基于可变高增压方式的航空活塞发动机变海拔工作特性仿真研究  

Research on Different Altitude Working Characteristics of An Aviation Piston Engine Based on Variable High Pressure Supercharging Method

作　　者：陈贵升[1] 胡闪 沈颖刚 孙敏 龚航 杨杰[4] CHEN Guisheng;HU Shan;SHEN Yinggang;SUN Min;GONG Hang;YANG Jie(Faculty of Transportation Engineering,Kunming University of Science and Technology,Kunming 650500,China;City College,Kunming University of Science and Technology,Kunming 650051,China;Engineering Training Centre,Kunming University of Science and Technology,Kunming 650504,China;Faculty of Civil Aviation and Aeronautics,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学交通工程学院,昆明650500 [2]昆明理工大学城市学院,昆明650051 [3]昆明理工大学工程训练中心,昆明650504 [4]昆明理工大学民航与航空学院,昆明650500

出　　处：《内燃机工程》2024年第2期43-53,共11页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金项目(52165032)。

摘　　要：以一台直列四冲程压燃式航空活塞发动机为研究机型,通过GT-Power构建一维热力学模型,首先对比研究了不同海拔下固定截面增压(fixed geometry turbocharger,FGT)、可变几何截面增压(variable geometry turbocharger,VGT)和两级可变几何截面增压(twinvariable geometry turbocharger,TVGT)对发动机性能的影响;然后基于搭建的TVGT增压系统,探究了高、低压级VGT叶片开度对发动机变海拔条件下工作特性的影响。结果表明:在不同海拔和转速工况下,发动机匹配TVGT增压系统后,其海拔适应性更佳。针对TVGT系统,在不同海拔下,当高压级VGT叶片开度位于0.2~0.4范围内,低压级VGT叶片开度位于0.6~0.8范围内时可以获得较高的动力性及经济性。通过对高、低压级VGT叶片开度的优化,在巡航工况转速3397 r/min时可在6000 m海拔下实现106.8%的功率恢复目标,可满足发动机对高海拔工作运行的功率恢复要求。Using an inline four stroke compression ignition aviation piston engine as the research model,an one-dimensional thermodynamic model was constructed by using GT Power.Firstly,the effects of fixed cross-section turbocharging(FGT),variable geometry turbocharging(VGT),and two-stage variable geometry turbocharging(TVGT)on engine performance were compared and studied at different altitudes.Then,based on the constructed TVGT turbocharging system,the influence of high and low pressure VGT blade opening on the operating characteristics of the engine under variable altitude conditions was explored.The results show that under different altitude and speed conditions,the engine with a TVGT turbocharging system has better altitude adaptability.For the TVGT system,high power and economy can be achieved at different altitudes when the opening of the high-pressure stage VGT blades is in the range of[0.2,0.4],and the opening of the low-pressure stage VGT blades is in the range of[0.6,0.8].By optimizing the opening of high and low pressure VGT blades,a power recovery target of 106.8%can be achieved at an altitude of 6000 m under cruising conditions at a speed of 3397 r/min,which can meet the power recovery requirements of the engine for maximum working altitude.

关 键 词：压燃式航空活塞发动机 变海拔 两级可变几何截面增压 性能 功率恢复 

分 类 号：V234[航空宇航科学与技术—航空宇航推进理论与工程]