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Products  |  Fluid Mechanics  |  Flow around Bodies  |  HM 170
HM 170 Open Educational Wind Tunnel Show data sheet (pdf file) Print page
Technical Description

  A wind tunnel is the classic experiment system for aerodynamic flow experiments. The model being studied remains at rest while the flow medium is set in motion, and thus the desired flow around the model is generated.
  HM 170 is an "Eiffel" type open wind tunnel used to demonstrate and measure the aerodynamic properties of various models. For this purpose, air is drawn in from the environment and accelerated. The air flows around a model, such as an aerofoil, in a measuring section. The air is then decelerated in a diffuser and pumped back into the open by a fan.
  The carefully designed nozzle contour and a flow straightener ensure a uniform velocity distribution with little turbulence in the closed measuring section. The flow cross section of the measuring section is square. The built-in axial fan with guide vane and a variable-speed drive is characterised by an energy-efficient operation at high efficiency. Air velocities of up to 28m/s can be reached in this open wind tunnel. The trainer is equipped with an electronic two-component force sensor. Lift and drag are detected and displayed digitally. The air velocity in the measuring section is displayed on the inclined tube manometer. The HM 170.50 16-Tube Manometer is recommended for measuring the pressure curves in drag bodies.
  By using the HM 170.60 System for Data Acquisition, the measured

values for pressure, displacement/angle, velocity and force can be transferred to a PC where they can be analysed with the software.

  Extensive accessories allow a variety of experiments, for example lift measurements, pressure distributions, boundary layer analysis or visualisation of streamlines.
  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.


Learning Objectives / Experiments

Experiments with accessories
- determine drag and lift coefficients for different

- pressure distribution when flowing around drag

- boundary layer analysis
- investigation of flutter
- wake measurement

In conjunction with the HM 170.52 Fog Generator
- visualisation of streamlines


* Open wind tunnel for a variety of aerodynamic

* Homogeneous flow through the flow straightener

  and special nozzle contour1
* Transparent measuring section

Available accessories
HM 170.01 -- Drag Body Sphere
HM 170.02 -- Drag Body Hemisphere
HM 170.03 -- Drag Body Circular Disc
HM 170.04 -- Drag Body Circular Ring
HM 170.05 -- Drag Body Square Plate
HM 170.06 -- Drag Body Flag
HM 170.07 -- Drag Body Cylinder
HM 170.08 -- Drag Body Streamlined Shape
HM 170.09 -- Drag Body Aerofoil
HM 170.10 -- Drag Body Paraboloid
HM 170.11 -- Drag Body Concave Shape
HM 170.20 -- Aerofoil, Spring-Mounted
HM 170.21 -- Aerofoil with Slat and Slot Flap
HM 170.22 -- Pressure Distribution on an Aerofoil
HM 170.23 -- Pressure Distribution on a Cylinder
HM 170.24 -- Boundary Layer Analysis with Pitot Tube
HM 170.25 -- Model "Bernoulli"
HM 170.28 -- Wake Measurement
HM 170.31 -- Pitot Tube
HM 170.32 -- Pitot Tube, Small
HM 170.33 -- Pitotstatic Tube
HM 170.34 -- Tube for Static Pressure
HM 170.40 -- Three-Component Force Sensor
HM 170.50 -- 16-Tube Manometer, 600mm
HM 170.52 -- Fog Generator
HM 170.55 -- Electronic Pressure Measurement, 18x 0...500Pa
HM 170.60 -- System for Data Acquisition
HM 170.61 -- Electronic Displacement Management
Alternative products
HM 172 -- Supersonic Wind Tunnel with Schlieren Optics
HM 225 -- Aerodynamics Trainer
HM 170 Open Wind Tunnel

[1] experiments from the field of aerodynamics and fluid mechanics with an "Eiffel" type wind tunnel
[2] wide range of accessories available
[3] transparent, closed measuring section
[4] inlet contour, nozzle and diffuser made of GRP
[5] variable-speed fan motor for energy-efficient operation
[6] flow straightener reduces turbulence
[7] electronic two-component force sensor for measuring the flow forces
[8] inclined tube manometer for displaying the air velocity
[9] digital display of drag and lift
[10] display of measured values for pressure, displacement/angle, velocity and force using HM 170.60 System for Data Acquisition


Technical Data

Measuring section
- flow cross section WxH: 292x292mm
- length: 420mm
- wind velocity: 3,1...28m/s
Axial fan
- power consumption: 2,55kW  

Measuring ranges
- force: 2x -5...5N
- pressure: 0...5mbar


Dimensions and Weight
LxWxH: 2.860x860x1.700mm
Weight: approx. 250kg
Required for Operation
230V, 50/60Hz, 1 phase or 230V, 60Hz/CSA,  3 phases
Scope of Delivery
1 trainer
1 set of instructional material
Order Details
070.17000  HM 170  Open Wind Tunnel
Teaching STEM Laboratory - Educational Wind Tunnel with Drag Bodies