赵廷钰,夏淳,方俊华,等.聚甲氧基二甲醚/汽油双燃料火花辅助压燃燃烧和排放特性研究[J].内燃机工程,2022,43(6):37-47.
聚甲氧基二甲醚/汽油双燃料火花辅助压燃燃烧和排放特性研究
Experimental Study on Combustion and Emission Characteristics of Polyoxymethylene Dimethyl Ethers（PODE）/Gasoline Dual-Fuel Spark Assisted Compression Ignition Engine
DOI：10.13949/j.cnki.nrjgc.2022.06.005
关键词:火花辅助压燃  双燃料发动机  聚甲氧基二甲醚  汽油  燃烧  排放
Key Words:spark assisted compression ignition  dual-fuel engine  polyoxymethylene dimethyl ethers（PODE）  gasoline  combustion  emission
基金项目:国家自然科学基金项目（51861135303）；上海汽车工业科技发展基金项目（1509）
作者单位E-mail
赵廷钰* 上海交通大学 动力机械与工程教育部重点实验室，上海 200240 zty1993@sjtu.edu.cn 
夏淳 上海交通大学 动力机械与工程教育部重点实验室，上海 200240  
方俊华* 上海交通大学 动力机械与工程教育部重点实验室，上海 200240 fjunhua@sjtu.edu.cn 
黄震 上海交通大学 动力机械与工程教育部重点实验室，上海 200240  
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摘要:对一台4缸缸内直喷汽油机的进气歧管和活塞进行改造，搭建了聚甲氧基二甲醚（polyoxymethylene dimethyl ethers， PODE）/汽油双燃料火花辅助压燃（spark assisted compression ignition， SACI）发动机试验平台，以PODE和汽油分别作为直喷和进气道燃料，系统地研究了直喷策略、进气温度和点火正时对双燃料发动机燃烧和排放特性的影响规律。结果表明：在转速为1 600 r/min、负荷为0.4 MPa时，不同直喷正时的试验工况下，双燃料SACI燃烧存在3种不同的燃烧模式。随着直喷正时的提前发动机燃烧趋向于均质压燃，但过于靠前的直喷正时会使得发动机起燃变得困难，不完全燃烧比例增加。在稳定燃烧的前提下发动机在接近均质压燃的燃烧模式下可以获得更高的热效率，同时实现极低的NOx和颗粒物排放。提高进气温度能够显著降低不完全燃烧比例并促进燃料起燃，使得发动机能在更早的直喷正时稳定运行，同时抑制了总碳氢（total hydrogen carbon， THC）和CO排放，但对低温燃烧模式下的NOx排放影响较小。进气温度80 ℃下的最佳热效率相比40 ℃下提高了11.3%，对应的直喷正时提前了30°。提前点火能够促进燃烧的完全进行从而提高热效率，并有效降低THC和CO排放。在较短的喷油—点火间隔下，点火正时的变化能够改变燃烧进程从而实现对燃烧相位的控制。随着直喷正时的提前，点火正时对燃烧的影响减弱。基于合适的进气温度和点火正时，发动机使用汽油/PODE双燃料可以在接近均质压燃的燃烧模式下实现高效清洁的燃烧。
Abstract:A 4-cylinder gasoline direct injection（GDI） engine test bench was modified to work in spark assisted compression ignition combustion mode fueled with polyoxymethylene dimethyl ethers（PODE）and gasoline. The effects of direct injection（DI） strategy， spark timing and intake temperature on the performance of dual-fuel spark assisted compression ignition（SACI） engine were studied. The results show that there are three different SACI combustion modes according to the DI timing on 0.4 MPa at 1 600 r/min. The SACI combustion mode tends to homogeneous charge compression ignition（HCCI） combustion with the advance of DI timing. However， early DI timing will make fuels difficult to ignite and increase the proportion of incomplete combustion. The engine can achieve high thermal efficiency with low nitrogen oxide （NOx） and particle emissions on the HCCI combustion mode under steady combustion. The increasing intake temperature can significantly reduce the proportion of incomplete combustion and promote the autoignition of fuel， which makes the engine be able to run stably at earlier DI timing. The total hydrocarbon （THC） and carbon monoxide（CO） emissions are decreased with increasing intake temperature while the NOx emissions of low temperature combustion mode have a little change. The optimal thermal efficiency at 80 ℃ is 11.3% higher than that at 40 ℃ while the corresponding DI timing is 30° earlier. The advance of spark timing would promote combustion completely， which increases the thermal efficiency with low THC and CO emissions. The spark timing can control the combustion phase by changing the heat release process at the short interval between DI timing and spark timing. The effect of spark timing on combustion characteristics is weakened with advancing DI timing. Based on proper intake temperature and spark timing， the SACI engine fueled with PODE/gasoline can achieve highly efficient and clean combustion under HCCI combustion mode.
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