Control valve or distribution valve or relay valve Centrifugal governor or pendulum Piping arrangements Spear rod or needle Gear pump is used here as oil pump in the oil pressure governor. Gear pump will be driven by the power obtained from the turbine shaft. Centrifugal governor or pendulum will be connected with the turbine main shaft with the help of belt or gear. Piping arrangements will connect the oil sump with the control valve and control valve to servomotor or relay cylinder. Following figure displayed here indicates the position of the piston in the relay cylinder, position of control valve or relay valve and fly balls of centrifugal governor, when the turbine is running at the normal speed.
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For simplicity, assume that all of the velocity vectors are parallel to each other. The fluid is assumed to be incompressible an accurate assumption for most liquids. Also it is assumed that the cross-sectional area of the jet is constant. The jet speed remains constant relative to the runner. Optimal wheel speed Edit We know that the ideal runner speed will cause all of the kinetic energy in the jet to be transferred to the wheel. In this case the final jet velocity must be zero.
The torque is maximal when the runner is stopped i. When the speed of the runner is equal to the initial jet velocity, the torque is zero i. On a plot of torque versus runner speed, the torque curve is straight between these two points: 0, pQDVi and Vi, 0. As the equations indicate, when a real Pelton wheel is working close to maximum efficiency, the fluid flows off the wheel with very little residual velocity.
Bucket detail on a small turbine. The conduit bringing high-pressure water to the impulse wheel is called the penstock. Originally the penstock was the name of the valve, but the term has been extended to include all of the fluid supply hydraulics.
Penstock is now used as a general term for a water passage and control that is under pressure, whether it supplies an impulse turbine or not.
What is Governing of Turbine?
Control valve or distribution valve or relay valve Centrifugal governor or pendulum Rotating guide vanes Regulating lever, regulating rod and regulating ring Gear pump is used here as oil pump in the oil pressure governor. Gear pump will be driven by the power obtained from the turbine shaft. Centrifugal governor or pendulum will be connected with the turbine main shaft with the help of belt or gear. Piping arrangements will connect the oil sump with the control valve and control valve to servomotor or relay cylinder. Rotating guide vanes control the flow rate of water flowing to turbine. Servomotor piston will be connected with the regulating lever and this regulating lever will be connected with the two regulating rod.
GOVERNING MECHANISM OF PELTON TURBINE PDF
Nakora The crest of spillway is kept at full reservoir level. Left hand end of the main lever lowers down, 4. This governinf gives better performance since the force required for operation of Francis turbine guide vanes is much more compared to Pelton turbine. The process of providing any arrangement which will keep the speed constant and will regulate the rate of flow as per variation in load. Hydropower Engineering — ppt video online download The piston in the control valve moves upward in the cy binder, 5.