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    • Experimental Study on Combustion and Emissions in an Ammonia-Diesel Dual-Fuel Engine Based on Injection Strategies
    DOI：10.13949/j.cnki.nrjgc.2024.04.002
    Key Words:ammonia-diesel dual-fuel  combustion  injection strategy  dual dieselinjection strategy
    Author NameAffiliationE-mail
    CHEN Qingchu School of Vehicle and Mobility， Tsinghua University， Beijing 100084， China chenqcseven@tsignhua.edu.cn 
    CAI Kaiyuan School of Vehicle and Mobility， Tsinghua University， Beijing 100084， China caiky13@tsinghua.org.cn 
    LIU Yi School of Vehicle and Mobility， Tsinghua University， Beijing 100084， China lyi22@mails.tsinghua.edu.cn 
    QI Yunliang School of Vehicle and Mobility， Tsinghua University， Beijing 100084， China qiyunliang@tsinghua.edu.cn 
    CHEN Hu School of Vehicle and Mobility， Tsinghua University， Beijing 100084， China 13810334450@139.com 
    WANG Zhi* School of Vehicle and Mobility， Tsinghua University， Beijing 100084， China wangzhi@tsinghua.edu.cn 
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    Abstract:A dual-fuel engine using ammonia and diesel was modified， based on a heavy-duty diesel engine experimental platform. A set of electronic control ammonia injection systems was installed， with ammonia injected into the intake manifold and diesel directly injected into the diesel cylinders. By varying the diesel injection strategy， combustion and emission characteristics of the ammonia-diesel dual-fuel engine was optimized under 1 200 r/min medium loads with a 50% ammonia energy ratio. Experimental results show that the slow combustion rate and high ignition temperature of ammonia fuel lead to an asynchronous combustion with diesel in the vicinity of the top dead center of the diesel engine’s original injection strategy， resulting in a “double-peak” heat release curve， leading to lower efficiencies in ammonia combustion. By adopting a dual injection strategy for diesel， the ignition timing of diesel can be delayed by advancing the diesel pilot injection timing， which activates the ammonia fuel outside the piston cavity， promoting synchronization between diesel and ammonia combustion. The “double-peak” heat release curve is transformed into a “single-peak” curve， accelerating the combustion rate， shortening the combustion duration， reducing unburned ammonia emissions， and enhancing ammonia combustion efficiencies. However， excessive advancement of the pilot injection timing may cause diesel wall impingement， which is detrimental to the indicated thermal efficiency.
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