Beatrice Lang
Generating electricity with a turbine is a common method used in power plants worldwide. Turbines convert kinetic energy into electrical energy through electromagnetic induction. This process involves spinning rotors that drive generators, with the rotation creating an electrical charge by inducing voltage differences within the conductor. Gas turbines, or combustion turbines, use the ignition of compressed air and fuel to create high-temperature, high-pressure gases that spin the turbine blades. Steam turbines operate similarly but use pressurised steam instead of combustion gases to rotate the blades. Wind turbines, another type of electricity-generating turbine, use aerodynamic force from rotor blades to turn wind energy into electricity.
| Characteristics | Values |
|---|---|
| Types of Turbines | Steam, combustion (gas), hydroelectric, wind |
| How it works | A moving fluid (water, steam, combustion gases, or air) pushes a series of blades mounted on a rotor shaft. The force of the fluid on the blades spins the rotor shaft of a generator. The generator, in turn, converts the mechanical (kinetic) energy of the rotor to electrical energy. |
| Wind turbines | Use aerodynamic force from rotor blades, which work like an airplane wing or helicopter rotor blade. |
| Wind turbine types | Horizontal-axis, vertical-axis |
| Wind turbine wind speed | Operate between 7mph (11km/h) and 56mph (90km/h). Efficiency is maximized at 18mph (29km/h) and they reach maximum output at 27mph (43km/h). |
| Steam turbines | Use a boiler where fuel is burned to produce hot water and steam. The steam powers a turbine that drives a generator. |
| Gas turbines | Consist of a gas compressor, a combustion chamber, and a turbine. Air enters the compressor, where it is compressed and mixes with fuel, usually natural gas. The mixture ignites, creating high-temperature, high-pressure gases that spin the turbine blades. |
| Electricity generation | The spinning of the turbine moves magnets through coiled cables, generating electricity. |
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What You'll Learn
Gas turbines
The basic operation of a gas turbine involves three main sections: the compressor, the combustion system, and the turbine. Firstly, the compressor draws in air, pressurizes it, and feeds it to the combustion chamber at high speeds. Then, in the combustion system, a steady stream of fuel is injected into the combustion chamber, where it mixes with the air and ignites, producing a high-temperature, high-pressure gas stream. Finally, this hot gas stream enters and expands through the turbine, causing the blades to spin.
The spinning turbine blades perform two functions. Firstly, they drive the compressor to draw more pressurised air into the combustion section. Secondly, they spin a generator to produce electricity. The generator converts the mechanical energy of the spinning turbine into electrical energy.
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Steam turbines
The first device that may be classified as a reaction steam turbine was the classic Aeolipile, described in the 1st century by Hero of Alexandria in Roman Egypt. In the 19th century, several inventors designed and built steam turbines, including Taqi al-Din in Ottoman Egypt (1551), Giovanni Branca (1629), John Wilkins in England (1648), Ferdinand Verbiest (1672), and an unknown German mechanic (late 18th century). In 1807, Polikarp Zalesov designed and built an impulse turbine, and in 1888, Swedish engineer Gustav de Laval designed another. However, it was Parsons' steam turbine that revolutionized electricity generation, making it cheap and plentiful.
A steam turbine is typically linked to a generator. Once the rotational energy is produced, it is used to generate electricity through the attached generator. Steam turbines offer high levels of efficiency when it comes to power generation and are heavily used in different industries. They are commonly used for combined heat and power (CHP) systems, which are used to power industrial processes under conditions where waste fuels are available for the boiler to utilize. When used for CHPs, the steam emitted by the steam turbine can be used directly. Steam turbine-powered CHPs are typically found in paper mills and chemical plants.
The steam turbine works by forcing a high-pressure stream through multiple sets of blades and generating energy in doing so. The steam then goes back into an intermediate pressure section of the turbine and continues its expansion. Using reheat in a cycle increases the work output from the turbine and also the expansion reaches a conclusion before the steam condenses, thereby minimizing the erosion of the blades in the last rows.
The rotation of the turbine blades also generates electricity through electromagnetism. When a turbine spins, it moves magnets through coiled cables, generating electricity. When electricity is moved through coiled cables, it moves magnets.
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Wind turbines
Wind power has grown significantly in recent decades. In 2022, wind turbines were the source of about 10.3% of total U.S. utility-scale electricity generation. The UK government plans to invest in offshore wind power to ensure the country produces enough electricity to power every home by 2030. Wind is expected to be a dominant source of electricity supply in the future, along with other zero-carbon sources.
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Electromagnetism
The generation of electricity using turbines is based on the principles of electromagnetism, as discovered by Michael Faraday in 1831 (or 1832 by one account). Faraday found that passing a magnet through a coil of wire induces an electric current. This relationship between magnetism and electricity led to the design of the electromagnetic generators used today.
Electromagnetic generators use an electromagnet, which is a magnet produced by electricity, not a traditional magnet. A basic electromagnetic generator consists of a stationary cylinder, called a stator, which is formed from a series of insulated wire coils. This surrounds an electromagnetic shaft, called a rotor. When the rotor turns, an electric current flows in each section of the wire coil, and each section becomes a separate electric conductor.
In the context of turbines, the rotating blades spin the generator's magnet, producing a powerful flow of electrons. This process converts mechanical energy into electrical energy. The faster the turbine spins, the greater the electrical output. Turbine blades are rotated by a moving fluid, such as water, steam, combustion gases, or air.
There are several types of turbines that use electromagnetism to generate electricity. These include steam turbines, combustion (gas) turbines, hydroelectric turbines, and wind turbines. Steam turbines are the most common globally, accounting for about 42% of U.S. electricity generation. Wind turbines, meanwhile, use the power of the wind to rotate the blades of a rotor to generate electricity. They can be installed on land or offshore, where they can capture powerful ocean winds.
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Conversion of kinetic energy
The conversion of kinetic energy is a crucial process in generating electricity using turbines. This process harnesses the power of moving fluids, such as water, steam, combustion gases, or air, to rotate a series of blades mounted on a rotor shaft within the turbine.
In the context of wind turbines, the kinetic energy of the wind is captured by the propeller-like blades of the rotor. The wind flow causes a difference in air pressure across the two sides of each blade, creating both lift and drag. The force of the lift is greater than the drag, resulting in the rotor spinning. This spinning motion, or rotational force, is then transferred to a generator, either directly or through a shaft and gears, to produce electricity.
Similarly, hydroelectric turbines utilise the kinetic energy of moving water to spin their blades and power a generator. Most hydroelectric power plants use water stored in reservoirs or diverted from rivers or streams. This spinning motion, driven by the force of water, ultimately results in the conversion of mechanical kinetic energy into electrical energy.
The conversion of kinetic energy is also evident in steam turbines, which are the most common type of turbine used in power generation. Steam turbines harness the expansion of hot gases or steam to rotate the blades. This rotation is then used to spin magnets within coils of wire, generating electricity through electromagnetic induction.
The fundamental principle behind these turbines is the conversion of kinetic energy into electrical energy. This process involves harnessing the power of natural sources, such as wind, water, or steam, and translating it into the rotational motion of a generator, thereby producing electricity. This conversion plays a vital role in providing sustainable and environmentally friendly solutions to meet our global energy demands.
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Frequently asked questions
A turbine is a device that harnesses the kinetic energy of a fluid, such as water, steam, air, or combustion gases, and turns it into the rotational motion of the device itself.
A turbine generates electricity by spinning rotors, which drive generators through electromagnetic induction. The spinning of the turbine moves magnets through coiled cables, generating electricity.
Different types of turbines include steam turbines, combustion (gas) turbines, hydroelectric turbines, and wind turbines.
Wind turbines use the power of the wind to move the blades of a rotor to power a generator. The difference in air pressure across the two sides of the blade creates lift and drag, with the lift force being stronger than the drag force, causing the rotor to spin.
Hydroelectric turbines use the force of moving water to spin turbine blades to power a generator.
