Experimental investigation of the interaction between a plane wall jet and a parallel offset jet |
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Authors: | X K Wang S K Tan |
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Institution: | (1) Maritime Research Centre, Nanyang Technological University, Singapore, Singapore, 639798 |
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Abstract: | The dual-jet flow generated by a plane wall jet and a parallel offset jet at an offset ratio of d/w = 1.0 has been investigated using Particle Image Velocimetry (PIV). The particle images are captured, processed, and subsequently
used to characterize the flow in terms of the 2D velocity and vorticity distributions. Statistical characteristics of the
flow are obtained through ensemble averaging of 360 instantaneous velocity fields. Also presented is a time series of instantaneous
flow fields to illustrate the dynamic interaction between the two jets. Results reveal that the near field of the flow is
characterized by a periodic large-scale Karman-like vortex shedding similar to what would be expected in the wake of a bluff
body. The existence of the Karman-like vortices results in periodic interactions between the two jets; in addition, these
vortices produce noticeable impact on the jet outer layers, i.e., the free shear layer of the offset jet and the wall boundary
layer of the wall jet. A schematic of vortex/shear layer interaction is proposed to illustrate the flow pattern. |
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