首页|燃烧室结构对中负荷反应活性控制压燃发动机影响的模拟研究

燃烧室结构对中负荷反应活性控制压燃发动机影响的模拟研究

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通过机理耦合和自动优化构建了包含重质柴油成分的多组分汽油/柴油替代物反应机理.将机理与CONVERGE耦合,构建了包含原机omega型燃烧室系统(omega combustion system,OMECS)、分离式涡流燃烧室系统(separated swirl combustion system,SSCS)和横向涡流燃烧室系统(lateral swirl combustion system,LSCS)的三维计算模型,以研究不同燃烧室对中负荷大预混比例条件下反应活性控制压燃(reactivity controlled compression ignition,RCCI)发动机的影响.结果表明,与OMECS燃烧室相比,SSCS和 LSCS燃烧室的指示热效率分别提高了 4.65%和 3.51%,除 NOx外,其他排放物均有所降低.能量平衡分析和传热分析显示,传热损失、燃烧损失和排气损失降低;这表明新型燃烧室对 RCCI燃烧模式的优化机制与对纯柴油燃烧模式不同.活塞壁面对柴油喷雾的引导效应不明显,但新型燃烧室独特的结构和缸内气流运动(例如 SSCS 燃烧室的分离燃烧室和 LSCS 燃烧室凸边两侧的小尺寸涡流等)对传热的削弱效应大于面容比和缸内温度增加对传热的增强效应.在所有的第二次喷射正时(start of injection,SOI)下,新型燃烧室的指示热效率均高于原机.
Simulation Study on the Effects of Combustion Chamber Structures on Reactivity Controlled Compression Ignition Engines Under Medium Loads
A multi-component gasoline/diesel surrogate mechanism which includes heavy diesel components was constructed through mechanism coupling and automatic optimization.The mechanism was then coupled with CONVERGE to create three-dimensional computational models,including the omega combustion system(OMECS),separated swirl combustion system(SSCS)and lateral swirl combustion system(LSCS).The study focused on examining the impacts of different combustion chambers on the reactivity controlled compression ignition(RCCI)engine under medium load and high premix ratio conditions.The results show that compared to the OMECS combustion chamber,the SSCS and LSCS combustion chambers exhibit an increase in the indicated thermal efficiencies of 4.65%and 3.51%,respectively,while other emissions,except for NOx,are reduced.Energy balance and heat transfer analysis revealed a decrease in heat transfer loss,combustion loss and exhaust loss.The optimization mechanism for the new combustion chamber in RCCI combustion mode differs from that of pure diesel combustion.The influence of wall spray interaction is not significant,while the unique structure and organization of the cylinder airflow(such as the separation combustion chamber of the SSCS combustion chamber and the small size vortex on both sides of the convex edge of the LSCS combustion chamber)weaken the heat transfer more than the enhancement of the surface volume ratio and the increase of the cylinder temperature on the heat transfer.Overall,the SSCS and LSCS combustion chambers consistently demonstrate higher indicated thermal efficiencies compared to the original chamber under all second starts of injection(SOI).

reaction mechanismseparated swirl combustion system(SSCS)lateral swirl combustion system(LSCS)energy balance analysisheat transfer analysis

郎茂春、苏岩、王耀东、沈博、张玉林、钱丁超

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吉林大学 汽车仿真与控制国家重点实验室,长春 130022

汽车振动噪声与安全控制综合技术国家重点实验室,长春 130000

反应机理 分离式涡流燃烧室系统 横向涡流燃烧室系统 能量平衡分析 传热分析

国家自然科学基金区域创新发展联合基金项目国家能源石油炼制技术研发中心开放基金项目

U21A2016633600000-22-ZC0607-0003

2024

10.13949/j.cnki.nrjgc.2024.01.003

内燃机工程
中国内燃机学会

内燃机工程

CSTPCD北大核心
影响因子：0.601
ISSN：1000-0925
年,卷(期)：2024.45(1)
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