Experimental study of time-resolved simultaneous velocity and concentration fields of an inclined jet in crossflow
Experimental study of time-resolved simultaneous velocity and concentration fields of an inclined jet in crossflow
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DOI：
10.1016/j.ijheatmasstransfer.2022.122622
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发表时间：
2022
影响因子：
5.2
通讯作者：
Xu Zhang;Kechen Wang;X. Wen;Chuangxin He;Yingzheng Liu;Wenwu Zhou
中科院分区：
文献类型：
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作者：
Xu Zhang;Kechen Wang;X. Wen;Chuangxin He;Yingzheng Liu;Wenwu Zhou
采用PIV（粒子图像测速）和PLIF（平面激光诱导荧光）技术同时测量了斜射流在横流中的时间分辨速度场和浓度场。研究并比较了5种射流-横流速度比（VR = 0.4、0.6、0.8、1.0和1.2）。根据实测结果，分别比较了不同vr下流场和浓度场的平均特征和湍流特征。此外，本文还生动地展示了浓度场和涡度场的时空特征。分析和比较了不同虚拟样机的湍流标量通量项、应变和标量耗散。通过适当正交分解分析，提取了模态结构，进一步说明了流动-浓度动力学。综上所述，在不同的vr下，流动和混合特征表现出不同的模式，但垂直速度与上游剪切层浓度始终存在正相关关系。
The time-resolved velocity and concentration fields of an inclined jet in crossflow (JICF) were measured simultaneously using PIV (particle image velocimetry) and PLIF (planar laser-induced fluorescence) techniques. Five jet-to-crossflow velocity ratios were studied and compared (VR = 0.4, 0.6, 0.8, 1.0 and 1.2). Based on the measurement results, average and turbulent features of flow and concentration fields at various VRs were compared respectively. Moreover, the spatio-temporal characteristics of concentration and vorticity fields were vividly shown in this paper. The turbulent scalar flux terms, the strain, and scalar dissipation were analyzed and compared between different VRs. And through POD (proper orthogonal decomposition) analysis, the modal structures were extracted and the flow-concentration dynamics were further illustrated. In conclusion, the flow and mixing characteristics show different patterns at various VRs, but a positive correlation always exists between the vertical velocity and the concentration in the upstream shear layer.