超临界环境条件对碳氢燃料液滴燃烧特性的影响

The Effect of Supercritical Ambient Conditions on Hydrocarbon Fuel Droplet Combustion Characteristics

利用开发的液滴燃烧模型,研究了环境压力、温度以及液滴初始温度对液滴燃烧特性的影响。结果表明:在燃料的临界压力下液滴的燃烧寿命最短。随着环境压力的升高,着火延迟逐渐缩短,火焰半径逐渐减小,并且火焰温度在快速上升期的上升速度逐渐减慢。随着环境温度的升高,液滴寿命和着火延迟均逐渐变短,火焰半径逐渐增大。随着液滴初始温度的升高,液滴寿命和着火延迟均线性减小,液滴初始温度只会使液滴的燃烧过程整体提前或延后。

The effects of ambient pressure,ambient temperature and initial droplet temperature on the droplet combustion characteristics were investigated via the developed droplet combustion model.The results show that,the droplet combustion lifetime is the shortest at the critical pressure of the fuel.With the increase of the ambient pressure,ignition delay gradually shortened,the flame radius is gradually reduced,and the rising speed of flame temperature in the fast-rising period gradually slows down;With the ambient temperature increases,droplet combustion lifetime and ignition delay is gradually shorten,the flame radius increases;with the initial droplet temperature increases,both droplets combustion lifetime and ignition delay almost linearly reduces,the initial droplet temperature impacts on the advance and delay of the whole droplet combustion process.