高温高压条件下柴油的雾化蒸发特性

利用高速摄影和纹影法，在可变温度和压力的定容燃烧弹中，模拟发动机的实际运转工况，进行了不同喷油压力和背景压力条件下柴油的雾化蒸发特性试验研究，得出一系列热态喷雾图像。研究表明：喷油压力越高，雾注总的贯穿距离、锥角和投影面积越大，但液核的最大贯穿距离、锥角和投影面积变化不大，显著蒸发时刻不断提前，气相部分投影面积增大，混合均匀性改善；随着背景压力的升高，气、液相贯穿距离均下降，雾注总的喷雾锥角增大，雾注面积、液核面积减小。

Atomization and Evaporation Charactertistics of Diesel Fuel under High Temperature and Pressure

An experimental study of diesel atomization and evaporation characteristics under different injection and ambient pressures was carried out in a variable temperature and pressure constant volume vessel to simulate the actual operating condi‐tions of an engine by using high‐speed photography and schlieren method .A series of high‐temperature spray images were ac‐quired .The results showed that the penetration ,cone angle and projection area of diesel spray column increased with the in‐crease of injection pressure ,but those of fuel liquid core hardly changed .In addition ,the significant evaporation timing ad‐vanced ,the gaseous projection area increased and the air‐fuel mixing uniformity improved .With the increase of ambient pres‐sure ,the penetration and projection area of spray column and liquid core decreased ,but the spray cone angle increased .