论文部分内容阅读
对增压柴油机性能进行改进,需要对气缸内燃气的内部气体热力化学以及燃烧量和外部件之间产生的相互影响有很好的了解。目前,各种模拟研究正在进行,而其可行性则需经过深入地实验验证。本文介绍测量工作的第1阶段。该项工作涉及到1台单缸机排气速度场特性的研究。测量中使用了1台两点式测速仪:测量两个相距200μm、直径为20μm 的焦点间的亚微细粒的飞行时间。对观察窗加以保护,以免炭烟沉积,通过测量中的闪光测频的触发来记录随曲轴转角变化的瞬时局部速度。所取得的测量结果不仅表明了气门状态(开启和关闭)对气缸排气过程的影响,而且也表明了扫气对气缸排气过程的影响。
Improving the performance of a turbocharged diesel engine requires a good understanding of the thermochemical chemistry of the internal gas in the cylinder as well as the interaction between the amount of combustion and the external components. At present, various simulation studies are underway, and its feasibility needs to be further verified experimentally. This article describes the first phase of measurement. This work involves the research of the exhaust velocity field characteristics of a single-cylinder engine. A two-point tachometer was used for the measurement: the time-of-flight of submicron particles between two focal spots of 200 μm diameter and 20 μm diameter was measured. The viewing window is protected from soot deposition and the instantaneous local velocity as a function of the crank angle is recorded by the triggering of the flash frequency measurement in the measurement. The measurements obtained show not only the effect of the valve state (on and off) on the cylinder exhaust but also the effect of scavenging on the cylinder exhaust.