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为了研究燃油在横向高温气流中的雾化特性,使用粒子图像测速系统(PIV)及数字图像处理技术对直射式喷嘴垂直喷入高温气流中形成的油雾场进行了图像测量和分析。试验研究了不同喷射压力、气流温度对粒径分布、下游不同区域SMD及空间分布均匀性的影响。试验结果表明:(1)提高喷射压力,基本不会改变颗粒PDF分布;(2)高温气流中,喷射压力的提高,反而会导致测量到的液滴相颗粒数目减少,但颗粒的SMD也在减小;(3)在高温气流流动方向不同区域,气动雾化颗粒破碎效应和蒸发导致的颗粒尺寸减小的行为是竞争关系。
In order to study the atomization characteristics of fuel in horizontal high temperature gas flow, the particle image velocimetry system (PIV) and digital image processing technology were used to measure and analyze the oil mist field formed by the direct injection of the jet nozzle into high temperature air. The influence of different injection pressure and temperature on the particle size distribution and the SMD and spatial distribution uniformity in different downstream regions was studied. The experimental results show that: (1) the injection pressure is increased without changing the particle PDF distribution; (2) the increase of the injection pressure in the high-temperature gas flow will lead to the decrease of the number of droplet phase particles measured, but the particle SMD Decreases; (3) In different regions of high-temperature airflow, the effect of particle breaking by aerodynamic atomization and decrease of particle size by evaporation are in competition.