Effect of Exhaust Gas Recirculation on Combustion Characteristics of Ultra-Low-Sulfur Diesel in Conventional and PPCI Regimes for a High-Compression-Ratio Engine

IF 3 4区工程技术 Q3 ENERGY & FUELS

Energies Pub Date : 2024-08-09 DOI:10.3390/en17163950

C. Srivatsa, S. Alam, Bailey Spickler, Chris Depcik

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Abstract

Low temperature combustion (LTC) mitigates the nitrogen oxide (NOx) and particulate matter (PM) trade-off in conventional compression ignition engines. Significant research on LTC using partially premixed charge compression ignition (PPCI) has typically reduced the compression ratio of the engine to control combustion phasing and lower peak temperatures. This study investigates LTC using PPCI with a high-compression-ratio (=21.2) engine by varying fuel injection timing (FIT) from 12.5° to 30.0° before top dead center (BTDC) while modulating EGR (0%, 7%, 14%, and 25%). Advancing FIT led to a gradual rise in the equivalence ratio of the mixture, in-cylinder pressure, temperature, and rate of heat release due to energy losses associated with ignition occurring before the end of the compression stroke. PPCI was successfully achieved with minimal performance impact using a combination of FIT advancements in the presence of high rates of EGR. Specifically, fuel injected at 25.0° BTDC and 25% EGR reduced PM emissions by 59% and total hydrocarbons by 25% compared with conventional FIT (12.5°) without EGR. Moreover, carbon monoxide and NOx emissions were comparable across set points. As a result, PPCI using high compression ratios is possible and can lead to greater thermal efficiencies while reducing emissions.

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废气再循环对高压缩比发动机超低硫柴油在常规和 PPCI 状态下燃烧特性的影响

低温燃烧（LTC）可以缓解传统压燃发动机中氮氧化物（NOx）和颗粒物（PM）的权衡问题。有关使用部分预混合充气压燃（PPCI）进行低温燃烧的重要研究通常会降低发动机的压缩比，以控制燃烧相位和降低峰值温度。本研究调查了使用 PPCI 的高压缩比（=21.2）发动机的 LTC，方法是将燃油喷射正时（FIT）从顶死中心（BTDC）前 12.5° 变为 30.0°，同时调节 EGR（0%、7%、14% 和 25%）。推进 FIT 会导致混合气等效比、气缸内压力、温度和热量释放率逐渐上升，这是因为在压缩冲程结束前点火会造成能量损失。在高 EGR 率的情况下，通过结合使用先进的 FIT 技术，成功实现了 PPCI，并将其对性能的影响降至最低。具体地说，与不使用 EGR 的传统 FIT（12.5°）相比，在 25.0° BTDC 和 25% EGR 下喷射的燃料可使 PM 排放减少 59%，碳氢化合物总量减少 25%。此外，各设定点的一氧化碳和氮氧化物排放量相当。因此，使用高压缩比的 PPCI 是可行的，可以在降低排放的同时提高热效率。

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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来源期刊

Energies ENERGY & FUELS-

CiteScore

6.20

自引率

21.90%

发文量

8045

审稿时长

1.9 months

期刊介绍： Energies (ISSN 1996-1073) is an open access journal of related scientific research, technology development and policy and management studies. It publishes reviews, regular research papers, and communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.