[permalink] [id link]
A turbine is theoretically more reliable and easier to maintain than a piston engine, since it has a simpler construction with fewer moving parts but in practice turbine parts experience a higher wear rate due to their higher working speeds.
from
Wikipedia
Some Related Sentences
turbine and is
* Work is being done in developing ceramic parts for gas turbine engines.
A compound turbine is a steam turbine in which there are two casings, a high-pressure casing and a low-pressure casing, operating in concert to extract work from a single source of steam.
Cogeneration is the practice of using exhaust or extracted steam from a turbine for heating purposes, such as drying paper, distilling petroleum in a refinery or for building heat.
landfill or wastewater treatment plant, with a reciprocating engine or a microturbine, which is a small gas turbine.
Efficiencies can be as high as 65 % when the fuel cell is paired with a turbine, and 85 % if heat is captured and used in a Combined Heat and Power ( CHP ) system.
One product, the DFC-ERG, is combined with a gas turbine and, according to the company, it achieves an electrical efficiency of 65 %.
A tension leg mooring system for a wind turbine: left-hand tower-bearing structure ( grey ) is free floating, the right-hand structure is pulled by the tensioned cables ( red ) down towards the seabed anchors ( light-grey )
The Francis reaction turbine is still in wide use today.
* η is the dimensionless efficiency of the turbine
To illustrate, power is calculated for a turbine that is 85 % efficient, with water at 62. 25 pounds / cubic foot ( 998 kg / cubic metre ) and a flow rate of 2800 cubic-feet / second ( 79. 3 cubic-meters / second ), gravity of 9. 80 metres per second squared and with a net head of 480 ft ( 146. 3 m ).
This force is applied typically to pistons, turbine blades, or a nozzle.
A gas turbine is a rotary machine similar in principle to a steam turbine and it consists of three main components: a compressor, a combustion chamber, and a turbine.
A gas turbine is a rotary machine somewhat similar in principle to a steam turbine and it consists of three main components: a compressor, a combustion chamber, and a turbine.
The air after being compressed in the compressor is heated by burning fuel in it, this heats and expands the air, and this extra energy is tapped by the turbine, which in turn powers the compressor closing the cycle and powering the shaft.
A gas turbine-electric locomotive, or GTEL, is a locomotive that uses a gas turbine to drive an electrical generator or alternator.
A turbine of a given power output is also physically smaller than an equally powerful piston engine, allowing a locomotive to be very powerful without being inordinately large.
turbine and theoretically
In this configuration, the Darrieus design is theoretically less expensive than a conventional type, as most of the stress is in the blades which torque against the generator located at the bottom of the turbine.
turbine and more
2000 KW Curtis steam turbine circa 1905. The first device that may be classified as a reaction steam turbine was little more than a toy, the classic Aeolipile, described in the 1st century by Greek mathematician Hero of Alexandria in Roman Egypt.
A cross compound turbine arrangement features two or more shafts not in line driving two or more generators that often operate at different speeds.
The interior of a turbine comprises several sets of blades, or buckets as they are more commonly referred to.
A turbocharged engine can be more powerful and efficient than a naturally aspirated engine because the turbine forces more intake air, proportionately more fuel, into the combustion chamber than if atmospheric pressure alone is used.
The reverse flow back across the turbocharger causes the turbine shaft to reduce in speed more quickly than it would naturally, possibly damaging the turbocharger.
It may be better locked off or feathered while the towed generator's more efficient turbine gathers energy.
Gas turbine engines operate efficiently at much higher altitudes, are more reliable than piston engines, and produce less vibration and noise.
* 1903: A Norwegian, Ægidius Elling, was able to build the first gas turbine that was able to produce more power than needed to run its own components, which was considered an achievement in a time when knowledge about aerodynamics was limited.
However, the required precision manufacturing for components and temperature resistant alloys necessary for high efficiency often make the construction of a simple turbine more complicated than piston engines.
Turbines have historically been more expensive to produce than piston engines, though this is partly because piston engines have been mass-produced in huge quantities for decades, while small gas turbine engines are rarities ; however, turbines are mass-produced in the closely related form of the turbocharger.
The marine gas turbine operates in a more corrosive atmosphere due to presence of sea salt in air and fuel and use of cheaper fuels.
These advances allowed higher compression ratios and turbine inlet temperatures, more efficient combustion and better cooling of engine parts.
In its first year, the plant produced more than a million precision forged turbine and compressor blades for Avro's Orenda engine.
The original turbine lasted for more than 30 years and produced 11 MW net power.
The Red Hills Wind Farm includes 82 wind turbine generators that produce 123 MW of clean energy, enough to power more than 40, 000 homes.
The high temperatures allow a turbine to extract more mechanical energy from the same amount of thermal energy ; therefore, the power system uses less fuel per kilowatt-hour.
Other turbine types are clogged more easily, and consequently face power losses despite higher nominal efficiencies.
When much more power output is required, the engine speed and throttle opening are increased until the exhaust gases are sufficient to ' spin up ' the turbocharger's turbine to start compressing much more air than normal into the intake manifold.
turbine and reliable
The cornerstone of the ETOPS approach is the statistics that show that the turbine itself is an inherently reliable component, and it is the engine ancillaries that have a lower reliability rating.
* Indar Electric permanent magnet wind turbine generator optimization for reliable operation
turbine and easier
Its simple construction makes it easier to maintain than other turbine types ; only two bearings must be maintained, and there are only three rotating elements.
turbine and maintain
In a turbomolecular pump, a rapidly spinning turbine rotor ' hits ' gas molecules from the inlet of the pump towards the exhaust in order to create or maintain a vacuum.
Typically, an automatic controller operates the turbine inlet valve to maintain constant speed ( and frequency ) when the load changes on the generator.
turbine and than
Whilst this makes the Parsons turbine much longer and heavier, the overall efficiency of a reaction turbine is slightly higher than the equivalent impulse turbine for the same thermal energy conversion.
However, contrary to other designs, large steam volumes are handled with difficulty and only a combination with axial flow turbines ( DUREX ) admits the turbine to be built for power greater than ca 50 MW.
This additional component of motion allowed the turbine to be smaller than a water wheel of the same power.
Since single cycle ( gas turbine only ) power plants are less efficient than combined cycle plants, they are usually used as peaking power plants, which operate anywhere from several hours per day to a few dozen hours per year — depending on the electricity demand and the generating capacity of the region.
The superior power-to-weight ratio of the gas turbine and its fixed speed gearbox, allows for a much lighter prime mover than those in such hybrids as the Toyota Prius ( which utilised a 1. 8 litre petrol engine ) or the Chevrolet Volt ( which utilises a 1. 4 litre petrol engine ).
where the engine's turbocharger is completely replaced with a small gas turbine which also works as an assisted diesel exhaust turbocharger, enabling engine RPM-independent boost level control and a higher peak boost pressure to be reached ( than with ordinary turbochargers ).
It was proved that particular fuel could be used in a marine gas turbine but, savings made were less than anticipated due to increased maintenance requirements.
The peak efficiency of a cross-flow turbine is somewhat less than a Kaplan, Francis or Pelton turbine.
0.781 seconds.