Combustion Characterization of DME-Fueled Dual Fuel Combustion with Premixed Ethanol
2022-01-0562
03/29/2022
- Event
- Content
- The heterogeneous nature of direct injection (DI) combustion yields high combustion efficiencies but harmful emissions through the formation of high nitrogen oxide (NOx) and/or smoke emissions. In response, extensive empirical and computational research has focused on balancing the NOx-smoke trade-off to limit diesel DI combustion emissions. The use of dimethyl ether (DME) fuel in DI compression ignition engines is capable of releasing near-smoke-free emissions. Moreover, the addition of a premixed fuel can minimize DI fuel energy requirements and limit extended injection durations and thus improve overall homogeneity. For this technique, a low reactivity fuel such as Ethanol is essential to avoid the early onset of autoignition. In this work, empirical experiments of dual fuel operation have been conducted using premixed ethanol with direct injected DME. The engine performance was characterized with DI diesel fuel as a baseline, and the matching operation of DME was compared. Furthermore, the application of multi-injection scheduling was studied with a focus on emission formation. The higher volatility of DME realized soot-free combustion with higher combustion efficiency potential. The addition of premixed energy minimized smoke emissions but was limited to the acceptable in-cylinder pressure rise rates. As a result, post-injection was necessary to further increase engine loads which promoted the smoke formation for DI diesel.
- Citation
- Leblanc, S., Yu, X., Sandhu, N., and Zheng, M., "Combustion Characterization of DME-Fueled Dual Fuel Combustion with Premixed Ethanol ," SAE Technical Paper 2022-01-0562, 2022, .