粘性和空气助力作用对液体碎裂过程的影响

The Effect of Viscosity and Air Assistant on Liquid Breakup Process

进行了静止空气环境和空气助力环境下水膜和汽油油膜射流碎裂过程试验。结果表明,对于瑞利模式液体射流,喷射压力对液体碎裂过程几乎没有直接影响,射流流速是液体碎裂过程的首要影响因素。当射流流速较低时,液体粘性和空气助力作用对液体碎裂过程的影响大体相当,液体粘度的减小和空气助力作用均能够显著缩短射流的碎裂长度,改善一级雾化的效果;当射流流速较高时,液体粘性对液体碎裂过程的影响将大于空气助力作用的影响,随着流速的提高,空气助力对液体碎裂的促进作用将大为减弱。

The water film and gasoline liquid sheet breakup process experiments have been conducted at stationary air medium and air assistant environment.The results showed that liquid breakup processes had no direct concern with injecting pressure, and primary influencing factor was liquid injecting velocities in Rayleigh spray region.The effect degrees of viscosity and air assistant on liquid breakup process were almost the same at lower liquid velocities.The liquid breakup lengths could be distinctly shorten by reducing liquid viscosity or enhancing air assistant,and primary spray quality could be evidently improved.The influence degree of viscosity on liquid breakup processes was lager than one of the air assistant at higher liquid velocities.The air assistant advancing liquid disintegration would be weakened with liquid velocity increases.