论文部分内容阅读
一、前言前一篇文章着眼于发火前的喷雾状态,用高速摄影的手段研究到达距离及喷雾角。但是在论述涡流强度和整机性能的匹配条件时,喷雾状态不是唯一的条件,一般公认,与喷射时间相比,滞燃期相当短,因此决定匹配条件必须包含发火后的火焰移动,未被利用空气的混合以及与燃烧气体的干涉现象。本试验可以使涡流强度在较大范围內变化,应用了定容燃烧器模拟实机压缩终了时的压力和温度。对于不同孔数的喷咀测定其涡流强度变化时的滞燃期、最高压力、NO_x浓度等等燃烧特性,并进一步研究不同喷孔时涡流对燃烧特性的影响。另外还使燃烧状态可视化,结合前一篇文章所表
I. Preface The previous article focused on the state of pre-ignition spray and used high-speed photography to study the reach and spray angle. However, when discussing the matching conditions of the eddy current intensity and the overall performance, the state of spray is not the only condition. It is generally accepted that the ignition delay is relatively short compared with the injection time. Therefore, it is determined that the matching condition must include flame movement after ignition, Use of air mixing and interference with combustion gases. This test can make the eddy current intensity in a wide range of changes, the application of constant volume burners to simulate the real machine when the compression end pressure and temperature. The combustion characteristics of the nozzle with different number of holes, such as the retardation, the maximum pressure and the concentration of NOx, were measured when the eddy current intensity was changed. The influence of eddy current on the combustion characteristics was further studied. In addition, the combustion status is visualized, as shown in the previous article