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Flow and pressure losses occur when a parallel flow exits into stationary surroundings. The velocity of the exiting flow decreases depending on the distance and diameter of the outlet area. The velocity decreases with increasing distance from the middle jet. The findings from the velocity profiles are used for example in the construction of nozzles and turbomachines.
The HM 225.07 experimental unit – used in the aerodynamics trainer HM 225 – allows the measurement of the velocity curve in the outlet jet. The total pressures are measured at defined distances from the outlet area in the vertical and horizontal direction by means of a movable Pitot tube.
Pressures read on the tube manometers in HM 225 can be used to determine the velocity. The graphical representation of the velocity profile indicates a decrease in velocity with increasing distance of the measurement from the middle jet and the outlet area. Vortex formation at boundary layers leads to the reduction in velocity due to the loss of energy.
The experimental unit is attached to the HM 225 trainer, simply and precisely with quick release fasteners.
The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.
Learning Objectives / Experiments
- recording the pressure curve at the outlet of a parallel flow into resting surroundings
- representation of velocity profiles