Every body immersed in a flow is subject (besides hydrostatic lift) to a flow-induced force, which depends mainly on the velocity of flow, the size of the body and the shape of the body. The shape of the body is represented by the dimensionless number, the drag coefficient. The goal of scientific study and
practical application (e.g. in vehicle construction) is to design the perfect body shape in order to keep drag low. The drag coefficient for arbitrarily shaped bodies can only be determined reliably by experimentation.
The experimental unit allows drag to be measured in various models so as to determine the respective drag coefficients. In the measuring section, a model (plate, cylinder and aerofoil model) is used as a drag body. The forces occurring in the air flow are measured with a beam scale with movable weight.
When conducting the experiment with a cylinder, a Pitot tube can be used to record a pressure distribution of the surrounding flow. Also, the drag can be measured indirectly via the pulse rate. The Pitot tube, movable obliquely to the
direction of flow, allows pressures to be recorded so as to determine the velocity profile downstream of the cylinder and thus to gauge the so-called wake depression. The experimental unit is attached to the FM-1849-56 apparatus (sold separately), simply and precisely with quick release fasteners.
Experiments
- Measure drag forces on models immersed in a flow
- Determining drag coefficients
- Application of the pulse rate
- Record pressure distribution on the cylinder immersed in a flow
- Measure the wake depression behind the cylinder immersed in a flow
Specification
- Determining drag forces on models immersed in a flow
- Recording the pressure distribution on models immersed in a flow
- Recording the velocity profile for measuring the wake depression behind the cylinder immersed in a flow
- Accessories for the aerodynamics FM-1849-56 (sold separately)
- Models: plate, cylinder and aerofoil model as drag body
- Cylinder with additional pressure measuring point
- Pitot tube with horizontal adjustment for measuring the total pressures
