空气辅助喷射煤油和汽油的喷雾特性对比

摘要

为了解不同燃料对低压空气辅助喷射喷雾特性的影响,以航空煤油和汽油作为燃料,分别在定容弹试验平台上进行了对比试验,分析了喷油压力、环境压力、空气喷射量及燃油喷射量对喷雾特性的影响规律.结果表明:在相同的试验工况下,相比于喷射汽油而言,航空煤油喷雾的贯穿距离更长,且喷雾锥角更小;提高喷油压力会使两种燃料喷雾的贯穿距离和喷雾锥角均增大;增大环境压力时,两种燃料喷雾的贯穿距离均会随之降低,而喷射煤油时的喷雾锥角会随之减小,喷射汽油时喷雾锥角几乎不变;增大空气喷射量或减少燃油喷射量会使两种燃料的喷雾锥角均有降低的趋势,但对贯穿距离的影响并不显著.%In order to research the spray characteristics of low-pressure air-assisted injector using aviation kerosene and gasoline,comparative experiments were conducted using a constant volume bomb.The effects of fuel pressure, ambient pressure,air injection quantity and fuel injection quantity on spray characteristics were analyzed.The results show that under the same experimental conditions,the spray penetration of aviation kerosene is longer and its spray angle is smaller than those of gasoline.The spray angle and penetration of both fuels increase with the increase offuel injection pressure.With the increase of ambient pressure,the spray penetration of both fuels are reduced,and the spray angle of aviation kerosene decreases,while that of gasoline remains; almost unchanged.The spray angle of both fuels show a declined tendency with the increase of air injection quantity or the decrease of fuel injection quantity,but injection quantity has no significant effect on spray penetration.