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    • Research on Combustion and Soot Emission Characteristics of A Dual Direct Injection Engine Based on the Combined Control of Nozzle Arrangements and Injection Parameters
    DOI：10.13949/j.cnki.nrjgc.2023.02.003
    Key Words:high pressure direct injection  natural gas engine  jet angle  injection duration  soot emission
    Author NameAffiliationE-mail
    CHEN Miaoyu* Yunnan Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China cmiaoyu98@163.com 
    GONG Hang* Engineering Training Centre， Kunming University of Science and Technology， Kunming 650500， China 834319423@qq.com 
    HUANG Fenlian Yunnan Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China  
    YANG Jie College of Civil Aviation and Aviation， Kunming University of Science and Technology， Kunming 650500， China  
    CHEN Guisheng Yunnan Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China  
    WEI Feng Yunnan Key Laboratory of Internal Combustion Engines， Kunming University of Science and Technology， Kunming 650500， China 893549826@qq.com 
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    Abstract:The analysis of combustion process and soot formation and oxidation processes of a pilot diesel ignited high pressure direct injection engine with the combined effects of the angle α between the central axis of the natural gas jet and the horizontal direction， and natural gas injection duration（NID）， were performed by establishing a three-dimensional computational fluid dynamic（CFD） diesel/natural gas dual direct injection model coupled with a simplified chemical kinetic mechanism of multi-component mixture and a phenomenological soot model. The results show that shortening the NID can increase the diffusion flame propagation speed and the chemical reaction rate in the combustion area. Meanwhile， the burst pressure， peak value of heat release rate， maximum pressure rise rate（MPRR）， indicated thermal efficiency（ITE） increase with the increasing of NID. As NID shortens， the reaction rates of A4 and C2H2 consumption increase， the peak value of OH increases， soot production decreases and oxidation effect is enhanced. Increasing α promotes the formation of large-scale vortex structure， reduces the proportion of fuel entering the squish region， and facilitates the improvement of ITE. At a shorter NID， the burst pressure and peak value of heat release rate increase significantly with the increase of α. The peak values of A4 and C2H2 can be significantly reduced， soot nucleation and surface growth reactions can be inhibited， and soot production can be reduced when α is increased to 20°. Considering the combined effects of the burst pressure， MPRR， ITE and soot emissions， the optimized cases are α=15° & NID=16.5° and α=20° & NID=21.5°.
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