涡轮增压二冲程汽油机排气系统匹配研究  

Research on Matching of Exhaust System of Turbocharged Two-stroke Gasoline Engine

作　　者：杨学锋 Yang Xuefeng(Project Management Center of Naval Equipment Department,Beijing 100040,China)

机构地区：[1]海军装备部装备项目管理中心

出　　处：《航空科学技术》2019年第6期45-50,共6页Aeronautical Science & Technology

摘　　要：为提高无人机的工作升限,需要补偿高空处下降的功率,涡轮增压技术是航空活塞式发动机实现功率恢复的有效手段之一。二冲程汽油机使用增压技术后存在很多技术难点,尤其是增压后扫气损失的合理控制、扫气方案与排气管路的合理匹配等问题。因此本文通过仿真计算的方法对某型二冲程活塞汽油机,从涡轮增压布置方案、排气管路设计等方面进行了匹配研究,仿真结果表明,二冲程汽油机涡轮增压时涡轮布置在排气膨胀管后可以改善其换气过程;排气膨胀管结构形式及尺寸均对发动机性能有明显影响,且排气膨胀管位于排气歧管后,总长度1.2m,主直径186mm时发动机动力性能最优。In order to improve the working limit of the drone,it is necessary to compensate for the falling power at the high altitude.Turbocharging technology is one of the effective means for the aviation piston engine to achieve power recovery.There are many technical difficulties in the use of supercharging technology for two-stroke gasoline engines,especially the reasonable control of scavenging loss after supercharging,the reasonable matching of scavenging scheme and exhaust piping.Therefore,the simulation calculation method is applied to the matching of a two-stroke piston gasoline engine from the turbocharged layout scheme and the exhaust pipeline design.The simulation results show that when the turbine is arranged in the exhaust,when the two-stroke gasoline engine is turbocharged.After the expansion tube,the ventilation process could be improved;the structure and size of the exhaust expansion tube have a significant impact on the engine performance,and the exhaust expansion tube is located behind the exhaust manifold,with the total length 1.2m and diameter 186mm,the engine power performance is optimal.

关 键 词：二冲程汽油机 涡轮增压 涡轮布置位置 排气膨胀管 

分 类 号：V233[航空宇航科学与技术—航空宇航推进理论与工程]