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there are stages, fixed blades on the turbine shell and rotating blades on the rotor. They are very close together sooo, because the steam enters at one end of the turbine it heats that area first and it expands the metal there faster than at the other end causing it to rub. if you heat it slowly the turbine casing and the rotor grow at ~ the same rate so the stages don't rub together. If you heat too quickly,by just admitting a high volume of steam, the rotor heats up to fast, because of it has less metal to heat up, it rubs the fixed blades. this is called going long (the rotor is longer than the tolerances between the fixed blades on the casing)
Wiki User
∙ 13y ago
Wiki User
∙ 12y agoIf the steam turbine is not preheated the steam may get condensed after coming in contact with the blades of the turbine.and proper expansion of the rotor and casing.
Wiki User
∙ 12y agoto prevent thermal shock (cracking) when super heated steam hits a cold turbine blade.
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What is the price of a wind turbine?
Grandvalley State University in Allendale, Michigan has developed one for sale that will provide about half the average power needs for a home for about $10,000.
What are software needed to run the computer?
The software needed to run a computer is known as the Operating System. Many hardware platforms allow you to choose between multiple operating systems to suit your needs.
Is it possible to design a wind turbine involving a power electronic converter that will function typically in the US operating at 240V in residential households or in other settings?
Yes. The output voltage will not always be 240 volts - it will fluctuate. Plus a typical wind turbine throws out some harmonics due to the AC/DC/AC design necessary to convert it from speed of blade rotating to a constant 60 Hz. If you are building this all yourself, for you own home use, and especially if you wish to disconnect from the grid, It might be best to build the turbine to AC/DC and charge a battery bank. A reverse charging protection schemed needs to be set up for when the DC voltage dips below the battery voltage (when the wind isn't blowing). A large home-sized DC-AC converter would be used to power the home off the battery bank, then. This scheme would protect the home from the harmonic output from the wind turbine (which could damage sensitive electronics like computers, LCDs, etc.).
Why is system call needed in operating system?
System calls are used whenever a program needs to access a restricted resource, eg a file on the hard disk, any hardware device, or when it needs to print or draw to the screen
Does Energy needs to be converted before it can be used in a technological system?
Yes, usually.
Why the gas turbine needs 3 bucket stages only in 110MW TURBINE?
because all gas turbine has three stage buckets
Why do you need to preheat the oven before baking?
Check the recipe before cooking. Sometimes preheating is, and sometimes is not, necessary.If you need to cook something in the oven for a specific amount of time at a specific temperature, then it must be cooked at that temperature the WHOLE time.If it takes 10 minutes to preheat it to 300 degrees, and you put the food in WITHOUT preheating, you undercook it.And if you out the food in WHILE preheating, you end up overcooking it.
What steps needs for start a steam turbine from cold conditon?
steam turbine cold start up list:
Why must you preheat copper before brazing?
You usually do not braze copper, you solder it. If you were to use brazing rod on copper, the copper would have very close to the same melting point as the brazing rod. This makes it difficult to do. As far as preheating the copper, it needs to be hot enough for the brazing to flow.
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 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.
What determines the type of operating system selected?
The customer's needs.
What are the needs of operating system in a computer?
An operating system provide an interface between the user and hardware. operating system is a platform in which all the user applications can run
Why does your computer switch off after copying operating system files for it to install new operating system?
because it needs to reboot
Ms PowerPoint is considered an operating system?
It is a software application.. Because power point needs operating system to run
How do traveling wind turbine technicians travel?
By the same means any other technician that needs to travel would do so.
Why turbine blades are largenr in size at exhaust end?
Because the steam expands as it passes through the turbine. The steam velocity through the turbine is constant from steam chest to exhaust hood (though it changes in each stage). Thus, the space needed for the steam to expand needs to be expanded to correspond with that expansion of the steam.
