• CN:11-2187/TH
  • ISSN:0577-6686

›› 2012, Vol. 48 ›› Issue (18): 117-123.

• 论文 • 上一篇    下一篇

基于全转速综合性能评价的可变循环发动机配气优化

邸立明;李文跃;夏怀成;赵永生   

  1. 燕山大学车辆与能源学院;燕山大学机械工程学院
  • 发布日期:2012-09-20

Distribution Device Optimization of Variable-cycle Engine Based on Comprehensive Performance Evaluation in All Speed

DI Liming;LI Wenyue;XIA Huaicheng;ZHAO Yongsheng   

  1. School of Vehicle and Energy Sources, Yanshan University School of Mechanical Engineering, Yanshan University
  • Published:2012-09-20

摘要: 针对可变循环发动机(Variable-cycle engine, VCE)二行程模式配气形式的特殊性和配气参数优化问题,以某单缸四行程发动机为基础,建立VCE四行程和二行程工作模式仿真模型,利用缸压试验验证模型的正确性,提出基于多性能评价指标的发动机综合性能量化指标复合性能系数,通过算例和模糊物元法验证了其有效性。根据复合性能系数最大化原则,对VCE二行程模式的三种缸侧排气口方案进行系列化仿真分析,得出在四圆角矩形排气口方案的气口下边沿与下止点重合情况下,当进气门在下止点前46°开启,下止点后86°关闭,排气口宽为30 mm,高为14 mm时,在全转速范围内的综合性能最好。研究表明,复合性能系数能高效地对发动机全转速范围的综合性能进行量化评价比较。

关键词: 参数优化, 可变循环发动机, 性能系数, 综合评价

Abstract: Aiming at the special type and parameters optimization problem of distribution device in two-stroke mode of variable-cycle engine(VCE), the simulation models for four-stroke mode and two-stroke mode of VCE are established based on one single-cylinder four-stroke engine, the accuracy of simulation models is verified with cylinder pressure experiments, the composite performance coefficient for quantizing comprehensive performance evaluation is proposed based on multiple engine performance indexes, and its validity is verified with examples calculation and the method of fuzzy matter element. According to the maximum principle of composite performance coefficient, a series of simulation analysis on three schemes of cylinder exhaust port of two-stroke mode are carried out, draw a conclusion that, while the bottom edge of four rounded rectangle exhaust port coincidence with the bottom dead center,the best comprehensive performance of two-stroke mode in all engine speed is getting when Intake valves open at the 46 degrees crank angle before bottom dead center(BBDC) and close at the 86 after bottom dead center(ABDC), cylinder exhaust port width is 30 mm and height is 14 mm. The results indicate that, the engine performance in all speed can be quantizing comprehensive evaluation and comparison in high efficiency by the composite performance coefficient.

Key words: Comprehensive evaluation, Parameter optimization, Performance coefficient, Variable-cycle engine

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