. Automotive industries . edesigned by the writer for research purposes, and in whichevery known artifice for obtaining the highest possibleefficiency and power output has been employed. Table I Col. 1E = l —(l/r)«-« Col. 2E = 1 —(1/r) a-** Col. 3E = l —(l/r)« Col. 4Observed ResultsVariable Com-pression Engine The difference between columns 3 and 4 indicates thes
. Automotive industries . edesigned by the writer for research purposes, and in whichevery known artifice for obtaining the highest possibleefficiency and power output has been employed. Table I Col. 1E = l —(l/r)«-« Col. 2E = 1 —(1/r) a-** Col. 3E = l —(l/r)« Col. 4Observed ResultsVariable Com-pression Engine The difference between columns 3 and 4 indicates thescope left for improvement—it is very narrow. So long as-the recognized cycle is adhered to, in its entirety, the im-portance of raising the compression and, therefore, the ex- February 24, 1921 AUTOMOTIVE INDUSTRIESTHE AUTOMOBILE MtfSU- wC\&- * 2^ X ^ctf35El fc* ^rTTl .cCOusi ^ jS^ +i0a2&srs*,vr ^OT* ENGINE ljs£ &J£<tS--frcONV ^^ ^^ Z^C £^ *«$p - COMPRESSION. 457 ISO. 170 160 z o 150° of • a> 140 . •A 7 130°- o bS 120J s z o 8 a si? no S 4 100 Fig. 1—Curves showing efficiencies with varying compres-sion ratio Fig. 2—Curves showing toluene values,compression ratio, efficiencies and ob-served I. M. E. P. pansion is obvious. Now when working with all fuels be-longing to the general group known as gasoline the com-pression pressure which can be employed is limited by thetendency of the fuel to detonate and ultimately to pre-ignite. The explanation of the phenomena of detonationappears to be as follows:—When the mixture is ignitedfrom any one point, the flame at first spreads by the nor-mal process of flame propagation aided by turbulence andin doing so compresses before it the unburnt portion of thecharge; unless the latter can get rid of its heat with suffi-cient rapidity, it is liable to be compressed to a tempera-ture exceeding its self-ignition temperature, with the re-sult that it ignites spontaneously throughout its wholeb
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
