Evaluation of an Optimal Engine Configuration for a SI Engine Fueled with Ethanol for Stationary Applications

D. Perrone, L. Falbo, Biagio Falbo, T. Castiglione
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Abstract

This work aims at investigating the optimal configuration of an internal combustion engine fueled with bio-ethanol for improving its brake power and efficiency as well as for reducing the NOx emissions, in stationary applications. A turbocharged spark ignition engine characterized by a single-point injection was preliminarily considered; subsequently, a direct injection configuration was investigated. For both cases, a 1-D numerical model was developed to compare the injection configurations under stoichiometric conditions and different spark timings. The analysis shows that the direct injection guarantees: a limited improvement of brake power and efficiency when the same spark timing is adopted, while NOx emissions increases by 20%; an increase of 6% in brake power and 2 percentage points in brake thermal efficiency by adopting the knock limited spark advance, but an almost double NOx emissions increase. In order to exploit the advantages of the direct injection, an engine configuration characterized by higher compression ratio, lower boost pressure and different cam phasing was proposed. By adopting a spark timing of 23°CA BTDC and a lean mixture (ϕ = 0.8), the engine provides a brake power of 232 kW, a brake thermal efficiency of 42%, which are 4% and 14 percentage points higher than single point configuration, respectively, and NOx emissions, amounting to 3 g/kWh, 9% lower with respect to single point injection.
评估固定应用中以乙醇为燃料的 SI 发动机的最佳发动机配置
这项工作旨在研究以生物乙醇为燃料的内燃机的最佳配置,以提高其制动功率和效率,并减少固定应用中的氮氧化物排放。首先考虑的是以单点喷射为特征的涡轮增压火花点火发动机,随后研究了直接喷射配置。针对这两种情况,开发了一个 1-D 数值模型,以比较在化学计量条件和不同火花定时下的喷射配置。分析表明,直接喷射可保证:采用相同的火花时机时,制动功率和效率得到有限提高,而氮氧化物排放量增加 20%;采用敲击限制火花提前量时,制动功率提高 6%,制动热效率提高 2 个百分点,但氮氧化物排放量几乎增加一倍。为了发挥直喷技术的优势,我们提出了一种以更高压缩比、更低增压压力和不同凸轮相位为特征的发动机配置。通过采用 23°CA BTDC 的火花正时和稀混合气(j = 0.8),该发动机的制动功率为 232 千瓦,制动热效率为 42%,分别比单点配置高出 4% 和 14 个百分点,氮氧化物排放量为 3 克/千瓦时,比单点喷射低 9%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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