The study of passive flow control device performance at low inlet subcooling

1999 ◽  
Author(s):  
S. G. Liou ◽  
I. Y. Chen ◽  
S. K. Chang
Keyword(s):  
Flow Control ◽  
Control Device ◽  
Device Performance ◽  
Passive Flow Control ◽  
Passive Flow ◽  
Flow Control Device

Investigation of a Passive Flow Control Device in an S-Duct Inlet of a Propulsion System With High Subsonic Flow

2018 ◽  
Author(s):  
Asad Asghar ◽  
Satpreet Sidhu ◽  
William D. E. Allan ◽  
Grant Ingram ◽  
Tom M. Hickling ◽  
...  
Keyword(s):  
Flow Control ◽  
Complex Geometry ◽  
Control Device ◽  
Pressure Recovery ◽  
Passive Flow Control ◽  
Passive Flow ◽  
Flow Control Device ◽  
Inner Radius ◽  
Selection Of ◽  
Numerical Approaches

S-Ducts have wide application on air vehicles with embedded engines. The complex geometry is known to lead to separation downstream of curved profiles. This paper reports the influences on that flow of passive flow control geometries. In these experiments, stream-wise tubercles were applied in an effort to improve the internal performance of S-duct diffusers, parameters including pressure recovery, distortion and swirl. The test articles were tested with the high subsonic (Ma = 0.8) flow and were manufactured using 3D printing. Stream-wise static pressure and exit-plane total pressure were measured in a test rig using surface pressure taps and a 5-probe rotating rake, respectively; the baseline and variant S-ducts were simulated through computational fluid dynamics. The experiments showed that some subtle improvements to the S-Duct distortion could be achieved through careful selection of tubercle geometry. Generally, the recovered flow downstream of the inner radius of the second bend of the S-duct deteriorated, but overall pressure recovery improved. The simulations were useful in characterizing swirl, whereas experiments were not so equipped. Adjustments to the numerical approaches resulted in reasonable agreement with the experiments.

scholarly journals Microfiber Coating for Flow Control over a Blunt Surface

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 664 ◽  
Author(s):  
Mitsugu Hasegawa ◽  
Hirotaka Sakaue
Keyword(s):  
Drag Reduction ◽  
Flow Control ◽  
Bluff Body ◽  
Relative Length ◽  
Control Device ◽  
Cylinder Surface ◽  
Passive Flow Control ◽  
Passive Flow ◽  
Maximum Drag Reduction ◽  
The Impact

A microfiber coating having a hair-like structure is investigated as a passive flow control device of a bluff body. The effect of microfiber length is experimentally studied to understand the impact of the coating on drag on a cylinder. A series of microfiber coatings with different lengths are fabricated using flocking technology and applied to various locations over the cylinder surface under the constant Reynolds number of 6.1 × 104 based on the diameter of the cylinder. It is found that the length and the location both play important roles in the drag reduction. Two types of drag reduction can be seen: (1) when the relative length of the microfiber, k/D, is less than 1.8%, and the coating is applied before flow separates over the cylinder; and (2) k/D is over 3.3%, and the coating is applied after the flow separation location on the cylinder. The maximum drag reduction for the former type is 59% compared to that from the cylinder without the microfiber coating. For the latter type, the maximum drag reduction is 27%.

Characterization of Flow Control Device Performance with Distributed Fiber-Optic Sensors

2019 ◽  
Author(s):  
Ben Banack ◽  
Lyle H. Burke ◽  
Daniel Booy ◽  
Emeka Chineme ◽  
Marty Lastiwka ◽  
...  
Keyword(s):  
Flow Control ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Control Device ◽  
Device Performance ◽  
Flow Control Device

Sound suppressing gas flow control device

1980 ◽  
Vol 67 (4) ◽  
pp. 1413-1413
Author(s):  
George J. Kay ◽  
Alan Keskimen
Keyword(s):  
Flow Control ◽  
Gas Flow ◽  
Control Device ◽  
Flow Control Device

Computational design and experimental testing of a flexible bi-stable airfoil for passive flow control

2021 ◽  
Author(s):  
Anurag Bhattacharyya ◽  
Mark Bashkawi ◽  
Se Yeon Kim ◽  
Wanzheng Zheng ◽  
Theresa Saxton-Fox ◽  
...  
Keyword(s):  
Flow Control ◽  
Experimental Testing ◽  
Computational Design ◽  
Passive Flow Control ◽  
Passive Flow
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