Download: Vernet Clerget patent, water injection on Diesel engine

Patent of 1er stationary French diesel engine filed in 1901 by Pierre Clerget and Arthur Vernet (publication number GB190104220)

The particularity of this engine is to include a triple injector, making it possible to make “mixtures” of fuel, oxidizer and liquid catalysts and in particular water with more or less heavy oil which has the effect of largely promoting combustion. .

P. Clerget was a genius engine engineer. He later turned to nascent aviation and developed efficient gasoline engines there. It will even make some diesel aviation engines during the 1930s (Clerget 9A, 9B, 14D…). What was, and still remains (given the rarity of diesel engines in the air), a technological feat!

- History of water injection in engines
- Interest and realization of water injections
- Water injection in heat engines using the Gillier-Pantone system
- Water injection in aviation

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1 comment on “Download: Vernet Clerget patent, water injection on Diesel engine”

  1. Contrary to what Mr. Clergé's patent application says in English, I do not think that the maximum temperature prevailing in the cylinder of a gasoline engine is sufficient to dissociate oxygen from hydrogen from water.
    Moreover, this operation would be without energy interest since it would be necessary to provide as much energy for this dissociation as would be recovered by combustion.
    On the other hand, at the same temperature, especially if it is relatively low but above 300 ° C, the expansion of water vapor is much greater than that of air. This results in greater pressure on the piston, all other things being equal, and therefore greater efficiency.
    Diesel engines reject soot micro-particles because they are adjusted so that combustion is incomplete because then the temperature is too low for very toxic nitrogen compounds to form. But this carbon released into the particulate filter is wasted, wasted fuel.
    The efficiency would be better if the combustion were complete but an injection of water by cooling the temperature of the cylinder prevents the formation of nitrogen oxides while increasing the pressure on the piston free of charge.
    This system could be used on aircraft engines. But the weight of the water to take away would risk making the operation less interesting.
    Since water evaporation is particularly calorie-intensive, it would be preferable for the injected water to be as hot as possible: given the pressure in the cylinder, it could be over 100 ° C, previously heated by the engine. itself (special high pressure radiator).
    It is of course necessary to use completely demineralized water.
    When starting a diesel engine from cold, since the cylinder walls are responsible for cooling the gases below the temperature at which nitrogen oxides are formed, the injection of water can be dispensed with.

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