机械与涡轮增压方式下的农用发动机性能优化分析

Optimization Analysis of the Agricultural Engine Performance under the Mechanical and Turbo-charging Mode

为进一步提升我国农用发动机的工作性能,结合CFD/CAE流体理论,对其性能如何高效发挥展开研究。在深入理解发动机组件连接与功能实现的基础上,以机械增压与涡轮增压的各自特点为借鉴,建立发动机内部空气运动数学模型,进行发动机主要组件的结构参数优化,并合理地加装机械增压装置与涡轮增压装置,形成完整紧凑的发动机结构体系。进行了发动机性能优化检测试验,结果表明:经增压方式优化的发动机运行稳定可靠,不同工况参数试验条件下,其燃油消耗量均有所降低,EGR率相对可提高10.67%;结构紧凑度相对可提高5.80%,发动机的输出效率相对可提高8.13%,整体作业效率保持在95%以上。基于机械与涡轮复合增压方式下的发动机性能优化效果良好,可为类似农用动力装置改善提供参考。

In order to further improve the working performance of China's agricultural engine and realize the intelligent innovation progress of agricultural machinery and equipment,combined with CFD/CAE fluid theory,how to effectively play its performance was studied.On the basis of deeply understanding the connection and function realization of engine components,taking the respective characteristics of supercharging and turbo-charging as reference,the mathematical model of internal air movement of engine was established,the structural parameters of main components of engine were optimized,and the supercharging and turbo-charging devices were reasonably installed to form a complete and compact engine structure system.The engine performance optimization test was carried and it showed that the optimized engine run stably and reliably under different operating conditions,and the fuel consumption was reduced,and the EGR rate could be increased by 10.67%;the structural compactness could be increased by 5.80%,the output power of the engine could be increased by 8.13%,and the overall operation efficiency could be maintained above 95%.The engine performance optimization effect based on the combination of mechanical and turbo-charging mode was good,which would provide references for the improvement of power devices of similar agricultural machinery equipment.