Unsteady flow separation on slender bodies at high angles of attack

1993 ◽  
Vol 30 (6) ◽  
pp. 689-695 ◽  
Author(s):  
L. E. Ericsson
Keyword(s):  
Unsteady Flow ◽  
Flow Separation ◽  
Slender Bodies ◽  
High Angles Of Attack

Investigation of the development of unsteady flow separation from a model swept wing

2009 ◽  
Vol 44 (5) ◽  
pp. 680-686 ◽  
Author(s):  
I. V. Kolin ◽  
V. G. Markov ◽  
V. L. Sukhanov ◽  
T. I. Trifonova ◽  
D. V. Shukhovtsov
Keyword(s):  
Unsteady Flow ◽  
Flow Separation ◽  
Swept Wing

SINGULAR AERODYNAMIC FEATURES OF LOW-SPEED HIGH-ANGLES-OF-ATTACK SLENDER BODIES

1988 ◽  
pp. 435-440
Author(s):  
K. Suzuki ◽  
M. Matsuzaka ◽  
T. Watanuki ◽  
N. Itoda ◽  
H. Kubota
Keyword(s):  
Low Speed ◽  
Slender Bodies ◽  
High Angles Of Attack

A comparison of different unsteady flow control techniques in a highly loaded compressor cascade

2018 ◽  
Vol 233 (6) ◽  
pp. 2051-2065 ◽  
Author(s):  
Hongxin Zhang ◽  
Shaowen Chen ◽  
Yun Gong ◽  
Songtao Wang
Keyword(s):  
Unsteady Flow ◽  
Flow Control ◽  
Flow Separation ◽  
Synthetic Jet ◽  
Control Technique ◽  
Compressor Cascade ◽  
Optimum Result ◽  
Control Techniques ◽  
Constant Suction ◽  
Highly Loaded

A numerical research is applied to investigate the effect of controlling the flow separation in a certain highly loaded compressor cascade using different unsteady flow control techniques. Firstly, unsteady pulsed suction as a new novel unsteady flow control technique was proposed and compared to steady constant suction in the control of flow separation. A more exciting effect of controlling the flow separation and enhancing the aerodynamic performance for unsteady pulsed suction was obtained compared to steady constant suction with the same time-averaged suction flow rate. Simultaneously, with the view to further exploring the potential of unsteady flow control technique, unsteady pulsed suction, unsteady pulsed blowing, and unsteady synthetic jet (three unsteady flow control techniques) are analyzed comparatively in detail by the related unsteady aerodynamic parameters such as excitation location, frequency, and amplitude. The results show that unsteady pulsed suction shows greater advantage than unsteady pulsed blowing and unsteady synthetic jet in controlling the flow separation. Unsteady pulsed suction and unsteady synthetic jet have a wider range of excitation location obtaining positive effects than unsteady pulsed blowing. The ranges of excitation frequency and excitation amplitude for unsteady pulsed suction gaining favorable effects are both much wider than that of unsteady pulsed blowing and unsteady synthetic jet. The optimum frequencies of unsteady pulsed suction, unsteady pulsed blowing, and unsteady synthetic jet are found to be different, but these optimum frequencies are all an integer multiple of the natural frequency of vortex shedding. The total pressure loss coefficient is reduced by 16.98%, 16.55%, and 17.38%, respectively, when excitation location, frequency, and amplitude are all their own optimal values for unsteady pulsed suction, unsteady pulsed blowing, and unsteady synthetic jet. The optimum result of unsteady synthetic jet only slightly outperforms that of unsteady pulsed suction and unsteady pulsed blowing. But unfortunately, there is no advantage from the standpoint of overall efficiency for the optimum result of unsteady synthetic jet because the slight improvement has to require a greater power consumption than the unsteady pulsed suction and unsteady pulsed blowing methods.

A Lagrangian criterion of unsteady flow separation for two-dimensional periodic flows

2018 ◽  
Vol 39 (7) ◽  
pp. 1007-1018 ◽  
Author(s):  
Shuaibin Han ◽  
Shuhai Zhang ◽  
Hanxin Zhang
Keyword(s):  
Unsteady Flow ◽  
Flow Separation ◽  
Two Dimensional ◽  
Periodic Flows

scholarly journals Interpretation of Four Unique Phenomena and the Mechanism in Unsteady Flow Separation Controls

Energies ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 587 ◽  
Author(s):  
Weiyu Lu ◽  
Guoping Huang ◽  
Jinchun Wang ◽  
Yuxuan Yang
Keyword(s):  
Numerical Simulation ◽  
Unsteady Flow ◽  
Flow Control ◽  
Flow Separation ◽  
Flow Instability ◽  
Control Flow ◽  
Separation Control ◽  
Pulsed Jet ◽  
Unsteady Separation ◽  
Flow Theories

Unsteady flow separation controls are effective in suppressing flow separations. However, the unique phenomena in unsteady separation control, including frequency-dependent, threshold, location-dependent, and lock-on effects, are not fully understood. Furthermore, the mechanism of the effectiveness that lies in unsteady flow controls remains unclear. Thus, this study aims to interpret further the unique phenomena and mechanism in unsteady flow separation controls. First, numerical simulation and some experimental results of a separated curved diffuser using pulsed jet flow control are discussed to show the four unique phenomena. Second, the bases of unsteady flow control, flow instability, and free shear flow theories are introduced to elucidate the unique phenomena and mechanism in unsteady flow separation controls. Subsequently, with the support of these theories, the unique phenomena of unsteady flow control are interpreted, and the mechanisms hidden in the phenomena are revealed.

Plasma Control of Flow Separation on Swept Wing at High Angles of Attack

2008 ◽  
Author(s):  
Anatoly Maslov ◽  
Andrey Sidorenko ◽  
Boris Zanin ◽  
Boris Postnikov ◽  
Alexey Budovsky ◽  
...  
Keyword(s):  
Flow Separation ◽  
Swept Wing ◽  
Control Of Flow ◽  
High Angles Of Attack ◽  
Plasma Control
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