OP2S双燃料发动机气口匹配特性研究  

Study on port matching characteristic of the OP2S dual-fuel engine

作　　者：杨伟[1] 马富康[1] 许俊峰[1] 邹润[1] 徐洋 李峰[1] YANG Wei;MA Fukang;XU Junfeng;ZOU Run;XU Yang;LI Feng(Shool of Energy and Power Engineering,North University of China,Taiyuan 030051,China;China North Engine Research Institute(Tianjin),Tianjin 300400,China)

机构地区：[1]中北大学能源与动力工程学院,太原030051 [2]中国北方发动机研究所(天津),天津300400

出　　处：《重庆理工大学学报（自然科学）》2024年第4期275-282,共8页Journal of Chongqing University of Technology：Natural Science

基　　金：山西省基础研究计划项目(20210302123072,202103021223204)。

摘　　要：对置活塞二冲程(OP2S)发动机是一种结构可调性较高的动力系统,采用等效二冲程方法建立并校验了OP2S柴油机的一维仿真模型,研究了不同甲醇含量下进排气口高度冲程比对OP2S柴油机动力性能、燃油经济性、换气性能和排放性能的影响。结果表明:OP2S柴油机具有换气性能和排放性能的双“trade-off”关系。甲醇含量增加会促进经济性能的提高和动力性能的降低,也会促进扫气效率的增加和捕获率的降低。进排气口的匹配设计是提升OP2S柴油机性能的关键之一。进气口通过增加新鲜空气主动促进燃烧,而排气口通过减少能量和新鲜充量损失被动改善换气性能。随着气口高度的增加,OP2S柴油机的性能曲线具有双转捩点。将性能曲线分为3个区域,其中第2区域为最佳性能区,该区域对应的进/排气口高冲程比分别为0.056~0.122和0.078~0.100。The global climate change is becoming increasingly severe,and carbon dioxide emissions are gradually increasing in fluctuations.The world energy is gradually developing in a low-carbon and clean direction.For the main force of global industrial power,the internal combustion engine,improving efficiency and reducing emissions are still the main theme of its adaptation to energy development and environmental protection.At the 21st United Nations Climate Change Conference,countries reached a consensus to limit the increase in global average temperature to less than 2℃and achieve the global carbon neutrality goal from 2050 to 2100.This has brought great challenges to the internal combustion engine industry,requiring it to make breakthroughs in many aspects such as basic working principles and fuel types.The opposed piston two stroke(OP2S)diesel engine is a cylinder headless and valve-less engine,which has attracted attention for its simple structure,high power density,high thermal efficiency and low heat transfer loss.Combined with dual-fuel combustion technology,the OP2S diesel engine exhibits strong operating and cost advantages,making it ideal for future high-performance engine needs.The OP2S diesel engine usually adopts a valve-port uniflow scavenging.This scavenging mode will bring the high residual exhaust gas during the working process,which is not conducive to the clean combustion of the engine.Oxygenated methanol can reduce the air demand of OP2S diesel engines and reduce the residual exhaust gas.The full utilization of methanol’s advantages depends on the design of the scavenging system,especially the design of the intake and exhaust ports.Therefore,under the dual-fuel strategy,the primary attention is to the matching characteristics of the intake and exhaust ports.So this work applies the GT-POWER to simulate the working process.As there is no OP2S cylinder module in GT-POWER,we develop an equivalent method through the two-stroke diesel engine model.The equivalent model complies with these principles:�

关 键 词：对置活塞二冲程 甲醇柴油 气口高度 换气性能 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]