J4 ›› 2012, Vol. 9 ›› Issue (1): 91-98.doi: 10.1016/S1672-6529(11)60101-7
Numerical Simulation of the Effect of Bionic Serrated Structures on the Aerodynamic Noise of a Circular Cylinder
Lei Shi1, Chengchun Zhang1, Jing Wang 1,2, Luquan Ren1
- 1. Key Laboratory of Engineering Bionics (Ministry of Education, China), Jilin University, Changchun 130022, P. R. China
2. Faculty of Agriculture, Jilin University, Changchun, 130062, P. R. China
Numerical Simulation of the Effect of Bionic Serrated Structures on the Aerodynamic Noise of a Circular Cylinder
Lei Shi1, Chengchun Zhang1, Jing Wang 1,2, Luquan Ren1
- 1. Key Laboratory of Engineering Bionics (Ministry of Education, China), Jilin University, Changchun 130022, P. R. China
2. Faculty of Agriculture, Jilin University, Changchun, 130062, P. R. China
摘要：
Flow control can effectively reduce the aerodynamic noise radiated from a circular cylinder. As one of the flow control methods, a bionic method, inspired by the serrations at the leading edge of owls’ wing, was proposed in this paper. The effects of bionic serrated structures arranged on the upper and lower sides of a cylinder on the aerodynamic and aeroacoustic performance of the cylinder were numerically investigated. At a free stream speed of 24.5 m•s−1, corresponding to Reynolds number of 1.58×104, the simulation results indicate that the bionic serrated structures can decrease the frequency of the vortex shedding and control the fluctuating aerodynamic force acting on the cylinder, thus reduce the aerodynamic noise. A qualitative view of the vorticity in the wake of the cylinder suggest that the serrated structures reduce aerodynamic sound by suppressing the unsteady motion of vortices.