进气支管对航空活塞发动机进气性能的影响
2021-11-07王振领王全振韩晓标邱晨曦胡靖斌季宏孟建郑斌
王振领 王全振 韩晓标 邱晨曦 胡靖斌 季宏 孟建 郑斌









摘要: 为了提升某型航空活塞式发动机的进气性能,本文构建了一维发动机整机仿真模型,并耦合了进气系统的三维计算模型,研究了进气歧管结构参数变化对发动机进气性能的影响。研究结果表明:当发动机转速为5500r/min、节气门开度为65%时,随着支管长度的增加,发动机各缸平均进气量呈现先增大后减小的趋势,每循环各缸平均进气量最大增加32.075mg,同比增长9.53%。同时,在进气量最大时,与原型机相比,各缸进气均匀性和整机均匀性也有所提升,且改进前后整机进气均匀性提升了23.56%。
Abstract: In order to improve the intake performance of an aero piston engine, a one-dimensional engine simulation model is built, and the three-dimensional calculation model of intake system is coupled to study the influence of intake manifold structure parameters on the intake performance of the engine. The results show that: when the engine speed is 5500r / min and the throttle opening is 65%, with the increase of the length of the branch pipe, the average air intake of each cylinder first increases and then decreases, and the maximum average air intake of each cylinder in each cycle increases by 32.075mg, with a year-on-year increase of 9.53%. At the same time, when the air intake is the largest, the air intake uniformity of each cylinder and the whole machine are also improved compared with the original machine, and the air intake uniformity of the whole machine is improved by 23.56% before and after the improvement.
关键词: 航空活塞式发动机;进气性能;进气歧管;平均进气量;进气均匀性
Key words: aviation piston engine;intake performance;intake manifold;average air intake;intake uniformity
中图分类号:V263.5 文献标识码:A 文章編号:1674-957X(2021)21-0008-04
0 引言
进气系统作为发动机的重要组成部分,其主要作用是为发动机输送清洁、干燥、充足而稳定的空气以满足发动机的需求,同时保证多缸发动机各缸循环进气量的差异不超过应有的范围,以避免对整机性能产生不利的影响。将工质均匀的送入各气缸是检验发动机进气系统设计是否良好的重要条件之一,性能优良的进气系统要尽可能减少流道内的漩涡,减少流动损失的同时,增大各缸进气量,同时保证各缸的新鲜空气尽可能均匀分配,保证整机的动力性、可靠性和排放性能[1]。
对于发动机进气系统的研究一直备受学者的关注。徐斌等[2]利用标定的模型对某型活塞发动机的进气均匀性进行分析,利用定质量流量观察出口压差的方式判断整机的进气均匀性,结果发现各缸进气不均匀程度较大,主要是由于歧管长度设计不合理导致。……
