Modeling propeller wind turbine software heliciel
wind turbine pumping
The pumping wind turbines are designed to provide water. The need for water is such that the objective of the wind turbine pump will be slightly different from the wind turbine power generation.The windmill for pumping should be able to run on the largest possible range of wind, as the site of geographic location will no longer be selected for profitability,but from duty to produce water throughout the dry period.
The rotational speed and torque of the machine implies that the number of blades is adapted to the speed of rotation: A small number of blades is sufficient to capture the energy of the propeller disc only if the rotation speed is high, but if the speed is low, a large part of the wind pass through the propeller without actuating the blades:

vent apparent passage entre pales

benefits disadvantages
Captures the energy with a low blade number, thus providing the benefits of the low number of blades: economic cost in manufacturing the apparent wind and the angles of incidence of profiles section generate a bad alignment of lift and drag forces , with the plane of rotation, This requires good profiles quality sometimes difficult to achieve.
Rotating tangential flow downstream of the propeller Revelle energy lost by the system. At equal power (Pw = torque nm x speed rad rotation / sec), a high rotational speed uses less torque generated so less losses. sometimes requires assistance of starting when the starting torque is insufficient
speed of rotation closer to generator system (the price of the generator and gear box will be lower) speed of rotation and torque not suitable for pumping
limited exposure to violent winds  
benefits disadvantages
Allows the use of simple forms blades economic cost in manufacturing to get a good performance it takes a lot of blades (more expensive, heavier, to the wind when storms ...)
start even at low wind speeds Rotating tangential flow downstream of the propeller Revelle energy lost by the system. At equal power (Pw = torque nm x speed rad rotation / sec), a low rotational speed uses more torque generated so more losses.
speed of rotation and torque suited for pumping speed of rotation far to generator system (the price of the generator and gear box will be higher)
wind turbine piston pump an screw:
The slightest breath of air should be used, and the operating torque required to operate a piston pump is much higher than that of an electric generator. To generate torque on the propeller shaft of the wind turbine at the start, so at low speed, it will use all the energy of the wind passing through the propeller.

fonctionnement pompe eolienne

The wind turbines that the starting torque should be high, such as wind pumping actuating a piston pump or screw pump, must have a high number of blades..

eolienne pompage

 

eolienne pompage

The disadvantages of wind operating a piston pump: The power of a propeller wind increases with the cube of the wind speed. To capture the wind power effectively, the wind turbine must run faster. We obtain a relation between rotational speed and power, which increases in cubic way. The piston pump is a volumetric pump, whose relationship, speed-power is almost proportional, so linear.This implies that the wind turbine and the pump will have only one zone of optimum efficiency, and as soon as the operating range is exceeded, the wind turbine will lose a lot of energy because its rotation curve-power will not be used at the best:puissance eolienne pompage

The pumping windmills operating a centrifugal pump have a lower torque operation, therefore the number of blades can be reduced

eolienne pompe centrifuge.

In addition, the power-speed curve of the centrifugal pump can be adapted, during construction, to match with the wind turbine:

courbe eolienne pompe centrifuge

Systems of electric pumps coupled to the wind power generation is an attractive solution and has some advantages: