TY - JOUR

T1 - Galloping of small aspect ratio square cylinder

AU - Ryabinin, A.N.

AU - Lyusin, V.D.

PY - 2015

Y1 - 2015

N2 - A mathematical model of galloping is considered in a quasi-steady approximation. Normal force aerodynamic coefficients Cy of square cylinder are measured in the subsonic wind tunnel at different angles of attack α. The cylinder aspect ratio is 10. The same cylinder is tested with end plates as well. A new function for the approximation of the aerodynamic coefficients dependence on the angle of attack is used. Krylov-Bogoliubov method is applied. Mathematical model allows predicting the critical air velocity at which oscillations occur. The amplitude of the oscillations can be calculated as a function of flow velocity. It appeared that the end plates significantly change the aerodynamic coefficients at low angles of attack. The critical air velocity reduces. The inflection point appears on the dependence Cy (α). Results of mathematical simulation are verified in the wind tunnel experiments. Square cylinder is suspended on two springs across the flow generated in the wind tunnel working section. The tension of

AB - A mathematical model of galloping is considered in a quasi-steady approximation. Normal force aerodynamic coefficients Cy of square cylinder are measured in the subsonic wind tunnel at different angles of attack α. The cylinder aspect ratio is 10. The same cylinder is tested with end plates as well. A new function for the approximation of the aerodynamic coefficients dependence on the angle of attack is used. Krylov-Bogoliubov method is applied. Mathematical model allows predicting the critical air velocity at which oscillations occur. The amplitude of the oscillations can be calculated as a function of flow velocity. It appeared that the end plates significantly change the aerodynamic coefficients at low angles of attack. The critical air velocity reduces. The inflection point appears on the dependence Cy (α). Results of mathematical simulation are verified in the wind tunnel experiments. Square cylinder is suspended on two springs across the flow generated in the wind tunnel working section. The tension of

KW - galloping

KW - aspect ratio

KW - wind tunnel

KW - mathematical model

M3 - Article

VL - 10

SP - 134

EP - 138

JO - ARPN Journal of Engineering and Applied Sciences

JF - ARPN Journal of Engineering and Applied Sciences

SN - 2409-5656

IS - 1

ER -