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In a wind turbine - does increasing the blade length or decreasing the blade length increases the speed of the turbine?
Decreasing the blade length will increase the rotation speed, and thus the turbine speed ( for constant wind speed ).
What is second critical speed of turbine?
Critical speed means where natural frequency is equal to system frequency.
What does self-sustaining speed in a gas turbine Mean?
Self-sustaining speed in a gas turbine refers to the operational condition where the turbine can generate enough thrust and power to maintain its own rotational speed without external assistance. At this point, the energy produced from the combustion process matches the energy losses due to friction and other factors, enabling the turbine to operate efficiently. Achieving self-sustaining speed is critical for the turbine to transition from startup to stable operation.
Difference between francis and kaplan turbines?
The comparison kaplan and francis hydro power turbine is as under: 1. Efficiency of Kaplan hydro power turbine is higher. 2. Kaplan turbine is more compact in cross-section and has higher rotational speed to that of francis hydro power turbine. 3. In Kaplan turbine, the water flow is axia and in francis trubine it is radial. 4. The runner blades in the kaplan turbine is less in number. 5. Specific speed of Kaplan turbine is 2 to 3 times that of Fancis turbine. 6. Friction loss in Kaplan turbine is less. 7. Francis turbine requires medium head while Kaplan trubines are low head hydro power turbines.
What is power-to-weight ratio of steam turbine and gas turbine?
there is a mathematical formula to figure the actual power measured in Inchpounds of torque for both types of turbine engines. due to the light weight of the engine and the very high speeds in which they operate they are very efficient compared to other type of power plants generally the rough power to weight ratio of a typical aircraft turbine engine is around 85 to 95% output power compared to the actual weight of the type engine used.the exception to this would be a turbo-fan engine used on high speed aircraft which the power output is measured in footpounds of thrust
How does EGT and gas generator speed in a free power turbine with a constant speed propeller behave when power setting is increased?
As power setting is increased in a free power turbine with a constant speed propeller, EGT (exhaust gas temperature) will rise due to increased fuel flow and combustion in the engine. Gas generator speed will also increase to maintain power output and drive the propeller at a constant speed. The engine and propeller system will work together to balance power output and propeller speed.
In a wind turbine - does increasing the blade length or decreasing the blade length increases the speed of the turbine?
Decreasing the blade length will increase the rotation speed, and thus the turbine speed ( for constant wind speed ).
What is the most important of the turbine used in a power station?
Keeping the speed constant is vital if the turbine is to deliver power synchronised with other turbines supplying the 'grid'. If it remains 'on line 'and 'out of phase ' with the 50/60 Hz AC frequency of the grid it will be destroyed.
What is second critical speed of turbine?
Critical speed means where natural frequency is equal to system frequency.
What should be the speed for 2kw wind turbine to get 2kw power?
It depends on the manufacture and design of the wind turbine. Some small turbines can maximize power output with a wind speed of 10 mph. Larger turbines may be designed for higher wind speeds. Some won't even start spinning until the wind speed is over 10 mph.
Is it true that the faster the propeller turns on a wind turbine the more electricity it makes?
No, in fact if the wind is strong enough, wind turbines can take power from the grid to help slow the blades down. Modern wind turbines have constant speed blades on them which vary the power to the hub for a given wind speed and keep the blade speed constant. Thus more power may happen at the same blade speed as low wind situations. Often higher blade speeds indicate that the turbine is in idle mode and not producing any power for the grid. Power is cubed so the power available is dependent on the wind solely. A 28 MPH steady wind will allow production of power at 100%. If the wind goes much above this speed, a shut down occurs. If the wind is at 14 mph, the power available is 10% of rated. Speeds of wind systems on the grid should be fairly constant. despite power setting.
What is governing of impulse turbine?
Basically governing of a turbine is controlling the speed of the turbine as the load keeps varying. The turbine needs to rotate at a constant speed. The governing of an impulse turbine is done by varying the jet of water that hits the buckets of the runner. This is done by using a spear arrangement in the pen stock. A pen stock is a type of pipe that provides the jet of water.
What is idle speed of turbine?
warm up speed of turbine,andthe minimum speed of turbine before loading is called idle speed.
What is governing of turbines?
Basically governing of a turbine is controlling the speed of the turbine as the load keeps varying. The turbine needs to rotate at a constant speed. The governing of an impulse turbine is done by varying the jet of water that hits the buckets of the runner. This is done by using a spear arrangement in the pen stock. A pen stock is a type of pipe that provides the jet of water.
Why we use of governor in thermal power plant?
The speed sensitive governor on the steam turbine operates by detecting changes in speed from the normal 60 Hz (or 50 Hz in Europe and other countries). This is to try to keep grid frequency constant, or more constant than otherwise. Thus if an extra load is suddenly put on the grid, the frequency falls, the turbine governors all see this and respond by opening the steam valves to compensate. The opposite happens if a load is suddenly shed. Sudden drops in frequency can also occur if a generating unit trips out, and the governors then respond to make up the deficit. It's not the complete answer though, and the grid control centre will also get involved and probably ask certain generators to adjust their output. This is why you always need to have some units on line that are not being already run at their maximum possible output.
How do you calculate critical speed of turbine?
The critical speed of a turbine can be calculated using the formula: ( V_{critical} = \sqrt{\frac{g \cdot R}{k}} ), where ( g ) is the acceleration due to gravity, ( R ) is the radius of the turbine rotor, and ( k ) is a constant that accounts for the mass distribution and stiffness of the turbine structure. This speed represents the frequency at which the natural frequency of the turbine matches the operational frequency, potentially leading to resonance and excessive vibrations. It is crucial to ensure that the operational speed remains below this critical speed to maintain stability and prevent mechanical failure.
What is critical speed of steam turbin?
Answer:Turbine shaft material has its own natural frequency, when turbine rotates on such a speed that frequency of shaft become close to its natural frequency, machine causes noise & high vibrations because of resonance due to matching of frequency. Running of Steam "TURBINE" on this speed is avoided & this is called Critical speed. A turbine may have more then one critical speed, which may depend upon number of couplings.A second critical speed is when the Turbine blade tips approach the speed of sound. This effectively limits the speed of a turbine and explains why power plants tend to have turbines of the same capacity.Critical speed of the turbine is the rotor speed at which natural frequency of the assembled rotor (rotor shaft with discs, blades, shrouding strips etc in assembled condition) becomes equal to the operating speed. This is usually a expressed as a range (critical speed range).There are multiple critical speeds. However, the operating speed of the turbine may be above or below the first / lowest critical speed. Accordingly it is called as a flexible or a rigid rotor.Venkatesh
