Is water injection a redundant technology?
Apologies for going over an old subject, couldn't find a suitable old thread to resurrect that wasn't closed.
I'm doing some work on a course manual which must include water injection systems but, whilst I understand how they work, am beginning to question the relevance of the subject (as a thrust augmentation mechanism) to todays aircraft. I know the Harrier has a water injection system but understand that later evolutions of the Pegasus are sufficiently powerful as to be able to operate without water injection at all.
So, does anything still use water injection, or water/meth injection as a thrust recovery/augmentation system or am I simply recounting history.
Many thanks