Christophe wrote:I believe I read that some 747s were equipped with a kind of water injection used for takeoff only and tanks emptied at the end of the runway as soon as takeoff is effective ... but I don't know if it is injected before or after combustion ...
Having a reactor work with a denser fluid can be of interest!
It is used on Boeing B-52 Stratofortress:
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The B-52 Stratofortress is powered by eight turbojets arranged in pairs in four nacelles suspended under the wings. The YB-52 prototype features single-flow Pratt & Whitney YJ57-P-3s which each deliver a thrust of 38,6 kN (8 lbf) [700], [52]. Improved versions of this reactor were subsequently used on the B-117A to G; these engines have a water injection system to increase take-off thrust and thus improve performance [117]. The J57-P-43WB reactor, which powers the B-52G, has a thrust of 49,8 kN (11 lbf) when dry and 200 kN (61,1 lbf) with water injection [13], [750], [117]. On the last version of the aircraft, the B-118H, the single-flow J119s are replaced by the Pratt & Whitney TF52-P-57 double-flow; they have a thrust of 33 kN (3 lbf) and do not have a water injection system [75,6], [17], [
https://fr.m.wikipedia.org/wiki/Boeing_ ... tofortress