引燃柴油在甲烷-空气混合气中的着火模型  

Autoignition Model of Pilot Diesel in the Mixture of Methane with Air

作　　者：宋金瓯[1] 姚春德[1] 姚广涛[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室

出　　处：《燃烧科学与技术》2005年第1期10-13,共4页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(50076031);天津大学青年教师基金资助项目(W50101).

摘　　要：分析双燃料发动机引燃柴油在甲烷 空气混合气中的着火过程,提出一种新的着火模型.着火模型的基本框架仍然采用Shell模型,但考虑了CH4 对柴油着火过程的影响.柴油的着火过程是退化分支链的反应过程,根据CH4 基元反应的特点,分析CH4 对柴油退化分支链反应机理的影响,提出一种修正的Shell模型,并进行了试验分析.模拟计算选用KIVA 3程序,修正的Shell模型作为KIVA 3的一个独立的着火子程序.试验结果表明,修正的Shell模型能够较好地模拟引燃柴油在甲烷 空气混合气中的着火过程.This paper presents a new model describing the autoignition of pilot diesel in the mixture of methane with air for dual fuel engines. The skeleton of the new autoignition model is based on Shell model, which considers the effect of methane on autoignition of diesel. The characteristic of elementary reactions of methane is discussed and its effects on degenerate chain branching reactions of diesel are analyzed, and thus a simplified modification to Shell model is made. The modified Shell model has been integrated with the KIVA software as a freestanding code and validated by experiments. Computed and measured autoignition delays agree well in trends and magnitudes in various ignition processes of pilot diesel in the mixture of methane and air.

关 键 词：着火 数值模拟 柴油 双燃料发动机 

分 类 号：TK412[动力工程及工程热物理—动力机械及工程]