Numerical investigation of cavity diameter ratio influence on Helmholtz oscillation waterjet

被引：2
作者：
Fang Z.-L. [1 ,2 ]
Kang Y. [1 ,2 ]
Wang X.-C. [1 ,2 ]
Liu W.-C. [1 ,2 ]
Li D. [1 ,2 ]
Zhou Y.-X. [1 ,2 ]
机构：
[1] School of Power and Mechanical Engineering, Wuhan University, Wuhan
[2] Key Laboratory of Hubei Province for Water Jet Theory and New Technology, Wuhan University, Wuhan
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2016年 / 50卷 / 11期
关键词：
Cavity diameter ratio; Coherent structure; LES; Self-excited oscillation waterjet;
D O I：
10.3785/j.issn.1008-973X.2016.11.009
中图分类号：
学科分类号：
摘要：
Large eddy simulation(LES) was conducted to investigate its flow characteristics in order to improve the working ability of Helmholtz self-excited oscillation pulsed jet(SOPJ). The reliability of numerical simulation was verified by experimentally measuring the pulsating pressures at nozzle outlet. The results of four models of different cavity diameter ratios were analyzed under three Reynolds numbers. The vortex motion characteristics were investigated by considering the coherent structrue (Q criteria number). The fluidic beam concentration and energy dissipation in the chamber were evaluated based on the axial velocity attenuation and velocity distribution profiles. The pulse performance was analyzed according to the oscillation amplitude. Results show that LES can reasonably simulate the unsteady flow field of SOPJ. Helmholtz cavity turns uniform flow into turbulence flow, the scale of verity increases, and the energy dissipation inside the cavity can be intensified. The ratio of cavity diameter to jet diameter is of great significance. © 2016, Zhejiang University Press. All right reserved.
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页码：2100 / 2106and2157
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