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本文对简单直射式喷嘴在均匀横向气流中,喷雾特性随空气速度、喷嘴压降和喷孔直径的变化进行了试验研究。在均匀流场中,试验结果表明这些影响因素是相关的。在经验关系式中,这些项的指数不是常数。根据大量的试验数据,推导出索太尔平均直径的经验关系式如下: SMD∞Va~(-1.59-0.0044ΔP_f-0.1d)·ΔP_f~(-0.13-0.025d+0.34Mα)·d~(0.36-0.55Mα-0.0032ΔP_f) 对于小孔径喷嘴,尺寸分布指数N(R-R分布)随着空气速度的增加,先减小到某一最小值后,又开始增大,而对于大孔径喷嘴,N值随空气速度增加而不断下降。随着孔径和喷嘴压降的增加,N值总是下降的。 试验证明,简单直射式喷嘴在横向气流中的雾化特性是压力露化特性(在低空气流速时)和空气雾化特性(在高速气流流速时)的综合。
In this paper, a simple direct-jet nozzle in a uniform transverse flow, the spray characteristics with the air velocity, nozzle pressure drop and nozzle diameter changes were studied. In a uniform flow field, the experimental results show that these influencing factors are relevant. In empirical relationships, the exponents of these terms are not constant. According to a large number of experimental data, the empirical relationship between the average Sothir’s diameter is derived as follows: SMD ∞ Va ~ (-1.59-0.0044 ΔP_f-0.1d) · ΔP_f ~ (-0.13-0.025d + 0.34Mα) · d ~ 0.36-0.55Mα-0.0032ΔP_f) For a small aperture nozzle, the size distribution index N (RR distribution) decreases to a certain minimum with the increase of the air velocity and then begins to increase. For the large aperture nozzle, N The value decreases with increasing air velocity. As the aperture and nozzle pressure drop increase, the N value always decreases. Experiments have shown that the atomization characteristics of a simple direct-fired nozzle in a cross-flow are a combination of pressure-dew-forming characteristics (at low air flow rates) and air atomization characteristics (at high-speed air flow rates).