Fluid Mechanics Solutions

PUMP AS TURBINE.

 

It concerns the use of standard pump units as a low-cost alternative to conventional to provide stand-alone electricity generation in remote locations.

 

VIDEO.

 

When the driving force fails the impeller is braked by the hydraulic torque.

The decreasing speed also reduces Q and H for the pump. The pump enters zone C. The combined inertia of the motor and the pump and its entrained fluid maintain a positive pump rotation but at a reduced value at the time of flow reversal due to the positive head in the machine.

This zone is purely dissipative and results in negative or no efficiency.

After completing zone C, the pump experience flow conditions of zone B (normal turbine).

In this zone the pump rotanial speed is now negative forcing the pump to "run away" and the applied torque is positive.