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    • Effects of Piston Bowl Geometry and Injection Strategy on Natural Gas-Diesel Reactivity Controlled Compression Ignition Engine
    DOI：10.13949/j.cnki.nrjgc.2022.01.005
    Key Words:reactivity controlled compression ignition（RCCI）  spray angle  natural gas  squeeze height  throat radius
    Author NameAffiliationE-mail
    CHEN Weize* School of Energy and Power Engineering， Wuhan University of Technology， Wuhan 430063， China 1124776524@qq.com 
    ZHANG Zunhua School of Energy and Power Engineering， Wuhan University of Technology， Wuhan 430063， China  
    LONG Yanxiang School of Energy and Power Engineering， Wuhan University of Technology， Wuhan 430063， China  
    SHAO Chaofan School of Energy and Power Engineering， Wuhan University of Technology， Wuhan 430063， China  
    LI Gesheng* School of Energy and Power Engineering， Wuhan University of Technology， Wuhan 430063， China gsli@whut.edu.cn 
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    Abstract:To optimize the piston bowl geometry and diesel injection strategy of reactivity controlled compression ignition（RCCI） engines， effects of the squeeze height， throat radius and spray angle on the ignition， combustion and emission characteristics of natural gas-diesel RCCI engine under 75% load condition were numerically studied by CONVERGE. Results show that the increase of the squeeze height promotes the atomization of diesel， contributing to the adequate combustion of fuels. The oversizing squeeze height weakens the reactive stratification， lowers the combustion temperature and increases soot emission. For the studied engine model， the optimal squeeze height is 6.56 mm. Increasing throat radius prolongs the diesel spray process， reduces NOx emission and increases soot emission. When the throat radius is oversized， the peaks of the in-cylinder pressure and NOx emission are increased. For the studied engine model， the optimal throat radius is 73.29 mm. As the spray angle increases， the distribution region of fuel moves up from the pit region to the squeeze region， resulting in the decrease of the in-cylinder pressure and NOx emission， and the increase of soot emission.
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