DefinePK

Abstract

The paper describes the experimental study of shielding effects of the disk placed coaxially upstream of a cylinder. It not only reduces the drag of the cylinder. The disk changes the dynamic characteristics of the cylinder. Without a disk, an elastically fixed cylinder in the airflow performs rotational oscillations with constant amplitude. A disk of small diameter, located near the cylinder, reduces the amplitude of rotational oscillation. Increasing the distance between the disk and the cylinder causes the damped rotational oscillations. The influence of the aerodynamic force on the damping of the oscillations depends on the disk diameter and the gap between disk and cylinder. A mathematical model is proposed for describing the rotational steady and damped oscillation of a cylinder with a disk.