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On the importance of specific heats as regards efficiency increases for highly dilute IC engines

机译:关于比热的重要性,有关高度稀释的IC发动机的效率提高

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Engineering and scientific efforts continue with the development of advanced, IC engines using highly dilute mixtures, and relatively high compression ratios. Such engines are known to provide opportunities for low emissions as well as high efficiencies. The main features of these engines include higher compression ratios, lean operation, use of EGR, and shorter burn durations. First, this study reviews the quantitative contributions of each of these features as determined by an engine cycle simulation. Second, this study provides the quantitative contributions to the increased efficiency in terms of fundamental ther-modynamic considerations. An automotive engine operated at 2000 rpm was selected for this study. For the conditions examined, the net indicated thermal efficiency increased from 37.0% (conventional engine) to 53.9% (high efficiency engine) - for an incremental increase of 16.9% (absolute). The contribution of increases of the ratio of specific heats towards the final thermal efficiency is quantified. This aspect has been well known, but has not been quantified for actual engines. For the various conditions examined, 21-35% of the total efficiency improvement was estimated to be due to the increase of the ratio of specific heats.
机译:随着采用高度稀薄混合物和相对高压缩比的先进IC发动机的开发,工程和科学方面的努力继续进行。已知这样的发动机提供了低排放以及高效率的机会。这些发动机的主要特点包括更高的压缩比,稀薄运行,使用EGR和缩短燃烧持续时间。首先,这项研究回顾了由发动机循环仿真确定的每个特征的定量贡献。其次,本研究从基本热力学考虑的角度为提高效率提供了定量的贡献。本研究选择了以2000 rpm运行的汽车发动机。对于所检查的条件,净指示热效率从37.0%(常规发动机)增加到53.9%(高效发动机)-增量增加16.9%(绝对值)。定量比热增加对最终热效率的贡献。这方面是众所周知的,但尚未针对实际发动机进行量化。对于所检查的各种条件,估计总效率提高的21-35%是由于比热比的增加。

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