Experimental Investigation of the Vortex Dynamics in Circular Jet Impinging on Rotating Disk

被引：2
|
作者：
El Hassan, Mouhammad [1 ]
Nobes, David S. [2 ]
机构：
[1] Prince Mohammad Bin Fahd Univ, Mech Engn Dept, Al Khobar 34754, Saudi Arabia
[2] Univ Alberta, Dept Mech Engn, Edmonton, AB T6G 2R3, Canada
来源：
FLUIDS | 2022年 / 7卷 / 07期
基金：
加拿大自然科学与工程研究理事会;
关键词：
impinging jet; rotating disk; vortex dynamics; PIV; FTLE; COHERENT STRUCTURES; HEAT-TRANSFER;
D O I：
10.3390/fluids7070223
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
A circular jet impinging perpendicularly onto a rotating disk is studied in order to understand the influence of centrifugal forces on the radial wall jet. Time-resolved Particle Image Velocimetry (TR-PIV) measurements are conducted in different jet regions in order to investigate the flow physics of the large-scale vortical structures and the boundary layer development on the impinging wall for both stationary and rotating impinging disks. The Reynolds number is Re-D = 2480, the orifice-to-plate distance H = 4D (D is the jet-orifice diameter) and the rotation rate is 200 RPM. It is found that the rotation of the impinging wall results in strong centrifugal effects, which affect different regions of the jet. Both radial velocity profiles and turbulence intensity distributions show different behavior when comparing the stationary and rotating cases. Finite Time Lyapunov Exponent (FTLE) analysis is implemented to describe the time-resolved behavior of the large-scale vortical structures and flow separation.
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页数：11
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