I was wondering does a compressor variable geometry and a inlet variable stator vane share any similarities or does these terms have same meanings?
I did some digging and all I could find is that CVG is most applicable to turbochargers like the ones you'd find on cars.
However, the term 'CVG scheduling and control' was mentioned as part of a FADEC control output in my gas turbine engine module.
It states that "the FADEC stores a schedule of CVG position versus corrected N2 so as to achieve optimum compressor efficiency. CVG position feedback fed from the CVG actuator on the engine is compared with the CVG demand to achieve a closed loop control. Thus, the inlet guide vanes and the first 5 stages of the CVG are controlled"
This statement rises another question because I do understand that a inlet variable stator vane can aid to change the angle of the incoming air which is passing through the engine and therefore it can manipulate the pressure which is at the inlet and this VSV are controlled by actuators (purposely to minimise compressor stalling effect).
Now how does the CVG fit into this context, is it a system that is solely utilized by the FADEC in order optimise the AOA of the IVGVs? And if so, why is that if the total engine pressure exceeds its limit(which I know that in such condition the EGT has increased), the CVG would be turned off to compensate for air control. Shouldn't the Fuel control unit decrease the flow of fuel into the burners?
I know these is quite a mouthful but if any one can answer or at least shine some light I'd appreciate it.