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- This is a variant of Pelton turbine and Turgo turbine was developed at 1919’s by Gilkes Energy Company.
- Turgo turbine is an impulsive water turbine and handles flow rates more than the flow rates of Pelton turbine handles.
- The main difference between a Pelton turbine and a Turgo turbine is that Turgo turbines use single cups instead of double cups on the wheel, and these cups are more shallow.
- This is having slightly less coefficient as compare to another turbine.
Since the runners on these turbines are smaller and faster spinning, some Turgo turbines can be connected directly to a generator instead of having to use a speed-increasing transmission.
Main Component of Turgo Turbine:
The components are similar to as having the Pelton wheel turbine.
2. Runner and buckets
3. Casing and
4. Breaking jet
The amount of water striking the buckets of the runner is controlled by providing a spear in the nozzle. The speed is a conical needle which is operated either by a hand wheel or automatically in an axial direction depending upon the size of the unit. When the spear is pushed forward into the nozzle and the amount of water striking the runner is reduced. On the other hand, if the sphere is pushed back, the amount of water striking the runner increases.
2. Runner and buckets:
The runner or blade consists of a circular disc on the Periphery of which a number of buckets evenly spaced are fixed. The Shape of the bucket is of double hemispherical cup or bowl. Each bucket is divided into two symmetrical parts by a dividing wall which is known as a splitter.
The function of the casing is to prevent the splashing of the water and to discharge water to tailrace. It also acts as a safe ground against accidents. It is made of cast iron or fabricated steel plates.
4. Breaking jet:
When the nozzle is completely closed by moving the spear in the forward direction, the amount of water striking the runner reduces to zero. But the runner due to inertia goes on revolving for a long time. To stop the runner in a short time, a small nozzle is provided which directs the jet of water on the back of the vanes. This jet of water is called breaking jet.
A Turgo runner looks like a Pelton runner split in half. For the same power, the Turgo runner is one half the diameter of the Pelton runner, and so twice the specific speed. The Turgo can handle a greater water flow than the Pelton because exiting water doesn’t interfere with adjacent buckets.
The working operation of a Turgo turbine is very similar to the Pelton turbine. In this Turgo turbine, high-speed jets of water emerge from the nozzles that surround the turbine. These nozzles are arranged so the water jet will hit the buckets on one side at an angle of around 20°. This shallow angle allows the water stream to exit on the other side instead of being diverted backward. Since the incoming and outgoing jets don’t interfere as they do in Pelton turbines, this Turgo turbine is able to accommodate a higher flow rate.
Advantages and Disadvantages of Turgo turbine:
- Turgo turbine is very easy to assemble.
- There is no cavitation because water jet strikes only a specific portion of the runner.
- It has fewer parts as compared to Francis turbine which has both fixed vanes and guided vanes.
- The overall efficiency of the Turgo turbine is moderate.
- Turgo turbine, both first law and the second law of motion are applied.
- The Turgo Turbine size runner, generator and powerhouse required is large.
- The variation in the operating head is little difficult to control because of moderate heads.
Application of Turgo Turbine:
Turgo Turbine is the preferred turbine for hydropower when the available water source has a relatively high hydraulic head at low flow rates.
In a hydroelectric power plant, This is used to drive the generator of the turbine and that generator generates the mechanical energy of the turbine into an electrical energy.
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