Numerical Investigation on the Influence of Injection Location and Injection Strategy on a High-Pressure Direct Injection Diesel/Methanol Dual-Fuel Engine

High-pressure direct injection diesel/methanol dual-fuel engines exhibit excellent emission reduction potential, but they are still in the initial stage of research and development. The influences different methanol locations, duration, pressures on combustion characteristics, mixture homogeneity, exhaust emissions investigated to explore appropriate strategies further optimize engine performance base using CONVERGE software. results show that impact position is relatively small, especially characteristics. A larger axial nozzle distance contributes formation homogeneous mixture, improving economy. However, remarkably affected by duration pressure. shorter achieved with a decrease an increase pressure, as result which fuel economy improved, process more concentrated near top dead center. Simultaneously, homogeneity enhanced, conducive soot CO emissions, yet not NOX HC reduction. lowest overall NOX, soot, CO, when radial 2.5 mm 0.5 mm, respectively. Besides, characteristics significantly under locations pressures. increased interval leads deteriorating economy, i.e., delayed phase (CA50), extended ignition delay (CA10–CA90), thereby increasing decreasing emission. Additionally, optimal obtained adopting 6 °CA pressure 44.4 MPa. ITE this case compared other strategies, significantly. provide parametric feedback theoretical support for design high-pressure from time space perspective, has certain significance.