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HM 170 Open Wind Tunnel
Education / GUNT Hamburg / Fluid Mechanics and Hydrology / Flow around Bodies /

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


[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 0...10N
- 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
070.1700  HM 170  Open Wind Tunnel