Christophe wrote:Going from 49,8 kN dry to 61,1 kN wet ... It is far from negligible! It is more than 20% gain in push!
By cons I still do not know where the water is injected: before (compression), during (combustion chamber), or after (turbine or fan) combustion?
A priori it will be sufficiently upstream (in any case for Transall engines)
Spraying and mixing a judicious amount of water-methanol, sufficiently upstream in the air stream, allows on the one hand to cool the air mass to bring it back to the standard properties on the other hand to make up for the lost power, without overheating.
http://faq-fra.aviatechno.net/avion/eaumethanol.php
For turbojets (double-flow?), It is post combustion instead of injecting water to have more power ... it must pollute.
https://fr.wikipedia.org/wiki/Postcombustion