naca-tn-838
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National Advisory Committee for Aeronautics, Technical Notes - The Tracer Gas Method of Determining the Charging Efficiency of Two Stroke Cycle Diesel Engines
A convenient method has been developed for determiner
ing the scavenging efficiency or the charging efficiency
of two—strokeucycle engines. The method consiste'ofmintro— , ’H
ducing a suitable tracer gas into the inlet air of the " ' '""
running engine and measuring chemically its concentration
both in the inlet andexhaust gas. Hononethylamine Ufigfihghg
was found suitable for the purpose as it burns almost con—
pletely during- combustion, whereas the "short—circuited '
tatively in the exhaust. The method-was'testedmb_eth_ on_:_
fournstroke and on .two—strok.e engines and is considered
accurate within 1 percent.
The development of two—stroke—cycle engines usually
centers around the problem of obtaining geod_ scavenging
ciency" is, however, rather elusive. No generally accept-
ed definition exists and attempts to measure the success '
of scavenging experimentally have been unsatisfactbrv_.
The object of this paper is first to establish a censist~_
ent_ terminology and then to describe a simple experimentaI
method to measure and evaluate the su ccé.ss of scavenging
and charging a two— stroke—cvcle engine.
T.his -work was done in the Engineering Experiment _Sta~
tion of The Pennsylvania State College under the direc.—
tion o'f Professor F. G. Hechler who followed the progre_ss 1
of and assisted in the work
The primary phase of the preliminary investigation
was done by Dr. Kuo Ping, research assistant. Mr. W. E.
Hough and Mr. I. Zipkin, senior and graduate students, p'
helped in the chemical phase of the work. Valuable advice
was given by Dr. C. C. Wright, associate professor of
Fuel Technology and Dr. J. D. Aston, professor of organic
chemistry, The PennsyIVania State College. Their assist—
ance is gratefully-acknowledged.
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