不同喷嘴结构下高压脉冲水射流的数值模拟  

Numerical simulation of high pressure pulsed water jet generated by different nozzle structures

作　　者：施红辉[1] 张一博 王天雨 董若凌[1] 冯子龙 彭双双 SHI Honghui;ZHANG Yibo;WANG Tianyu;DONG Ruolin;FENG Zilong;PENG Shuangshuang(Faculty of Mechanical Engineering&Automation,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学机械与自动控制学院,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2021年第3期343-350,共8页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：浙江省基础公益研究项目(LGG19A020002)。

摘　　要：为进一步优化喷嘴结构,应用流体仿真软件Fluent对喷嘴中高压气体驱动的水柱进行数值模拟。在数值模拟方法中应用SST k-ω湍流模型与VOF模型,研究了直喷嘴、锥形渐扩喷嘴和锥形渐缩喷嘴结构下的管内外气/液分布与水射流的流体力学特性。模拟结果表明:直喷嘴水射流在初期有最高的射流速度,且在模拟计算域内平均速度最高;锥形渐扩喷嘴水射流射流速度最小、喷射距离最短,在初期射流横向扩散宽度最大;锥形渐缩喷嘴水射流在初期横向扩散宽度最小,在射流后期水射流速度最高、横向扩张宽度最大。该研究通过数值模拟给出了锥形渐缩及锥形渐扩喷嘴结构下高压脉冲水射流的流体力学行为,为后续进一步分析不同喷嘴结构下的高压脉冲水射流提供了参考。In order to further optimize the nozzle structure, numerical simulation of water column driven by high-pressure gas was carried out by using the simulation software Fluent. SST k-ω turbulence model and VOF model were used to investigate gas/liquid distribution inside and outside the tube and the hydrodynamic characteristics of water jet under the straight nozzle, tapered divergent nozzle and tapered convergent nozzle. The experimental results showed that, the water jet under the straight nozzle had the highest speed and the highest average speed in this simulation domain in the beginning. The water jet under the tapered divergent nozzle had the lowest speed and the shortest jet distance, with the largest transverse width in the beginning. The water jet under the tapered convergent nozzle had the smallest transverse width in the beginning, the highest speed and largest transverse width in the later period. This study simulated the hydrodynamic behavior of high-pressure pulsed water jet under the tapered divergent nozzle and tapered convergent nozzle, which provides a reference for further numerical calculation and theoretical analysis of high-pressure pulsed water jet generated by different nozzle structures.

关 键 词：脉冲水射流 喷嘴结构 流体力学特性 数值模拟 

分 类 号：O0359.1[理学]