What type of governing is used in an impulse turbine?

In an impulse turbine, both nozzle and throttle governing are utilized to control the flow of steam or water entering the turbine.

Nozzle governing involves adjusting the nozzles that direct the working fluid onto the blades of the turbine. By changing the size of the nozzle openings, the amount of fluid entering the turbine can be controlled, which directly affects the power output and efficiency of the turbine. This is particularly important in impulse turbines, where the jet of fluid strikes the turbine blades and causes them to rotate.

Throttle governing, on the other hand, involves controlling the flow of the working fluid by adjusting the throttle valve, which regulates the flow rate into the turbine system. This type of governing is used to maintain stable operation under varying load conditions. By throttling the input, you can prevent surges in power and maintain desired operational parameters.

By combining both methods—using nozzles for precise control of the steam or water jet and throttling to manage the overall flow rate—it is possible to achieve more effective regulation of turbine performance. This dual approach allows for improved efficiency and power management in impulse turbine operations.