Gas exchange process of two-stroke engine based on multi-objective optimization
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摘要: 二冲程航空活塞发动机的换气过程直接影响燃烧效果和发动机性能,以某二冲程航空活塞发动机为例,建立仿真模型,基于动力性能、经济性能、扫气性能进行多目标优化,对扫气道、排气道结构参数的不同组合优化分析。另外,还对不同海拔工况点下(转速为5 600 r/min,100%节气门开度)的气道结构参数进行优化。结论表明:使用NSGA-Ⅱ算法对发动机气道结构的优化可以有效提高扫气效率和功率,优化后(转速为5 600 r/min)分别为0.841 kW和2.712 kW,燃油消耗率降低22.08
;另外,在不同海拔工况点中,随着海拔高度的增加扫气道长度呈现出减短的趋势,而排气道长度逐渐增加,且在海拔高度大于1 800 m时趋势变化更加明显。Abstract: The gas exchange process of two-stroke aviation piston engine directly affects the combustion effect and the performance of the engine.Taking a two-stroke aviation piston engine as an example,a simulation model was established,and multi-objective optimization based on dynamic performance,economic performance,and scavenging performance was conducted.The optimization analysis of structure parameters of scavenging ducts and exhaust ducts was also performed.In addition,the parameters of the ducts structure under different altitude operating conditions (speed of 5 600 r/min,100% throttle opening) were optimized.The conclusion showed that the optimization of the engine ducts structure using the NSGA-Ⅱ algorithm can effectively improve the engine scavenging efficiency and power (speed of 5 600 r/min),by 0.841 kW and 2.712 kW respectively,and reduce the fuel consumption by 22.08 ;in addition,under different altitude operating conditions,as the altitude increased,the length of the scavenging duct showed a trend of decrease,while the length of the exhaust duct gradually increased,and the trend changed more obviously when the altitude was greater than 1 800 m. -
[1] SHER E.Scavenging the two-stroke engine[J].Progress in Energy and Combustion Science,1990,16(2):95-124. [2] MITTAL V.Design parameters for small engines based on market research[R].SAE Technical Paper 2018-01-1717,2018. [3] TURNER J W G,HEAD R A,CHANG J,et al.2-Stroke engine options for automotive use:a fundamental comparison of different potential scavenging arrangements for medium-duty truck applications[J].SAE Technical Paper 2019-01-0071,2019. [4] 陈波,刘玮,张岩,等.气阀式二冲程柴油机扫气过程仿真[J].内燃机学报,2019,37(5):434-440. [5] BRYNYCH P,MACEK J,NOVELLA R,et al.Representation of two-stroke engine scavenging in 1D models using 3D simulations[J].SAE Technical Paper 2018-01-0166,2018. [6] 张备,王天友,崔磊,等.二冲程船用柴油机稳态扫气流动特性[J].内燃机学报,2019,37(3):228-235. [7] 鲁雪田,张付军,章振宇,等.基于遗传-支持向量机的对置活塞二冲程柴油机气口高度优化[J].航空动力学报,2019,34(11):2387-2394. [8] 郭栋,骞剑策,赵振峰,等.航空活塞二冲程发动机的可变排气阀换气过程[J].航空动力学报,2020,35(3):471-481. [9] 王昌盛,额日其太,丁文豪.高超声速轴对称进气道多目标优化设计[J].航空动力学报,2020,35(7):1392-1401. [10] 高翔,李密,王定奇.发动机进排气系统对飞机气动特性影响的数值研究[J].航空动力学报,2020,35(5):1000-1008. [11] 宋金瓯,吕刚,宋崇林.内燃机中的流体运动[M].天津:天津大学出版社,2015. [12] 董雪飞,赵长禄,张付军,等.对置活塞二冲程柴油机换气过程的试验[J].内燃机学报,2015,33(4):362-369. [13] 周龙保.内燃机学[M].北京:机械工业出版社,2010. [14] 戈登·珀维斯·布莱尔.二冲程发动机设计与模拟[M].贾滨,秦静,李树花,等译.天津:天津大学出版社,2018. [15] 胡春明,郝蒙蒙.无人机活塞式发动机进排气系统优化[J].航空动力学报,2018,33(4):1009-1016. [16] DEB K D,PRATAP A,AGARWAL S,et al.A fast and elitist multiobjective genetic algorithm:NSGA-Ⅱ[J].IEEE Transactions on Evolutionary Computation,2002,6(2):182-197. [17] 曾丽芳,胡建新,潘定一,等.亚声速无人机S弯进气道的多点多目标优化设计[J].推进技术,2021,42(3):495-504. [18] 罗旭.基于帕累托优化的电动汽车变流器设计研究[D].广州:华南理工大学,2019.
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