naca-wr-e-199
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- April 15, 2017 Create Date
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Nitrous Oxide Supercharging of an Aircraft-Engine Cylinder
A numeer of investigations have been conducted to determine
the effectiveness of oxygen supercharging of military aircraft
engines, particularly for momentary bursts of power at high alti-
tudes. (See references 1 and 2.) The tests of reference 1 showed
that, although the addition of oxygen supplied considerable extra
power, thv effect on the knock limit and on engine temperatures
was detrimental unless large quantities of internal coelants were
injected.
Recently the Lir Technical Service Command, Army Lir Forces,
requested the NACA to conduct tests using nitrous oxide to provide
additional oxygen for supercharging. Data obtained from the irmy
Air Forces indicated that this compound was selected in an attempt
to obtain the benefits of oxygen supercharging without incurring
any reduction of tho knock limit. It was understood that the
tests should be applicable insofar as possible to the in-line
liquid-cooled engine with a_1650-oubic—inch displacement installed.
in a pursuit airplane.- Inasmuch as no single-cylinder setup of
the'1650-oubic-inch displacement engine'was available, the tests
were conducted on a single-cylinder setup of an in-line liquid-
oooled engine with a l710-cubic-ihch displacement. The compression
ratio of the 1710 cylinder was adjusted to that of the 1650
cylinder; other operating conditions were selected to correspond
as nearky as pcssible~to those of the 1650 engine.
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