Dual injection homogeneous charge compression ignition engine simulation using a stochastic reactor model
Dual injection homogeneous charge compression ignition engine simulation using a stochastic reactor model
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使用随机反应堆模型进行双喷射均质压燃式发动机仿真
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
J. X. Wang
中科院分区：
文献类型：
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作者：
S. Mosbach;Haiyun Su;Markus Kraft;A. Bhave;F. Mauss;Z;J. X. Wang
摘要多次直接喷射（MDI）是一种很有前途的策略，可以实现快速响应的点火控制以及扩大均质充量压缩点火（HCCI）发动机的工作窗口，从而实现大幅降低碳烟和NOx排放。本文扩展了基于零维概率密度函数的HCCI发动机随机反应器模型（SRM），以纳入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相空间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。
Abstract 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. The present paper extends a zero-dimensional-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 with 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 phase space trajectories of individual stochastic particles provides significant insight into the influence of local charge stratification owing to direct injection on HCCI combustion.