Experimental investigation of influence of Reynolds number on synthetic jet vortex rings impinging onto a solid wall
Experimental investigation of influence of Reynolds number on synthetic jet vortex rings impinging onto a solid wall
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雷诺数对撞击固体壁的合成射流涡环影响的实验研究
DOI：
10.1007/s00348-016-2287-5
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发表时间：
2016-12
影响因子：
2.4
通讯作者：
Wang JinJun
中科院分区：
文献类型：
--
作者：
Xu Yang;He GuoSheng;Kulkarni Varun;Wang JinJun
采用时间分辨粒子图像测速技术研究雷诺数 (Resj) 对撞击固体壁的合成射流涡环的影响。在其他参数保持不变的情况下，研究了从 166 到 664 的四个雷诺数进行比较。研究发现雷诺数对撞击合成射流近壁涡旋结构的空间演化有显着影响。速度三元分解表明，撞击涡环和二次涡环产生的周期性雷诺剪应力均符合四象限型分布规律，并且随机速度脉动随着Resjin的增加而增强。对于径向壁射流，径向速度分布对于所有Resj表现出自相似行为，并且随着Resj的增加，这种自相似分布逐渐偏离层流解。特别是，lowResj(166) 的自相似轮廓与层流解一致，表明涡环产生的周期性速度波动对层流壁射流的速度轮廓影响很小。这也提供了证据表明，对于层流来说，撞击合成射流在混合方面比连续射流更有效。对于highResj，平均表面摩擦系数在达到峰值后衰减速率较慢，并且径向动量通量在远离撞击区域的位置具有较高的值，这两者都可以归因于随机波动的增强。
Time-resolved particle image velocimetry was employed to study the effect of Reynolds number (Resj) on synthetic jet vortex rings impinging onto a solid wall. Four Reynolds numbers ranging from 166 to 664 were investigated for comparison while other parameters were kept constant. It is found that the Reynolds number has a significant impact on the spatial evolution of near-wall vortical structures of the impinging synthetic jet. Velocity triple decomposition reveals that periodic Reynolds shear stresses produced by both impinging and secondary vortex rings agree well with a four-quadrant-type distribution rule, and the random velocity fluctuations are strengthened asResjincreases. For radial wall jet, radial velocity profiles exhibit a self-similar behavior for allResj, and this self-similar profile gradually deviates from the laminar solution asResjis increased. In particular, the self-similar profile for lowResj(166) coincides with the laminar solution indicating that periodic velocity fluctuations produced by vortex rings have little effect on the velocity profile of the laminar wall jet. This also provides evidence that the impinging synthetic jet is more effective in mixing than the continuous jet for the laminar flow. For the highResj, the mean skin friction coefficient has a slower decay rate after reaching peak, and the radial momentum flux has a higher value at locations far away from the impingement region, both of these can be attributed to the enhanced random fluctuations.
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DOI：
10.1016/s0065-2717(08)70221-1
发表时间：
1977
期刊：
Advances in heat transfer
影响因子：
--
作者：
H. Martin
通讯作者：
H. Martin
影响因子：
4.6
作者：
Wontae Kim;J. Yoo;J. Sung
通讯作者：
Wontae Kim;J. Yoo;J. Sung
DOI：
--
发表时间：
1962
期刊：
--
影响因子：
--
作者：
R. Gardon
通讯作者：
R. Gardon
影响因子：
1.7
作者：
K. Judd;I. Savelyev;Qi Zhang-;R. Handler
通讯作者：
K. Judd;I. Savelyev;Qi Zhang-;R. Handler
影响因子：
3.7
作者：
J. Walker;C. R. Smith;A. W. Cerra;T. Doligalski
通讯作者：
J. Walker;C. R. Smith;A. W. Cerra;T. Doligalski