Experimental Studies of the Knock-Limited Blending Characteristics of Aviation Fuels II : Investigation of Leaded Paraffinic Fuels in an Air-Cooled Cylinder Page: 4 of 31
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'NACA TN No. 1374
reciprocal blending relation derived in reference 1 is applicable
to blends of paraffinic fuels at rich mixtures. On the other hand,
the relation was not applicable to lean-mixture data for paraf-
f inic fuels and is probable that the disagreement may have
resulted from improper control of cylinder temperatures adjacent
to the knocking zone.
The primary purpose of the investigation reported is to
study the blending characteristics of a number of leaded paraf-
f inic aviation-fuel components in a full-scale air-cooled engine
cylinder. A secondary purpose is to compare the following cor-
(a) The knock-limited performance of a full-scale engine at
lean-mixture operation plotted against the knock-limited perform-
ance of the engine at rich-mixture operation for a series of
(b) The knock-limited. performance of a full-scale engine at
rich-mixture operation plotted against the knock-limited perform-
ance at rich-mixture operation of a small-scale engine for a
series of fuels
In each case the following methods of specifying the knock-limited
performance of the engine were investigated:
(1) Knock-limited indicated mean effective pressure
(2) Percentage of S-4 plus 4 ml TEL per gallon in M-4 plus
4 ml TEL per gallon to give an equal knock-limited indicated mean
(3) Ratio of indicated mean effective pressure of test fuel
to indicated mean effective pressure of clear S-4 reference fuel,
all other conditions being the same
Runs were made on a full-scale air-cooled cylinder; F-4 rat-
ings were determined for most of the blends.
The base fuels used in this investigation were alkylate and
virgin base. The blending components were:
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Wear, Jerrold D. & Sanders, Newell D. Experimental Studies of the Knock-Limited Blending Characteristics of Aviation Fuels II : Investigation of Leaded Paraffinic Fuels in an Air-Cooled Cylinder, report, July 1, 1947; (digital.library.unt.edu/ark:/67531/metadc55425/m1/4/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.