摘要
喷嘴中流体在高速运动时,壁面的形貌结构对流场的影响很大。因此,建立了风琴管空化喷嘴物理模型,利用Fluent对风琴管喷嘴内部空化流动特性数值模拟,分析了喷嘴内壁粗糙度对空化性能的影响,研究发现,喷嘴出口收缩段wall2处存在局部低压区域,出口收缩段wall2处发生明显空化现象;随着壁面粗糙度的增加,出口截面速度分布趋势大体相同,出口速度整体减小,局部低压区域也相应减小,气体体积分数减小,空化效果减弱。
When the fluid is moving at high speed, the shape and structure of the wall surface have great influence on the flow field. Therefore, a physical model of the typical organ pipe nozzle was established,and a comparative analysis of the model under the same parameters with different roughness was completed. The results show that the local low pressure area is appeared at the nozzle throat, and the cavitation happened at the position named wall2; with the increases of wall roughness, The outlet velocity distribution trend roughly the same, and the rate is reduced; Local low pressure area is narrowed; The vapor volume fraction is decreased and the development of cavitation is slowed.
出处
《科技通报》
北大核心
2017年第6期100-104,213,共6页
Bulletin of Science and Technology
基金
宜昌市科技局项目(A14-302-a03)
武汉理工大学船舶动力工程技术交通部重点实验室开放基金(JTHYWHCB1301)资助
