Are you looking to know about the Classification of turbines?
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What is Turbine?
A turbine is a mechanical device that is used to produce continuous mechanical power in which there is a wheel or rotor typically fitted with vanes.
The water, gas, steam, air and other fluid strike on the vanes to produce power, this type of machine is called a turbine.
After knowing the basic definition of the turbine, let’s dwell on the mainstream of this session.
Classification of Turbines-
Here are some basic types of turbines-
- Water turbine
- Steam turbine
- Gas turbine
- Wind turbine
A rotary mechanism that converts the kinetic energy of water into mechanical energy, known as a water turbine. Basically changing of energy happens with the help of water, that’s why it’s known as water turbine.
Water turbines basically classified into two types –
- Impulse turbine
- Reaction turbine
High force fluid travels through a narrow nozzle and strike onto the turbine blades to make them rotate. That’s the basic mechanism of an impulse turbine.
The bucket shape blade is mounted in the impulse turbine to grab the maximum amount of fluid at a certain angle when high-speed fluid is struck on the blade through the stationary nozzle.
Impulse turbine is further classified into two categories-
- Pelton turbine
- Cross-flow turbine
Pelton turbine is invented by Lester Ella Pelton in 1870 and it is used for high head, low flow power plants.
Spoon shaped bucket is mounted on the turbine runner to redirect the forceful, high-speed water exerting from the nozzle to rotate the drive wheel against the rotary series.
When the high-speed water hits the buckets blades, blades start to move in the anti-clock direction.
Pelton wheel operates best with a drop height of 50-2000m and flow rate of 4-15m3/s.
Crossflow turbine is developed by Anthony Michel in 1903 and it is used in low heads usually 10-70 meters with a power output of 5-100kW.
This turbine gets the energy by reducing the velocity of water but pressure remains the same and that’s why cross-flow turbines are a good example of impulse turbines.
Reaction turbines are those that generate torque by reacting to pressure or accelerating water flow.
As the name suggests, a Reaction turbine works on the principle of reaction force which can be experienced by the turbine blades when water flows over them.
In the reaction turbine, the first set of blades are fixed and they convert water pressure energy into kinetic energy.
Water then moves through the moving or runner blades. The moving blades have the shape of an aero-foil.
When waterfall over it, because of its shape there is a reduction in pressure and also change in velocity and hence water exerts force indirectly on the blades and this force rotates the turbine blades.
The commonly used Reaction turbines are-
- Francis Turbine
- Kaplan Turbine
The main components of the Francis turbine are-
- Volute casing
- Runner blades
- Guide vanes
- Draft tube
From the cashing, water falls through the guide vanes, Blade are arranged periphery to guide the water to the runner blades.
Through the guide vanes, water enters radially into rotors blades. The runner of the Francis turbine has special construction.
When the water enters radially, it starts rotating because of the pressure difference created by the aero-foil structure.
During the process, the entire pressure energy of water is converted into kinetic energy so the water after passing the runner process low pressure.
The kinetic energy is also converted by the reduction in velocity when it flows over the blades. It is the net pressure difference from the inlet to the outlet which determine the energy from the turbine.
In the Kaplan turbine, Water enters through the casing and flow through the guide blade.
Water enters into the runner blades in the axial portion. The runner blades are designed in specific aero-foil structures like the Francis turbine.
But the shape of the blade is a bit differently. The blades are a bit lengthy and curved.
Water hits the runner blade and exhales the thrust on it. This causes its rotation. The water after imparting the energy. then water flows axially out of the turbine and into the draft tube.
Steam turbines basically convert thermal energy in steam into mechanical energy and are further used to generate electricity.
It was invented by Sir Charles persons in 1884.
Flow Energy → Mechanical Energy
The essential material used to generate steam in turbine are basically coal and nuclear fuel to further generate electricity in thermal power plants.
A gas turbine, also called a combustion turbine, is a type of internal combustion engine. Fresh atmospheric air flows through a compressor that brings it to higher pressure.
Energy is then added by spraying fuel into the air and igniting it so the combustion generates a high-temperature flow.
Natural Gas → Mechanical Energy
Natural gas or liquid fluid is converted into mechanical energy using gas turbine and further mechanical energy is used to generate the electricity to lights up home and businesses even to power aircraft, trains, ships, electrical generators and even tanks.
As the name suggests, generation of power using wind or a wind turbine is a device that converts kinetic energy from the wind into electrical power.
The basic principle of wind energy is simple- A series of sails and blades mounted around the rotor catch the wind and translate its kinetic energy into rotational energy and thus creates electricity.
”The wind is an untamed and unharnessed force”
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Want to read more? Here are some suggested articles, you should read further-
- Lancashire Boiler
- Locomotive boiler
- Benson Boiler
- Velox Boiler
- LaMont Boiler
- Loeffler Boiler
- Schmidt Hartmann boiler
Thank you for being with me. I hope to see you in the next session.
Here is your gift, which I promise to give at the end of the article. So, here it is-
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Abhishek Tiwary is a blogger by passion and a Quality Engineer by profession. He has completed his B.Tech degree in the year of 2017. Now working in a reputed firm and He loves to share his knowledge with others.