基于可视化系统的直喷天然气发动机喷射及燃烧特性研究

天然气作为一种最有前途的代用燃料在汽车发动机上的应用日益广泛。为提高天然气发动机的燃烧效率,采用缸内直喷技术;并通过位于喷嘴附近的火花塞点燃分层混合气,使天然气发动机在中低负荷下实现稀薄燃烧。对于直喷天然气发动机,研究喷雾贯穿距、喷雾锥角、循环波动和燃烧速度等喷射及燃烧特性具有重要意义。首先设计开发了用于观察天然气喷射及燃烧的可视化系统,拍摄不同实验条件下天然气喷射及燃烧过程。利用实验数据,分析了直喷天然气发动机的喷射及燃烧特性。

Based on the Visualization System of Direct Injection Natural Gas Engine Spray and Combustion Characteristic Research

As one of the most promising alternative fuels, natural gas has been widely used in automotive engines. In order to improve the combustion efficiency of the natural gas engine, the cylinder direct injection technology was adopted, and the stratified mixture was ignited by the spark plug located near the nozzle, which could achieve lean burn under low load in natural gas engine. It had great significance to study the spray and combustion characteristics of direct injection natural gas engine. In this paper, the visualization system was designed toobserve the gas injection and combustion. The natural gas injection and combustion process under different experimental conditions were analyzed. Based on the experimental data, the injection and combustion characteristics of direct injection natural gas engine were analyzed.