scholarly journals Passive flow control study in a convoluted intake using Stereo Particle Image Velocimetry

2016 ◽  
Author(s):  
Geoffrey Tanguy ◽  
Pavlos Zachos ◽  
David G. MacManus ◽  
Daniel Gil-Prieto ◽  
Eric Garnier
Keyword(s):  
Particle Image Velocimetry ◽  
Flow Control ◽  
Particle Image ◽  
Passive Flow Control ◽  
Passive Flow ◽  
Image Velocimetry ◽  
Stereo Particle Image Velocimetry ◽  
Control Study

scholarly journals Passive Flow Control Study in an S-Duct Using Stereo Particle Image Velocimetry

AIAA Journal ◽  
2017 ◽  
Vol 55 (6) ◽  
pp. 1862-1877 ◽  
Author(s):  
Geoffrey Tanguy ◽  
David G. MacManus ◽  
Pavlos Zachos ◽  
Daniel Gil-Prieto ◽  
Eric Garnier
Keyword(s):  
Particle Image Velocimetry ◽  
Flow Control ◽  
Particle Image ◽  
Passive Flow Control ◽  
Passive Flow ◽  
Image Velocimetry ◽  
Stereo Particle Image Velocimetry ◽  
Control Study

Analysis of Passive Wake Mixing Techniques Using Time Resolved Digital Particle Image Velocimetry

2008 ◽  
Author(s):  
Christopher Weiland ◽  
Christopher Michie ◽  
Pavlos Vlachos
Keyword(s):  
Particle Image Velocimetry ◽  
Flow Control ◽  
Particle Image ◽  
Digital Particle Image Velocimetry ◽  
Control Technique ◽  
Trailing Edge ◽  
Time Resolved ◽  
Mixing Properties ◽  
Passive Flow Control ◽  
Image Velocimetry

Wake mixing is a common flow control technique that can be used in a multitude of applications to disrupt undesired flow structures. A Time Resolved Digital Particle Image Velocimetry (TRDPIV) experiment was performed to analyze the wake mixing properties of flow control approaches in the wake of a flat plate. Triangular winglet-type vortex generators, two lobed trailing edge geometries, and trailing edge blowing are examined and quantitative comparisons of their passive wake mixing properties are compared. The TRDPIV fields were analyzed using the Proper Orthogonal Decomposition as a metric for deducing wake coherency. Results indicate that the airfoil geometry plays a significant role in decreasing wake coherency. Additionally, the eigenmodes of the lobed geometries revealed the greatest differences in the dynamics of the flow between the low and high Reynolds number flows. This suggests these geometries are sensitive to the character of the boundary layer incident on the passive flow control devices.

Flow Structures behind Cylinders of Different Diameters Arranged Side-by-Side at Small Gap Ratios

2014 ◽  
Vol 348 ◽  
pp. 171-178
Author(s):  
Cheng Hsiung Kuo ◽  
Sen Yun Tseng ◽  
Sun Wen Hsu
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Recirculation Region ◽  
Flow Structures ◽  
Passive Flow Control ◽  
Passive Flow ◽  
Gap Ratio ◽  
Image Velocimetry ◽  
Large Cylinder ◽  
Different Diameters

The flow structures and their interactions behind side-by-side cylinders of unequal diameters at small gap ratios are studied by dye-flow visualization and particle image velocimetry at Reynolds number 1000. The whole-field mean and fluctuating velocity distributions and evolutions in the wakes are studied by the particle image velocimetry. As the gap ratio decreases, the mutual interaction of the wakes behind side-by-side cylinders pushes the recirculation region behind the large cylinder farther downstream at the expense of deterioration of the wake behind small cylinder. This change is important and may be relevant to the applications of passive flow control strategy.

Experimental study on the wake fields of a Panamax Bulker based on stereo particle image velocimetry

2018 ◽  
Vol 165 ◽  
pp. 91-106 ◽  
Author(s):  
Chun-yu Guo ◽  
Tie-cheng Wu ◽  
Wan-zhen Luo ◽  
Xin Chang ◽  
Jie Gong ◽  
...  
Keyword(s):  
Experimental Study ◽  
Particle Image Velocimetry ◽  
Particle Image ◽  
Image Velocimetry ◽  
Stereo Particle Image Velocimetry ◽  
Wake Fields

Investigation of Film Cooling Using Time-Resolved Stereo Particle Image Velocimetry

2020 ◽  
Author(s):  
Katharina Stichling ◽  
Maximilian Elfner ◽  
Hans-Jörg Bauer
Keyword(s):  
Particle Image Velocimetry ◽  
Film Cooling ◽  
Particle Image ◽  
Density Ratio ◽  
Test Rig ◽  
Time Resolved ◽  
Hot Gas ◽  
Image Velocimetry ◽  
Stereo Particle Image Velocimetry ◽  
Cooling Air

Abstract In the present study an existing test rig at the Institute of Thermal Turbomachinery (ITS), Karlsruhe Institute of Technology (KIT) designed for generic film cooling studies is adopted to accommodate time resolved stereoscopic particle image velocimetry measurements. Through a similarity analysis the test rig geometry is scaled by a factor of about 20. Operating conditions of hot gas and cooling air inlet and exit can be imposed that are compliant with realistic engine conditions including density ratio. The cooling air is supplied by a parallel-to-hot gas coolant flow-configuration with a coolant Reynolds number of 30,000. Time-resolved and time-averaged stereo particle image velocimetry data for a film cooling flow at high density ratio and a range of blowing ratios is presented in this study. The investigated film cooling hole constitutes a 10°-10°-10° laidback fan-shaped hole with a wide spacing of P/D = 8 to insure the absence of jet interaction. The inclination angle amounts to 35°. The time-resolved data indicates transient behaviour of the film cooling jet.

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