闫鑫,朱天奎,仇钰啸,等.聚甲氧基二甲醚和汽油双燃料火花辅助压燃燃烧及排放试验研究[J].内燃机工程,2024,45(3):11-20.
聚甲氧基二甲醚和汽油双燃料火花辅助压燃燃烧及排放试验研究
Experimental Study on Combustion and Emissions of Spark-Assisted Compression Ignition of Polyxymethylene Dimethyl Ether/Gasoline Dual-Fuel
DOI：10.13949/j.cnki.nrjgc.2024.03.002
关键词:双燃料  火花辅助压燃  高压缩比  直喷策略  点火策略
Key Words:dual fuel  spark-assisted compression ignition（SACI）  highcompression ratio  direct injection strategy  ignition strategy
基金项目:
作者单位E-mail
闫鑫 上海交通大学 智慧能源创新学院，上海200240 318749170@sjtu.edu.cn 
朱天奎 上海交通大学 动力机械与工程教育部重点实验室，上海200240 zhutiankui@sjtu.edu.cn 
仇钰啸 上海交通大学 动力机械与工程教育部重点实验室，上海200240 qiu_yx@sjtu.edu.cn 
管斌* 上海交通大学 动力机械与工程教育部重点实验室，上海200240 guanbin@sjtu.edu.cn 
黄震 上海交通大学 智慧能源创新学院，上海200240
上海交通大学 动力机械与工程教育部重点实验室，上海200240 		z-huang@sjtu.edu.cn 
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摘要:试验平台基于汽油缸内直喷（gasoline direct injection， GDI）发动机改造，缸内直喷聚甲氧基二甲醚（polyoxymethylene dimethyl ether， PODE），进气道喷射汽油，并将压缩比从10提升至15以利于压燃，以点火和直喷策略作为控制参数，获取双燃料火花辅助压燃（dual-fuel spark-assisted compression ignition， DF-SACI）发动机的运行特征。试验结果表明：DF-SACI呈现多阶段放热，直喷正时提前可提高混合气均匀性，减小不同燃烧阶段的界限，放热率明显提高；直喷比例可以更为有效地调节CA50和等容燃烧的比例，对热效率影响明显；同时放热率受点火正时提前的影响最小。试验中有效热效率最高可达37.5%。排放方面，DF-SACI模式在合适的点火和喷射策略下，可在一定程度上降低HC和CO的排放，HC体积分数可降低至3 00010-6以下，CO体积分数可降低至1 50010-6以下，同时将NOx排放控制在较低水平。通过对燃烧策略的合理调整，PODE/汽油双燃料发动机借助火花辅助压燃可实现高效清洁燃烧。
Abstract:The test platform was based on a modified gasoline direct injection（GDI） engine， with direct injection of polyoxymethylene dimethyl ether （PODE） in the engine cylinder， injection of gasoline in the intake tract， and an increase of the compression ratio from 10 to 15. The ignition and direct injection strategies were used as control parameters to get operating characteristics of the dual-fuel spark-assisted compression ignition （DF-SACI） engine. The test results show that the in-cylinder combustion shows multi-stage heat release， and advancing direct injection timing can improve the uniformity of the mixture， reduce the boundaries of different combustion stages and significantly increase the heat release rate（HRR）. The direct injection ratio can more effectively regulate the ratio of CA50 and iso-capacitive combustion， which has a significant impact on the thermal efficiency. The HRR is minimally affected by advancing the ignition timing. The maximum brake thermal efficiency in the test was 37.5%. In terms of emissions， the DF-SACI mode can reduce HC and CO emissions to a certain extent under the appropriate ignition and injection strategies， with the concentrations of HC reduced to below 3 000 ×10-6 and CO reduced to below 1 500×10-6， and keep NOx concentrations at a low level. Through the reasonable adjustment of the combustion strategies， the PODE/gasoline dual-fuel engine can realize efficient and clean combustion with the help of SACI.
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