NGHIÊN CỨU ẢNH HƯỞNG CỦA LUÂN HỒI KHÍ THẢI VÀ TĂNG ÁP ĐẾN ĐẶC TÍNH CHÁY VÀ KHÍ THẢI CỦA ĐỘNG CƠ CHÁY BẰNG NÉN VỚI NHIÊN LIỆU XĂNG (GCI - GASOLINE COMPRESSION IGNITION)
Abstract
Gasoline-ethanol blend used as fuel for gasoline compression ignition (GCI) engines, considering the higher resistance to auto-ignition, better vaporization ability, and higher oxygen content in ethanol, all have the potential to further improve the already high efficiency of compression ignition (CI) diesel engines compared to gasoline engines. Biofuels also simultaneously meet the sustainable development trend, especially in the energy sector, and reduce harmful emissions, particularly particulate matter (PM) and nitrogen oxides (NOx).
This article presents a study on the influence of exhaust gas recirculation and intake air boosting on the combustion characteristics and emissions of partially premixed compression ignition engines. The experiments in this study were conducted on a single-cylinder compression ignition engine with a focus on dual-fuel injection strategy, with the first injection occurring at -35 degrees after top dead center and the second injection occurring later, near top dead center. The engine operating conditions were kept constant: engine speed of 1500 rpm, intake air temperature of 165°C, intake pressure of 1 bar, and injection pressure of 400 bar. The main parameters investigated were the combustion control measures for compression ignition engines, with two parameters studied to optimize the dual-fuel injection strategy, aiming to increase combustion efficiency and minimize harmful emissions such as PM and NOx.
The experimental results showed that controlling the exhaust gas recirculation rate, intake air boosting level, and fuel injection strategy appropriately can reduce the emissions of engines using the compression ignition combustion model.
