Hesselman heavy-oil high-compression engine Page: 4 of 26
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N.A.C.A. Technical Memorandum No. 312
eliminate the cooling effect of the blast air.
Since solid injection of the fuel saves the work of the corm-
pressor, the mechanical efficiency of the engine is improved.
It has not always been taken into consideration, however, that a
portion of the compressor work is recovered through the expansion
of the blast air in the cylinder, so that this improvement in the
efficiency does not generally amount to more than 3 or 4%. The
useful work, performed by the blast air in the engine cylinder,
results, moreover, in an apparently more favorable fuel consump-
tion. Since this is generally taken as the gage of the efficien-
cy of the combustion, we cannot, as has hitherto often happened,
disregard the fact that, with the same fuel consumption per
horsepower, the heat from the fuel is utilized from 3 to 4% bet-
ter in a solid-injection engine than in an ordinary Diesel engine.
Fuel Pump.- The difficulties of solid injection (namely,
to introduce the fuel into the cylinder gradually, without vio-
lent increase in pressure, and to mix it simultaneously and thor-
oughly with the air) can be best illustrated by a concrete ex-
ample. The example chosen is the successful engine (Figs. 1-2)
designed by myself, a large part of the results obtained with it
being capable, however, of universal application. Worthy of
note, among other things, is the construction of the fuel pump,
which, even in engines with several cylinders, has only one pis-
ton p. This piston must therefore make as many strokes as there
are ignitions in the engine. The pump has only one intake valve,
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Hesselman, K. J. E. Hesselman heavy-oil high-compression engine, report, April 1, 1925; (digital.library.unt.edu/ark:/67531/metadc59074/m1/4/: accessed July 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.