喷油压力对电控船用中速柴油机性能的影响-《集美大学学报（自然科学版）》

文章信息/Info

Title:: Influence of Injection Pressure on the Performance of Electronically Controlled Marine Medium Speed Diesel Engine

作者:: 衡伟1; 叶子枭2; 黄加亮2; 3; 范金宇2; 3; （1.厦门海洋职业技术学院航海技术系，福建厦门 330013；2.集美大学轮机工程学院，福建厦门 361021；3.福建省船舶与海洋工程重点实验室，福建厦门 361021）

Author(s):: HENG Wei1; YE Zixiao2; HUANG Jialiang2; 3; FAN Jinyu2; 3; (1.Department of Navigation Technology,Xiamen Ocean Vocational College,Xiamen 361012，China；2.School of Marine Engineering,Jimei University,Xiamen 361021,China；3.Fujian Provincial Key Laboratory of Naval Architecture and Ocean Engineering,Xiamen 361021,China)

Keywords:: electronically-controlled marine diesel engine; fuel injection system; injection pressure; orthogonal experimental design; fuel oil consumption rate; NOx emissions

摘要:: 为了研究船用4190型柴油机电控化改造后，喷油压力对柴油机性能的影响，利用AMESim软件，建立电控燃油喷射系统仿真模型，通过正交试验设计方法安排燃油系统参数仿真计算，以实现燃油喷射特性的优化；同时基于AMESim与AVL_FIRE软件耦合，将优化结果导入柴油机缸内燃烧模型，进行仿真计算，以完成不同喷油压力对柴油机性能影响的综合分析。结果表明，当参数组合为：喷孔直径0.22 mm、凸轮型线速度0.46 mm/（°）、柱塞直径14 mm、高压油管长度1000 mm时，喷油压力为125 MPa；当参数组合为：喷孔直径0.26 mm、凸轮型线速度0.43 mm/（°）、柱塞直径14 mm、高压油管长度800 mm 时，喷油压力为105 MPa。喷油压力提高，改善了柴油机燃烧质量，使得油耗率较原机降低约14.3%与7.2%，但NOx排放质量分数分别升高约50%和11%，因此，需要兼顾柴油机的经济性与动力性进一步优化排放。

Abstract:: The simulation model of electronically controlled fuel injection system was established by using AMESim software based on the electronically-controlled modification of marine type 4190 diesel engine,then the orthogonal test design method was employed to simulate for matching the fuel injection system parameters based on the simulation by taking the fuel injection characteristics as the optimization objective.Finally,the optimized results were introduced into the model for the diesel engine cylinder ombustion by coupling AMESim and AVL_FIRE software to complete the comprehensive analysis of the influence of different injection pressures on the performance of the diesel engine.The simulation results show that the injection pressure is 125 MPa when the diameter of orifice,cam velocity,diameter of plunger and length of high pressure fuel pipe is respectively 0.22 mm,0.46 mm/（°）,14 mm and 1000 mm.Results also show that the diameter of orifice,cam velocity,diameter of plunger and length of high pressure fuel pipe will be respectively 0.22 mm,0.46 mm/（°）,14 mm and 1000 mm when the injection pressure is 105 MPa.It reveals that increase in fuel injection pressure can improve the combustion of the diesel engine and bring about decrements in fuel consumption rate about 14.3% but increments in NOx emissions about 50% and 11%.It suggests that the economy and power of the diesel engine should be taken into account for the optimization of emission control.