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首页> 外文会议>ASME Internal Combustion Engine Division fall technical conference 2012 >MODELING OF IGNITION AND COMBUSTION FOR GLOW PLUG ASSISTED DIRECT INJECTION NATURAL GAS ENGINES
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MODELING OF IGNITION AND COMBUSTION FOR GLOW PLUG ASSISTED DIRECT INJECTION NATURAL GAS ENGINES

机译：火花塞辅助直接喷射天然气发动机点火和燃烧建模

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Direct injection natural gas (DING) engines offer the advantages of high thermal efficiency and high power output compared to spark ignition natural gas engines. Injected natural gas requires some form of ignition assist in order to ignite in the time available in a diesel engine combustion chamber. A glow plug - a heated surface — is one form of ignition assist. Simple experiments show that the thickness of the heat penetration layer of a glow plug is very small (≈10~(-5) m) within the time scale of the ignition preparation period (1-2 ms). Meanwhile, the theoretical analyses reveal that only a very thin layer of the surrounding gases (in micrometer scale) can be heated to high temperature to achieve spontaneous ignition. A discretized glow plug model and virtual gas sub-layer model have been developed for CFD modeling of glow plug ignition and combustion for DING diesel engines. In this paper, CFD modeling results are presented. The results were obtained using a KIVA3 code modified to include the above mentioned new developed models. Natural gas ignition over a bare glow plug was simulated. The results were validated against experiments. Simulation of natural gas ignition over a shielded glow plug was also carried out and the results illustrate the necessity of using a shield. This paper shows the success of the discretized glow plug model working together with the virtual gas sub-layer model for modeling glow plug assisted natural gas direct injection engines. The modeling can aid in the design of injection and ignition systems for glow plug assisted DING engines.
机译：与火花点火天然气发动机相比，直喷天然气（DING）发动机具有高热效率和高功率输出的优势。喷射的天然气需要某种形式的点火辅助，以便在柴油机燃烧室中可用的时间内点火。电热塞（加热的表面）是点火辅助的一种形式。简单的实验表明，在点火准备期间（1-2 ms）的时间内，电热塞的热穿透层厚度很小（≈10〜（-5）m）。同时，理论分析表明，只有极薄的周围气体层（以微米为单位）可以加热到高温，以实现自燃。已经开发出离散化的电热塞模型和虚拟气体子层模型，用于DING柴油机的电热塞点火和燃烧的CFD模拟。本文介绍了CFD建模结果。使用修改为包含上述新开发模型的KIVA3代码获得了结果。模拟了裸露电热塞上的天然气点火。相对于实验验证了结果。还对屏蔽的电热塞上的天然气点火进行了模拟，结果表明了使用屏蔽的必要性。本文展示了离散化电热塞模型与虚拟气体子层模型一起用于电热塞辅助天然气直喷发动机建模的成功案例。该模型可以帮助设计用于电热塞辅助DING发动机的喷射和点火系统。

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