Originally Posted by
megan
Shaft bow is a problem on larger turbines, ships and power station turbines are fitted with an electric motor, known in the industry as "turning gear", to keep the turbine slowly rotating to prevent bow when shut down.
Yes, the issue here comes from the output shaft of the engine is in front, engines mounted rear.
The output shaft is the inner shaft and the shaft connecting the compressor and turbine is therefore hollow, making it possible to get one side of the shaft hot and the other cold = bent by different temperatures.