Design of a subsonic wind tunnel and its construction

The study of effects of air oh a flow submerged is important from engineering point of view. Most problems of experimental aerodinamics are connected to the study of motion of the fluid relative to a stationary body. A drag: force acts to the body because of viscous effects. If the velocity of flow increases, the drag force will increase proportional to square of the velocity and the drag power will increase proportional to the third power of the velocity. On the other hand, the shape of the body affects aerodynamical forces on the body, Therefore, we need a wind tunnel to make research on the aerodynamic problems. For this purpose, a subsonic wind tunnel designed and constructed. The measurements of the velocity of air in the test section of the tunnel at different cross- sections showed that the Velocity distribution in the test section was uniform. That means the desigg and const" ruction of this closed circuit subsonic wind tunnel is suitable for experimental studies.