Since several features change as the cases move from 1 to 5, it is
difficult to isolate the effect of the increasing ratio of specific heats
on thermal efficiency. As an alternative, the simple Otto cycle can
be examined. Since the simple Otto cycle is an adiabatic cycle, the
effects of the ratio of specific heats on efficiency are more direct.
For example, an increase of this ratio from 1.30 to 1.31 for a compression
ratio of eight results in about a 1% absolute increase of the
thermal efficiency (say, from 46.4% to 47.5%). If this improvement
is indicative of actual cycles, then the increase of the ratio of specific
heats shown in Fig. 9 may be responsible for about one half
of the e
Since several features change as the cases move from 1 to 5, it isdifficult to isolate the effect of the increasing ratio of specific heatson thermal efficiency. As an alternative, the simple Otto cycle canbe examined. Since the simple Otto cycle is an adiabatic cycle, theeffects of the ratio of specific heats on efficiency are more direct.For example, an increase of this ratio from 1.30 to 1.31 for a compressionratio of eight results in about a 1% absolute increase of thethermal efficiency (say, from 46.4% to 47.5%). If this improvementis indicative of actual cycles, then the increase of the ratio of specificheats shown in Fig. 9 may be responsible for about one halfof the e
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