Dual Injection HCCI Engine Simulation using a Stochastic Reactor Model
Dual Injection HCCI Engine Simulation using a Stochastic Reactor Model
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使用随机反应器模型进行双喷射 HCCI 发动机仿真
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Jian
中科院分区：
文献类型：
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作者：
S. Mosbach;Haiyun Su;M. Kraft;A. Bhave;F. Mauss;Zhi Wang;Jian
多次直接喷射（MDI）是一种很有前途的策略，能够实现快速响应点火控制以及扩大均质充量压缩点火（HCCI）发动机的操作窗口，从而实现碳烟和NOx排放的大幅降低。在这项工作中，我们扩展了基于概率密度函数的随机反应器模型（SRM）的HCCI发动机，以将MDI和改进的湍流混合模型。为此，一个简单的喷雾模型，具有注射，渗透和蒸发子模型制定，和混合描述的欧几里得最小生成树（埃姆斯特）的子模型占局部组成空间。应用该模型对汽油HCCI发动机进行了模拟计算，单次喷射和双次喷射缸内压力的预测结果与实测值吻合较好。从进行的参数研究表明，与单次喷射相比，额外的第二次喷射有助于延长热释放，从而有助于防止爆震，从而延长高负荷侧的工作范围。跟踪单个随机颗粒的轨迹提供了重要的洞察局部电荷分层的影响，由于直接喷射HCCI燃烧。
Multiple direct injection (MDI) is a promising strategy to enable fast response ignition control as well as expansion of the homogeneous charge compression ignition (HCCI) engine operating window, thus realizing substantial reductions of soot and NOx emissions. In this work, we extend a probability density function based stochastic reactor model (SRM) for HCCI engines in order to incorporate MDI and an improved turbulent mixing model. For this, a simplistic spray model featuring injection, penetration, and evaporation sub-models is formulated, and mixing is described by the Euclidean minimal spanning tree (EMST) sub-model accounting for localness in composition space. The model is applied to simulate a gasoline HCCI engine, and the in-cylinder pressure predictions for single and dual injection cases show a satisfactory agreement with measurements. From the parametric studies carried out it is demonstrated that, as compared to single injection, the additional second injection contributes to prolonged heat release and consequently helps to prevent knock, thereby extending the operating range on the high load side. Tracking the trajectories of individual stochastic particles provides significant insight into the influence of local charge stratification due to direct injection on HCCI combustion.