The performances of heavy-duty natural gas engines have 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 gasoline and diesel engines. This paper focuses on the impacts of intake manifold water injection on characteristics of combustion and emissions in a natural gas heavy-duty engine through numerical methods. A computational model was setup and validated with experimental data of pressure traces in a CFD software coupled with detailed chemical kinetics. The simulation was mainly carried out in low-speed and full-load conditions, and knock level was also measured and calculated by maximum amplitude of pressure oscillations (MAPO). The results show that the quantity of injected water does not have a negative effect on water spray and film at an appropriate position, but an increase in the quantity of injected water leads to a negative effect on charging efficiency and a decrease in IMEP. However, the knock in natural gas engines can be suppressed after water injected into intake manifold. The simulation results illustrate that, at the same MAPO index, the spark timing can be advanced from 16.3 °CA BTDC to 22.3 °CA BTDC while keeping a relative low level of NOx emissions, and the indicated thermal efficiency increases by 0.6% when the water-to-natural-gas mass ratio is 0.5. Intake manifold water injection technology is also an efficient way to reduce NOx emissions in natural gas engines. Compared with the original emissions, a decrease of 40% in NOx emissions can be achieved under a higher mass ratio of water to natural gas, at 0.6. These indicative results can be helpful for the application of water injection technology in practical heavy-duty natural gas engines to reduce emissions and increase thermal efficiency in the future.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Numerical Study of Intake Manifold Water Injection on Characteristics of Combustion and Emissions in a Heavy-Duty Natural Gas Engine


    Additional title:

    Sae Technical Papers


    Contributors:
    Liang, Heping (author) / Wu, Jingtao (author) / Deng, Jun (author) / Li, Liguang (author) / Shu, Mingyu (author) / Kang, Zhe (author) / Wu, Zhijun (author) / Li, Zhilong (author)

    Conference:

    WCX SAE World Congress Experience ; 2019



    Publication date :

    2019-04-02




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





    Heavy-Duty Engine Intake Manifold Pressure Virtual Sensor

    Cronhjort, Andreas / Apell, Magnus / Stenlaas, Ola et al. | SAE Technical Papers | 2019


    Combustion Characteristics, Performance and NOx Emissions of a Heavy-Duty Ethanol-Diesel Direct Injection Engine

    Giramondi, Nicola / Jäger, Anders / Mahendar, Senthil Krishnan et al. | British Library Conference Proceedings | 2020


    Combustion Characteristics, Performance and NOx Emissions of a Heavy-Duty Ethanol-Diesel Direct Injection Engine

    Erlandsson, Anders / Jäger, Anders / Giramondi, Nicola et al. | SAE Technical Papers | 2020


    Heavy-duty engine emissions

    Online Contents | 1995