低速二冲程双燃料船用主机气缸润滑油自燃引发不正常燃烧问题的研究

Study on Abnormal Combustion Caused by Cylinder Oil Auto-ignition in Low-Speed Two-Stroke Dual-Fuel Marine Main Engine

介绍了低速二冲程双燃料船用主机的发展现状,指出气缸润滑油自燃引发不正常燃烧是限制其平均有效压力pme提高的关键因素。研究表明:双燃料主机气缸油自燃引发不正常燃烧的内因有两方面:主机结构特征及工作特性,气缸油破碎、蒸发及自燃特性;而主机工况条件、引燃喷射正时等控制参数、过量空气系数、预混合气均匀度、气缸油消耗率、气缸套表面状况等外因,则是气缸油自燃的触发条件。建议在此基础上开展低速二冲程双燃料船用主机的研发工作。

The development status of low-speed two-stroke dual-fuel marine main engines is introduced. It is pointed out that the abnormal combustion caused by cylinder oil auto-ignition is the key problem to impede the increase of mean effective pressure of the engine. Research results show that abnormal com- bustion caused by cylinder oil auto-ignition of dual-fuel main engine has two internal causes, which are construction and operation characteristics of main engine, as well as cylinder oil crush, evaporation and auto-ignition characteristics; several external causes, including control parameters such as main engine operation condition and pilot injection timing, excess air coefficient, uniformity of pre-mixtures, con- sumption rate of cylinder oil, as well as surface condition of cylinder liner, which are the trigger condi- tions of cylinder oil auto-ignition. It is suggested that the development of low-speed two-stroke dual-fuel marine main engine should be carried out based on the these research results.