Design of combustion bowl geometry to meet final Tier 4 of 11 L non-road heavy-duty diesel engine with multi-dimensional combustion simulation
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- 作者：Sangyul Lee ; Jongyoon Lee ; Seungkwon Hwang…
- 关键词：Combustion bowl shape ; Diesel engine ; Non ; road heavy duty diesel engine ; PM ; Soot ; ULPC ; Tier 4
- 刊名：Journal of Mechanical Science and Technology
- 出版年：2016
- 出版时间：September 2016
- 年：2016
- 卷：30
- 期：9
- 页码：4373-4382
- 全文大小：1,691 KB
- 刊物类别：Engineering
- 刊物主题：Mechanical Engineering
Structural Mechanics
Control Engineering
Industrial and Production Engineering - 出版者：The Korean Society of Mechanical Engineers
- ISSN：1976-3824
- 卷排序：30
文摘
To comply with the new non-road emission standards, final Tier 4, two big strategies have been applied to the 11 L heavy-duty diesel engine. The first strategy is to apply Exhaust gas recirculation and selectivity catalytic reduction system to meet the NOx limitation. The other one is to apply low swirl ratio (for higher volumetric efficiency) and multi-hole nozzle, a high pressure direct injection, and an optimized combustion system in order to reduce PM emission. Both strategies put a focus on the optimization of combustion system. In this study, a ULPC bowl concept applied in the previous works has been successfully verified in 11 L heavy-duty diesel engine with wellvalidated 3D combustion simulation, and the ULPC bowl shape has been geometrically optimized. A rough 0D calculation is used to calculate the fuel split ratio of the various ULPC bowl shapes. In the rated-power operating condition of the final Tier 4 engine which is deduced by 1D cyclic simulation, the optimal fuel split ratio of the injected fuel has been verified. Also, additional geometric optimization has been achieved without changing the optimal fuel split ratio. From these results, soot has been reduced by about 30% with ULPC optimum bowl shape against the Tier 3 re-entrant bowl shape.