非淹没性低速圆射流特性研究

Study on the Characteristics of Non-submerged Round Jet

介绍了射流的基本概念、射流的分类和圆射流断裂理论。结合韦伯和列维奇半经验计算公式,在不同射流速度下,对两种孔径的孔口(d0=2mm和3.4mm)进行了非淹没性圆射流特性研究,并做了射流断裂长度的测定。通过实验值和半经验计算值的相互比较,结果显示,在较慢的射流速度下,用韦伯给出的半经验公式计算出的射流断裂长度值和实验值较接近。而在速度稍大一些时,用列维奇给出的公式计算出的射流长度值和实测值吻合得较好。

This paper introduced the concept and classification of the jet, and the fracture theory of the round jet. Combing with semi - empirical formula of Levich and Webber, in different jet velocity, using two different openings （ d0 = 2mm and 3.4mm）, this paper studied on the characteristics of non - submerged round jet, and made measurement of the length breakup of the jet. Through comparing the experimental data and the value of semi - empirical calculation each other, the results showed that, in the low velocity, using the semi - empirical formula of Weber, the value of breakup length approached to the actual value. At the higher velocity, the semi - empirical formula of Levich was good.