on the driver efficiency, its power will be more than the pump power calculated. An electric drive motor may have an efficiency of 95%, which can be ...
The minimum level would be governed by operating requirements and by the economic balance between the value of the developed head at the site and at the downstream places.The relation between draw down and minimum head should be such that a reasonable turbine efficiency will be maintained through...
With this objective, we may suppose that at full loading the efficiency of the transformation of hydraulic energy into electrical energy is the product of the efficiency of the electromechanical stage (varying between 0.85 and 0.90, slightly less than that of the turbine) times the efficiency of ...
The above and other objects of the present invention can be accomplished by a steplessly variable power transmission comprising a torque converter provided with a pump device having an input member connected with an engine output member of an engine and a turbine device having an output member. ...
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