Impact of diesel pilot distribution on the ignition process of a dual fuel medium speed marine engine

被引:69
作者
Garcia Valladolid, Pablo [1 ]
Tunestal, Per [1 ]
Monsalve-Serrano, Javier [2 ]
Garcia, Antonio [2 ]
Hyvonen, Jari [3 ]
机构
[1] Lund Univ, Dept Energy Sci, Ole Romers Vag 1, S-22363 Lund, Sweden
[2] Univ Politecn Valencia, CMT Motores Term, Camino Vera S-N, E-46022 Valencia, Spain
[3] Wartsila Finland Oy, POB 244,Jarvikatu 2-4, Vaasa 65101, Finland
关键词
Dual fuel; Pilot ignition; Natural gas; Mixing process; COMBUSTION STRATEGIES; 1D MODEL; EMISSIONS; GEOMETRY; SPRAYS; LOAD; RCCI;
D O I
10.1016/j.enconman.2017.07.023
中图分类号
O414.1 [热力学];
学科分类号
摘要
Recent emission legislation in the marine sector has emphasized the need to reduce nitrogen oxides (NOx) emissions as well as sulphur emissions. The fulfilment of emission legislation limits with conventional marine diesel oil (MDO) requires complex and expensive aftertreatment systems and in this framework lean burn pilot ignited dual fuel (diesel and natural gas) is revealed as one of the most suitable engine platforms to decrease pollutant formations at its source and therefore to mitigate aftertreatment system requirements. For this reason, an experimental study has been carried out in an 8.8 l dual fuel single cylinder Wartsila 20DF engine in order to evaluate different diesel equivalence ratio distributions in the combustion chamber and to get a deeper insight into the interaction between the high reactivity (diesel) and the low reactivity (natural gas) fuels during the ignition process. Engine testing has been complemented with diesel spray pattern simulations for a better understanding of local combustion conditions. Results show the importance of local pilot fuel distribution as a way to control combustion phasing and consequently its impact on combustion instability, emissions and knock conditions. Stable combustion with engine-out NOx levels below legislation have been achieved without the need of after-treatment system using appropriate high reactivity fuel (HRF) distribution control. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码:192 / 205
页数:14
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