Passive Jet Approach to Control the Flow over a Circular Cylinder

Wang, Xiang-Jun1,2,3; Chen, Wen-Li1; Gao, Dong-Lai1,2; Yang, Wen-Han1,2; Li, Hui1,2

2020

10.1061/(ASCE)AS.1943-5525.0001124

JOURNAL OF AEROSPACE ENGINEERING   影响因子和分区

0893-1321

1943-5525

A numerical investigation was conducted on a passive jet flow control method for alleviating unsteady wake oscillation behind a circular cylinder. The study focused on the effects of two crucial parameters-the number of jet holes in a pipe and the radial thickness of a pipe-on the aerodynamic forces acting on a circular cylinder and alternating vortex shedding in the wake. Pressure coefficient distributions, aerodynamic coefficients, vorticity distributions, probability density functions of wake velocities, and production of turbulent kinetic energy were analyzed in detail. Both the fluctuating lift force and the mean drag force acting on the model decreased with an increase in the jet momentum coefficient. The optimal parameters were a 13-hole pipe and a 5% ratio of pipe radial thickness to the cylinder diameter. Under the optimal parameters, fluctuating lift was reduced by 99.57% with a mean drag reduction of 32.41% compared with a bare cylinder. The fluctuating wake of the circular cylinder was almost eliminated. The alternating vortex shedding was converted into two parallel shear layers, and the asymmetric vortex shedding mode was shifted into a symmetric wake mode. The probability density function of the fluctuating transverse velocity in the wake shrank without wide tails, because the production of turbulent kinetic energy in the wake was reduced by over one order of magnitude, which is the intrinsic nature of this passive method to effectively suppress the aerodynamic forces on a circular cylinder and wake oscillation.
© 2020 American Society of Civil Engineers.

Vortex shedding Passive control method Aerodynamic coefficients

EI ; SCI

英语

其他

National Basic Research Program of China (973 Program)[2016YFC0701107] ; National Natural Science Foundation of China[51978222] ; Fundamental Research Funds for the Central Universities[]

Engineering

Engineering, Aerospace ; Engineering, Civil

WOS:000521113100004

American Society of Civil Engineers (ASCE), 1801 Alexander Bell DriveGEO, Reston, Alabama VA 20191, United States

20201208322568

Circular cylinders ; Drag ; Kinetic energy ; Kinetics ; Lift ; Numerical methods ; Oscillating cylinders ; Oscillating flow ; Probability distributions ; Vortex flow ; Vortex shedding ; Wakes

Mechanical Devices:601.1 ; Fluid Flow, General:631.1 ; Aerodynamics, General:651.1 ; Numerical Methods:921.6 ; Probability Theory:922.1

ENGINEERING

EV Compendex

1.Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters, Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin; 150090, China
2.Key Laboratory of Structures Dynamic Behavior and Control of the Ministry, Harbin Institute of Technology, No. 73, Huanghe Rd., Harbin; 150090, China
3.Dept. of Mechanics and Aerospace Engineering, Southern Univ. of Science and Technology, No. 1088, Xueyuan Rd., Shenzhen; 518055, China

Wang, Xiang-Jun,Chen, Wen-Li,Gao, Dong-Lai,et al. Passive Jet Approach to Control the Flow over a Circular Cylinder[J]. JOURNAL OF AEROSPACE ENGINEERING,2020,33(3).

Wang, Xiang-Jun,Chen, Wen-Li,Gao, Dong-Lai,Yang, Wen-Han,&Li, Hui.(2020).Passive Jet Approach to Control the Flow over a Circular Cylinder.JOURNAL OF AEROSPACE ENGINEERING,33(3).

Wang, Xiang-Jun,et al."Passive Jet Approach to Control the Flow over a Circular Cylinder".JOURNAL OF AEROSPACE ENGINEERING 33.3(2020).