摘要
本文利用线性不稳定性理论，在较大的韦伯数（Ｗｅ）和雷诺数（Ｒｅ）范围内对液体射流的结构特征进行了理论分析。研究结果表明：在一定的韦伯数和雷诺数条件下，射流的高阶模式将成为最不稳定模式，射流的结构也将相应表现出该模式的特征；雷诺数减小对各阶模式有不同程度的抑制作用，对零阶模式抑制较大，对高阶模式抑制较小，这是导致高阶模式成为最不稳定模式的原因；在小韦伯数和大雷诺数情况下，各阶模式几乎同样不稳定，这时射流的结构对射流初始扰动的性质非常敏感，当初始扰动中某一模式明显占优势时，射流结构就会呈现出该模式的结构特征。本文还在实验中成功地捕摄到了具有高阶模式结构特征的射流结构，并验证了小韦伯数和大雷诺数情况下，射流的结构对射流初始扰动的高度敏感性。
The structural characteristics of a liquid jet are studied within a wide range of Weber number and Reynolds number by the theory of linear instability.It is demonstrated that each high mode can become the most unstable one at a specific Weber number and Reynolds number and thus the structure of the jet should possess the characteristics of the corresponding mode.The degree of suppression effect due to decrease in Reynolds number on the growth rate of distrubance is different for different modes,being higher for zero mode and lower for higher modes.This is the reason why higher modes become the most unstable ones.It is also demonstrated that the degree of instability of all modes is almost the same when the Weber number is small and the Reynolds number is large.In this case,the jet structure is very sensitive to the charateristics of the initial disturbance.When one mode of the initial distubance is dominant,the structure of the jet will likely have the characteristics of this mode.Some jet structures characterized by high modes have been obtained in the authors' experiments,showing the high sensitivity of the jet structure to the initial disturbance.
出处
《燃烧科学与技术》
CAS
CSCD
1996年第4期307-314,共8页
Journal of Combustion Science and Technology
基金
攀登计划的资助
关键词
射流
雾化
结构特征
液体射流
Combustion process,Atomization,Structural characteristic of jet
