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Products | Fluid Mechanics and Hydrology | Fundamentals of Aerodynamics and Airflow | HM 170

HM 170

Educational Wind Tunnel

Technical Description

The educational wind tunnel HM 170 is a so-called "Eiffel type" of open subsonic wind tunnel. With this type of tunnel the air is taken from the atmosphere and returned to the atmosphere. A carefully designed nozzle shape guarantees the constant distribution of velocity within the closed measurement section. Velocities of around 100km/h are reached. A flow rectifier at the inlet ensures a low degree of turbulence. The wind tunnel consists of the following components: inlet hopper with flow rectifier, nozzle, measurement section, diffuser and fan. The nozzle, inlet hopper and the measurement section are mounted on a guide rail and can be moved in order to access the measurement section. An axial fan with guide wheel is used which is characterised by its low noise level and high efficiency. The fan is mounted on rubber elements to minimise vibration during operation. It is driven by a speed-controlled motor with frequency converter. The fan is connected permanently with the diffuser. An electronic 2-component force transducer permits the measurement of resistance and buoyant forces at various objects. The measured values are displayed on a measuring amplifier. It is also possible to process the data via PC-data acquisition (available as an accessory). A slanted tube manometer is used to display the current air velocity at the inlet into the measurement section.

Learning Objectives / Experiments

The extensive range of accessories permit a number of experiments:
Methods of measuring velocity and pressure
Determination of drag coefficients of various objects
Measurement of lift and resistance on various wing sections
Examination of aerodynamic lifting aids such as slats or flaps
Examination of pressure distribution on flushed objects
Examination of boundary layers

Features

Open wind tunnel for experiments in aerodynamics and fluid mechanics
Homogeneous flow through flow rectifier and specially shaped nozzle
measurement section visible on all sides
Smooth inner surface

Available accessories

HM 170.01 -- Drag Model "Sphere"
HM 170.02 -- Drag Model "Hemisphere"
HM 170.03 -- Drag Model "Circular Disc"
HM 170.04 -- Drag Model "Circular Ring"
HM 170.05 -- Drag Model "Square Plate"
HM 170.06 -- Drag Model "Vane"
HM 170.07 -- Drag Model "Cylinder"
HM 170.08 -- Drag Model "Streamlined Shape"
HM 170.09 -- Drag Model "Aero Foil"
HM 170.20 -- Flutter Wing Model
HM 170.21 -- Aero Foil with Flap and Slot
HM 170.22 -- Pressure Wing
HM 170.23 -- Pressure Cylinder
HM 170.24 -- Boundary Layer Plate with Probe
HM 170.25 -- Bernoulli's Equation
HM 170.31 -- Pitot-Probe
HM 170.32 -- Small Pitot-Probe
HM 170.33 -- Prandtl-Probe
HM 170.34 -- Static Pressure Probe
HM 170.50 -- Multi-Tube Manometer Panel / 600 mm
HM 170.52 -- Fog Generator
HM 170.60 -- PC Data Acquisition System

Alternative products

HM 172 -- Supersonic Wind Tunnel
HM 225 -- Airflow Bench

Specification

[1] Open wind tunnel on mobile carriage
[2] Experimental set-up lxwxh 2890x860x1670mm, 250kg
[3] 450mm Plexiglas measurement section, cross-section of flow 292x292mm
[4] Inlet hopper, nozzle and diffuser made of FRP
[5] Speed-controlled fan motor with frequency converter
[6] Electron. 2-components force transducer with measuring amplifier and digital display
[7] Flow rectifier

Technical Data

measurement section
Cross-section wxh: 292x292mm
Length: 450mm
Max. wind velocity: 28m/s
Fan
Pressure difference: 500Pa
Max. volumetric flow: 9000m³/h
Motor output: 2.25kW
Max. rotational speed: 2850rpm
2-component force transducer
Measuring range: 0...5N and 0...10N
Slanted tube manometer
0...500Pa

Dimensions and Weight

lxwxh : 2890 x 860 x 1670 mm
Weight : approx. 250 kg

Connections

230V, ~50Hz

Scope of Delivery

1 wind tunnel, complete with fan and motor, 1 force transducer, 1 measuring amplifier, 1 slanted tube manometer, 1 instruction manual

Order Details

070.1700 HM 170 Educational Wind Tunnel