Water-methanol injection

Used mainly in the military field, the injection of a mixture water-methanol in an engine makes it possible to increase the power of this one in way temporary. It makes following the experiments on the Injection of water in the engines.

Principle

This technique is used since the Second world war to provide a supplement of power at the time of typical locations:

in aerial combat for a Fighter plan
to facilitate takeoff with a strong load of a bomber or a Transport aircraft
or simply to compensate for the loss of power engine caused by a high room temperature and/or a high altitude of takeoff.

One uses a proportioned mixture with approximately water 50% and 50% of Méthanol. Methanol increases the calorific value of kerozene. Water makes it possible to limit the increase in temperature and increases the density of the combustible mixture, which causes to improve the output of combustion. The increase in power is approximately 15%.

On the engine spark-ignition , the mixture is in general injected directly into the combustion chamber. On the Turbopropeller S and Turbojet S, the mixture is injected into the vein of air intake of the engine.

Uses

During the Second world war:

on the German engine dB 605 in particular equipping the Messerschmitt BF109 and BF 110
on the German engine BMW 801 equipping the Focke-Wulf FW 190
on the engine Pratt & Whitney R-2800-59 equipping the Republic P-47 Thunderbolt (starting from version P-47D)

Just after the Second world war:

on the engine Pratt & Whitney J57 equipping the Boeing B-52 Stratofortress
on the engine General Electric J-47 equipping the Boeing B-47 Stratojet

In years 1960/1970:

on the turbopropeller Rolls-Royce Dart RD21 of the Bréguet Trade wind
on the turbopropeller Rolls-Royce the Tyne 22 of the transport aircraft C-160 Transall
on the engine Rolls-Royce Pegasus of the fighter on vertical takeoff Hawker Siddeley Harrier

See too

Injection of water in the engines

External bonds

Description of the system of injection water-methanol of C-160 Transall

Category: Spark-ignition engine

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