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COMBUSTION IN GAS TURBINE

08/27/2008 1:26 AM

HI TO ALL

SOME OF GAS TURBINES ,(EX. MODEL MW701D WESTINGHOUSE TYPE, MADE BY MITSUBISHI)DOES NOT HAVE A MECHANICAL FLOW DIVIDER NEITHER FOR "FUEL OIL" NOR FOR "FUEL GAS".THERE IS ONLY A CIRCULAR HEADER FOR FUEL OIL AND A CIRCULAR HEADER FOR FUEL GAS. ENTRANCE OF FUEL OIL TO GAS HEADER IS THROUGH ONE POINT AND FOR FUEL OIL THROUGH 2 POINT.HOW DOES FUEL DIVIDE EQUALLY TO 18 NOZZLE?NOZZLES ARE THE SAME?

THANKS

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Guru
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#1

Re: COMBUSTION IN GAS TURBINE

08/27/2008 4:40 AM
  1. Please turn off Caps Lock. Many readers consider capitals use to be akin to SHOUTING, and very rude.
  2. Why does the flow need to divide equally to 18 nozzles?
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#2
In reply to #1

Re: COMBUSTION IN GAS TURBINE

08/29/2008 4:18 AM

Thank you and sorry.

If the flow is not equall ,logically the fuel air ratio will be different and resultly the combustion temp. will get different and finally causes termal stress in hot parts(vanes, blades and so on.)Then it seems ,to be equall is important to fuel flow!

Thanks again

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Anonymous Poster
#3
In reply to #2

Re: COMBUSTION IN GAS TURBINE

09/01/2008 2:20 PM

Please remember all the parts that will be subject to high heat are rotating. So with that said, it realy does not matter.

Gas turbines are wonderfuly simple and quite often overthought.

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#4
In reply to #3

Re: COMBUSTION IN GAS TURBINE

09/03/2008 1:00 AM

Thank you for taking part in discussion,

BUT;

I think rotation is exactly "the problem maker in this case", becuse : suppose the speed is 3000rpm and supposing the temperature difference between two combustion temperature is 100 degree.This means the blades row no. 1 (and the other rotating rows in other measure proportion to their row as well) expose to this temperatur difference 3000 times in one minute or 50 times in a second.Dosnt this temperature fluctuation cause thermal stress?

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