摘要
为了研究二甲醚/柴油双燃料发动机在不同喷油提前角及喷孔直径下的缸内燃烧特性和排放性能影响,以电控改造后4190Z_(L)C-2型中速柴油机为试验平台,建立仿真模型,并验证其准确性。结果表明:喷油提前角从16.6°CA BTDC增加到22.6°CA BTDC,缸内压力和温度曲线增大,放热率前移,但其峰值有所下降。通过缸内速度场和温度场云图可知,速度场分布规律与缸内压力和温度曲线相同,温度场升高速率提升,油气混合更为充分,提高了发动机动力性,同时NO排放显著增加,CO排放无明显变化,CH_(2)O排放略有降低。随着喷油孔直径减小,油束形成更为细小液滴,蒸发雾化过程速率加快,喷入缸内气体混合更加充分,燃烧更旺盛,缸内爆发压力和最高温度都呈上升趋势。缸内湍流动能增大,提升混合气体的质量。缸内温度小幅上升,soot排放得到抑制,NO排放略有增加,指示油耗率出现先减少后增加趋势,指示功率则是先增加后减少。该研究对DME/柴油发动机性能研究提供理论基础。
In order to study the effects of in-cylinder combustion characteristics and emission performance of DME/diesel dual-fuel engine under different injection advance angles and orifice diameters,an electronically modified 4190Z_(L)C-2 medium-speed diesel engine as a test platform after electric control transformation is established and its accuracy is verified.The results show that:the injection advance angle increases from 16.6°CA BTDC to 22.6°CA BTDC,the in-cylinder pressure and temperature profiles increase,and the exothermic rate shifts forward,but its peak value decreases.The velocity field and temperature field cloud diagrams show that the velocity field distribution pattern is the same as the pressure and temperature curves in the cylinder,and the temperature field elevation rate increases,the oil and gas mixing is more adequate,which improves the engine dynamics,and at the same time,the NO emission increases significantly,the CO emission does not change significantly,and the CH_(2)O emission decreases slightly.As the diameter of the injection hole decreases,the oil beam forms finer droplets,the evaporation atomisation process speeds up,the gas mixture into the cylinder is more adequate,the combustion is more vigorous,the cylinder burst pressure and the maximum temperature are on the rise.In-cylinder turbulence kinetic energy increases,improving the quality of the gas mixture.The in-cylinder temperature increases slightly,soot emission is suppressed,NO emission increases slightly,the indicated fuel consumption rate shows a trend of decreasing and then increasing,while the indicated power increases and then decreases.In conclusion,the study on DME/diesel engine performance research provides the theoretical foundation.
作者
黄朝霞
邓涛
黄加亮
范金宇
李品芳
叶子枭
HUANG Zhaoxia;DENG Tao;HUANG Jialiang;FAN Jinyu;LI Pinfang;YE Zixiao(Jimei University,School of Science,Xiamen 361021,Fujian,China;Jimei University,Marine Engineering Institute,Xiamen 361021,Fujian,China;Faculty of Maritime and Transportation,Ningbo University,Ningbo 315211,Zhejiang,China;Fujian Provincial Key Laboratory of Naval Architecture and Ocean Engineering,Xiamen 361021,Fujian,China)
出处
《船舶工程》
CSCD
北大核心
2023年第10期1-8,133,共9页
Ship Engineering
基金
福建省自然科学基金资助项目(2020J01690,2021J01849,2022J01812)
集美大学国家自然科学基金培育项目(ZP2021008)。
关键词
二甲醚/柴油
喷油提前角
喷孔直径
指示功率
燃油消耗率
NO排放
dimethyl ether/diesel oil
injection advance angle
diameter of orifice
indicated power
fuel consumption rate
NO emission
