Effects of combustion products composition models on the exergetic analysis of spark-ignition engine fuelled with ethanol

IF 1.2 Q4 THERMODYNAMICS Archives of Thermodynamics Pub Date : 2023-07-20 DOI:10.24425/ather.2019.129548

Caio H. Rufino, A. J. T. B. D. Lima, A. P. Mattos, F. U. Allah, Janito V. Ferreir, R. WALDYRL.

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引用次数: 1

Abstract

The engine simulations have become an integral part of engine design and development. They are based on approximations and assumptions. The precision of the results depends on the accuracy of these hypotheses. The simpliﬁed models of frozen composition, chemical equilibrium and chemical kinetics provide the compositions of combustion products for engine cycle simulations. This paper evaluates the eﬀects of diﬀerent operating conditions and hypotheses on the exergetic analysis of a spark-ignition engine. The Brazilian automotive market has the highest number of ﬂex-fuel vehicles. Therefore, a ﬂex-fuel engine is considered for simulations in order to demonstrate the eﬀects of these diﬀerent hypotheses. The stroke length and bore diameter have the same value of 80 mm. The in-cylinder irreversibility is calculated for each case at the closed part of the engine cycle. A comparative analysis of these hypotheses provides a comprehensive eval-uation of their eﬀects on exergetic analysis. Higher values of accumulated irreversibility are observed for the oversimpliﬁed hypothesis.

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燃烧产物组成模型对以乙醇为燃料的火花点火发动机火用分析的影响

发动机仿真已经成为发动机设计和开发的一个组成部分。它们基于近似和假设。结果的准确性取决于这些假设的准确性。冷冻成分、化学平衡和化学动力学的简化模型为发动机循环模拟提供了燃烧产物的成分。本文评估了不同操作条件和假设对火花点火式发动机性能分析的影响。巴西汽车市场的燃油汽车数量最多。因此，考虑使用燃油发动机进行模拟，以证明这些不同假设的效果。冲程长度和孔径的值相同，为80 mm。在发动机循环的闭合部分，计算每种情况下的缸内不可逆性。对这些假设进行比较分析，可以全面评估它们对运动分析的影响。对于过于简单的假设，观察到更高的累积不可逆性值。

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来源期刊

Archives of Thermodynamics THERMODYNAMICS-

CiteScore

1.80

自引率

22.20%

发文量

期刊介绍： The aim of the Archives of Thermodynamics is to disseminate knowledge between scientists and engineers interested in thermodynamics and heat transfer and to provide a forum for original research conducted in Central and Eastern Europe, as well as all over the world. The journal encompass all aspect of the field, ranging from classical thermodynamics, through conduction heat transfer to thermodynamic aspects of multiphase flow. Both theoretical and applied contributions are welcome. Only original papers written in English are consider for publication.