An experimental study on combustion and emissions characteristics in a dual-injection spark-assisted compression ignition engine fueled with PODE/gasoline

IF 1.1 4区工程技术 Q4 THERMODYNAMICS Thermal Science Pub Date : 2023-01-01 DOI:10.2298/tsci220109058z

Tingyu Zhao, Chun Xia, Junhua Fang, Lei Zhu, Zhen Huang

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Abstract

Spark-assisted compression ignition (SACI) is a potential way to improve thermal efficiency for gasoline engine with a relatively low compression ratio. The dual-injection system and spark strategy are considered to be an effective approach to control the combustion of SACI engine. Polyoxymethylene dimethyl ethers (PODE) is a potential fuel for carbon neutral with high oxygen content and unique molecule structure. In this study, the transition of combustion modes with different equivalence ratio and effects of direct injection (DI) ratio on SACI combustion and emissions fueled with PODE/gasoline under different loads were investigated. The results showed that SACI combustion could be achieved with the compression ratio of 13 and the brake thermal efficiencies (BTEs) at 2 bar, 3 bar and 4 bar under the dual-fuel SACI were increased by 49%, 29% and 27%, respectively, compared with the gasoline spark ignition mode. The increase in DI ratio first shortened the combustion duration and then prolonged. An appropriate DI ratio was shown to control the combustion process to achieve high efficiency combustion, at which Low THC, CO and PM emissions were achieved while the NOx emissions remained at a low level.

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以PODE/汽油为燃料的双喷射火花辅助压缩点火发动机燃烧与排放特性试验研究

对于压缩比较低的汽油机来说，火花辅助压缩点火(SACI)是一种很有潜力的提高热效率的方法。双喷射系统和火花策略被认为是控制SACI发动机燃烧的有效方法。聚氧二甲基醚(PODE)具有高氧含量和独特的分子结构，是一种潜在的碳中性燃料。本文研究了不同当量比下燃烧模式的转换，以及不同负荷下直喷比对SACI燃烧和PODE/汽油排放的影响。结果表明，在压缩比为13的情况下，双燃料SACI可实现燃烧，在2、3、4 bar工况下的制动热效率(BTEs)分别比汽油火花点火模式提高49%、29%和27%。直喷比的增加先缩短燃烧时间，后延长燃烧时间。研究表明，适当的DI比可以控制燃烧过程，实现高效燃烧，在低THC、CO和PM排放的同时，NOx排放保持在较低水平。

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来源期刊

Thermal Science 工程技术-热力学

CiteScore

2.70

自引率

29.40%

发文量

399

审稿时长

5 months

期刊介绍： The main aims of Thermal Science to publish papers giving results of the fundamental and applied research in different, but closely connected fields: fluid mechanics (mainly turbulent flows), heat transfer, mass transfer, combustion and chemical processes in single, and specifically in multi-phase and multi-component flows in high-temperature chemically reacting flows processes present in thermal engineering, energy generating or consuming equipment, process and chemical engineering equipment and devices, ecological engineering, The important characteristic of the journal is the orientation to the fundamental results of the investigations of different physical and chemical processes, always jointly present in real conditions, and their mutual influence. To publish papers written by experts from different fields: mechanical engineering, chemical engineering, fluid dynamics, thermodynamics and related fields. To inform international scientific community about the recent, and most prominent fundamental results achieved in the South-East European region, and particularly in Serbia, and - vice versa - to inform the scientific community from South-East European Region about recent fundamental and applied scientific achievements in developed countries, serving as a basis for technology development. To achieve international standards of the published papers, by the engagement of experts from different countries in the International Advisory board.