水下氣體射流技術的柱形與環(huán)形結構仿真分析
[Abstract]:As a complex two-phase flow, underwater gas jet has been widely used in engineering, metallurgy, national defense and other fields. In recent years, due to the application of concentric tube launcher and the concept of water-breaking emission, the research of underwater gas jet has been paid great attention to. However, the research of underwater gas jet is more focused on circular section nozzle and supersonic condition, and the research of circular section nozzle and low velocity bubble underwater gas jet need to be further studied. In this paper, numerical simulation is used to study the underwater gas jet patterns of circular and annular sections under three operating conditions: subsonic, transonic and supersonic. The main contents and work are as follows: (1) A set of numerical simulation models of cylindrical and annular underwater gas jets are established. Combined with the experimental results, the reliability of the numerical simulation model is verified. (2) the numerical simulation of the cylindrical underwater gas jet and the annular underwater gas jet under the three operating conditions of 100 m / s ~ 340m / s air velocity is carried out. (3) A numerical simulation study is carried out. (3) A numerical simulation study is carried out on a cylindrical underwater gas jet and an annular underwater gas jet under three operating conditions. The development process and physical phenomena of cylindrical underwater gas jet and annular underwater gas jet are analyzed. At the same time, the similarities and differences of two different forms of underwater gas jet are compared and analyzed. The experimental and numerical results show that the bubble produced by the (a) cylindrical and annular underwater gas jet is similar to the whole development direction in the annular jet. When the flow velocity is low, the annular bubble; (b), which is different from the cylindrical jet spherical bubble, appears the phenomenon of return stroke at transonic speed. With the increase of jet velocity, the frequency of return stroke increases. As the foundation of underwater gas jet research, this paper lays a foundation for the further study of underwater gas jet.
【學位授予單位】:太原理工大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:O358
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