Numerical study of Intake Manifold Water Injection on Performance and Emissions in a Heavy-duty Nature Gas Engine
The performance of heavy-duty nature gas engines has been limited by combustion temperature and NOx emissions for a long time. Recently, water injection technology has been widely considered as a technical solution in reducing fuel consumption and emissions simultaneously in both diesel and gasoline engines. This paper focuses on the impacts of intake manifold water injection on characteristics of combustion and emissions in a heavy-duty nature gas engine through numerical methods. A detailed numerical model was established and validated with experimental data of pressure traces in CFD software coupled with detailed chemical kinetics. The simulation was mainly carried out under low speed and full load condition, and knock level was also measured and calculated by Logarithmic Knock Intensity (LKI). The results show that intake manifold water injection is an efficient way to reduce high NOX emissions in nature gas engines without deteriorating other emissions characteristics.