刘芮含,朱继贞,钱勇,等.柴油双直喷策略在高负荷工况下的燃烧与排放特性[J].内燃机工程,2025,46(4):64-72.
柴油双直喷策略在高负荷工况下的燃烧与排放特性
Combustion and Emission Characteristics of Diesel Dual Direct Injection Strategy Under High Load Conditions
DOI：10.13949/j.cnki.nrjgc.2025.04.008
关键词:柴油机  双直喷策略  高负荷工况  燃烧过程  排放特性
Key Words:diesel engine  dual direct injection strategy  high-load condition  combustion process  emission characteristic
基金项目:
作者单位E-mail
刘芮含* 上海交通大学 中英国际低碳学院，上海 201306
上海交通大学 动力机械与工程教育部重点实验室，上海 200240 		tao.tao@sjtu.edu.cn 
朱继贞* 上海交通大学 动力机械与工程教育部重点实验室，上海 200240 jizhen.zhu@sjtu.edu.cn 
钱勇 上海交通大学 动力机械与工程教育部重点实验室，上海 200240 qiany@sjtu.edu.cn 
吕兴才 上海交通大学 动力机械与工程教育部重点实验室，上海 200240 lyuxc@sjtu.edu.cn 
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摘要:针对柴油机高负荷工况下单喷油器模式喷油持续期长、燃油雾化质量差而引起的热效率低和污染物排放高等问题，提出了柴油双直喷策略。通过试验对比研究了单、双喷油器模式在高负荷工况下的燃烧排放特性，并结合计算流体力学模拟方法对缸内燃烧与排放过程进行详细解析。结果表明：双喷油器模式呈现三阶段放热特征，其中第一阶段为副喷油器喷射引起的低温放热，而第二阶段为副喷油器喷射引起的高温放热，第三阶段则为主喷油器喷射引起的高温放热；此外，双直喷策略下的着火时刻更加提前，燃烧重心更靠近上止点，因此具有较高的热效率。
Abstract:To solve the issues of low thermal efficiency and high emissions caused by long injection duration and poor atomization quality of single injector mode under high-load condition of diesel engine， the diesel dual direct injection strategy was proposed. The combustion and emission characteristics of single and double injector modes under high-load conditions were studied by experiments， and further analyzed in detail by computation fluid dynamics （CFD） simulation method. The results show that the dual direct injector mode presents three stages of heat release. The first stage is the low temperature heat release of the auxiliary injector， the second stage starts from the high temperature heat release of the auxiliary injector， and the third stage is the high temperature heat release caused by the main injector. In addition， the ignition timing under the dual direct injection strategy is advanced， and the center of combustion is closer to the top dead center， thereby leading to the higher thermal efficiency.
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