which is better "single shaft or duble suft gas turbine"?

Answer 1

Double shaft is better,Cuz First stage turbine will take care of Axial air Compressor and other auxiliaries like lube, control oil pups,and the second stage turbine will be used for your process compressors.The advantage is u can have wide range of speed in your second stage ie in the process without affecting the auxiliaries.

But in case of GTG they may need constant speed for the synchronization in that case.they will use the single stage.. ..

I believe so

Answer 2

I assume by double shaft you mean a gas turbine where the initial turbine stages are on the same shaft and driving the gas turbine compressor and subsequent turbine stages are on a different shaft and driving another piece of machinery or a generator. It is my understanding that this arrangement applies when using aero engine derivatives and will not affect things like bearing design and vibrational characteristics of the aero engine. One can have confidence in great reliability and long life (if it is derated slightly) with a well tested engine. These days though the power requirements for power generation or large gas compressors have moved beyond the power attainable from even the largest aero engines and specifically designed for industrial use gas turbines have emerged in large sizes.

Answer 3

Dual shaft is better for efficiency. What happens is one shaft connects the first stage compressor with the first stage turbine and the other shaft connects the second stage compressor with the second stage turbine. This is desirable particularly in aircraft engines where maximum efficiency is needed.

Answer 4

Was on YA for something unrelated, then this topic was shown on the sidebar...