Flow field characteristics of single round hole pulsed jet based on PIV technology

被引：0

作者：

Shen X. ^{[1
]}

Mao J. ^{[1
]}

Liu F. ^{[1
]}

Fan J. ^{[2
]}

Han X. ^{[1
]}

机构：

[1] Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing

[2] Army Aviation Institution, Army Aviation School, Beijing

来源：

Hangkong Dongli Xuebao/Journal of Aerospace Power | 2020年 / 35卷 / 09期

关键词：

Flow field characteristics; Impinging jet; Particle image velocity measurement; Pulsed jet; Vortex structure;

D O I：

10.13224/j.cnki.jasp.2020.09.006

中图分类号：

学科分类号：

摘要：

The flow field characteristic structure of steady and pulsed jet impinging on the target plate was investigated. High frequency particle image velocity measurement technology was used to measure a steady jet and a pulsed jet with a frequency of 20Hz. Besides, the distance between the jet nozzle and the target plate was 6 times the diameter of the nozzle, and the steady jet inlet Reynolds number was 6000 for both steady and pulsed jet flows. The experiment obtained velocity distribution of the core jet zone, the wall jet zone, and the stagnation zone. The results show that: (1) due to the shear action of the jet, maximum axial fluctuation velocity in the core jet zone of the pulsed jet was nearly three times that of the steady jet. (2) In the stagnation zone, the maximum gradient of the axial velocity of the pulsed jet was approximately twice that of the steady jet, which resulted from the shear action of the jet and the stagnation action of the wall. Furthermore, the maximum fluctuation velocity in the stagnation zone was nearly three times that of the steady jet. (3) The entrainment of the pulsed jet and the propagation of the vortex led to the destruction of the velocity boundary layer in the wall jet region. Compared with the steady jet, the flow field of the pulsed jet increased the energy of the turbulent coherent structure and generated periodic large-scale vortex. © 2020, Editorial Department of Journal of Aerospace Power. All right reserved.

引用

页码：1845 / 1855

页数：10

共 22 条

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