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仪器网/ 行业应用/ 解决方案/ 零度和逆向压力梯度环境下涡激励射流的数值模拟

零度和逆向压力梯度环境下涡激励射流的数值模拟

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Numerical simulations of particle image velocimetry (PIV) experiments con-
ducted with vortex generating jets (VGJs) on a °at plate, at a Reynolds number
based on plate length of 50,000, were performed for three °ow conditions using a
time-accurate hybrid Navier-Stokes solver. Time-averaged steady blowing of angled
jets, subjected to a zero pressure gradient, yielded excellent agreement with the PIV
data in terms of vortex formation and strength. Observed °ow features include pri-
mary and secondary vortices, where the primary vortex eventually dominates the
downstream region. A shell wall structure, created by smaller vortical structures sur-
rounding the developing vortices, was also observed. A pulsed jet in a zero pressure
gradient was then initialized from a no-control case. A qualitative comparison be-
tween averaged experimental and instantaneous numerical results was performed with
good agreement in terms of the convected size and distance of the wake. Analysis
of the instantaneous numerical °ow ¯eld agreed well with various °ow visualization
experiments describing the formation of \kidney" vortices. Various indicators point
to the production of a primary vortex by the reduced mass °ow of the pulsed jet.
Finally, an adverse pressure gradient was applied, inducing a laminar separation zone
on the plate. A pulsed angled jet induced strong spanwise vortices in the separated
shear layer which appear to weaken the separation zone and allow the bulk jet °uid
to °ush the remaining low-momentum °uid out of the domain. It is reasonable to
assume that reduced blowing ratios and duty cycles would produce similar shear layer
vortices and comparable loss reductions. In°uences of both turbulent transition and
dominant vortical structures were observed, though the spanwise shear layer vortices
appear to be critical to the laminar separation reduction scenarios observed in this
study. 德国LaVision PIV/PLIF粒子成像测速场仪 Imager pro X PIV相机 用于粒子成像测速(PIV)的荧光示踪粒子
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