吉林大学学报(工学版) ›› 2022, Vol. 52 ›› Issue (3): 504-514.doi: 10.13229/j.cnki.jdxbgxb20200857
• 车辆工程·机械工程 • 上一篇
张岩1(),刘玮1,张树勇1,裴毅强2(),董蒙蒙2,秦静2,3
Yan ZHANG1(),Wei LIU1,Shu-yong ZHANG1,Yi-qiang PEI2(),Meng-meng DONG2,Jing QIN2,3
摘要:
采用计算流体动力学(CFD)方法对一台二/四冲程可变柴油机在二冲程工作模式下活塞烧蚀的现象进行了研究,分析发现气流运动导致混合气在活塞碗沿处发生燃烧,从而产生了局部高温和局部过高热负荷。设计了两种燃烧室结构形式,通过调整油-气-室的配合以改善燃烧状况,研究发现,增大燃烧室碗口直径可以减少向活塞碗沿上方扩散的混合气,增大混合气在燃烧室内部的扩散空间,从而避免了在活塞碗沿处产生过高热负荷;增大燃烧室凹坑直径则有助于在凹坑内产生涡流,促进混合气的形成,缩短燃烧持续期。模拟计算结果显示,相比于原机,在2800 r/min@46 kW工况下两种优化设计的燃烧室在活塞碗沿上的热负荷得到明显改善,功率分别提高了4.11%和1.96%。加工设计一方案并在相同工况下进行对比试验,结果表明,相对于原机,优化设计后的柴油机油耗降低了6.93%,排气温度降低了21.1 K,活塞表面状态良好,无烧蚀发生。
中图分类号:
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