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In order to examine the pressure distribution at bodies under incident flow, simple models such as semi-spherical shells, streamlined bodies or cylinders are used in fundamental experiments. Incident flow of 'blunt' models may lead to flow separation.
Used in conjunction with HM 240, the HM 240.04 accessory makes it possible to record the pressure distribution around a cylinder under transverse incident flow. The cylinder is attached inside the intake pipe of HM 240. The cylinder is fitted with a radial hole for pressure measurement and can be rotated around its axis. This means the pressure on the cylinder can be measured depending on the angle adjustment. The angle adjustment is detected electronically. The measured values are analysed using the HM 240 software.
In addition, a total pressure sensor (HM 240.03) that can be moved transverse to the direction of flow makes it possible to record the velocity profile downstream of the cylinder and thus to measure the wake.
HM 240.04 is part of a series that allows experiments on the principles of incompressible air flow. The software for data acquisition and visualisation makes the experiments especially clear and enables fast execution of experiments with reliable results.
The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.
Learning Objectives / Experiments
in conjunction with HM 240
- measurement of the pressure distribution around a cylinder subject to transverse incident flow
in conjunction with total pressure sensor HM 240.03
- measurement of the total pressure in the wake of a cylinder
- determine drag coefficient from the pressure distribution in the wake of a cylinder
- demonstrate wake depression