The low speed wind tunnel MUB is a closed return atmospheric tunnel with three different test sections. With the 1300 x 1300 mm² closed test section a maximum speed of 60 m/s is achieved. Instrumentation includes two different balances, particle image velocimetry, infrared thermography and a PSI scanning system.

Working Principle
The wind tunnel MUB is a multipurpose 'Göttingen type' wind tunnel with three exchangeable, different test sections for research on airfoils, aircraft components and ground vehicles. Two of the test sections are closed and one is an open test section. A new heat exchanger in the settling chamber allows to stabilise the temperature of the flow, hence the experimental environment is improved significantly. The closed test section allows flexible optical access as well as the usage of conventional measurement techniques. The low speed wind tunnel allows to conduct experiments in a wide range of applications.

Performance Parameters
The MUB is designed to achieve a maximum speed of 60 m/s in the large closed test section and the open test section. It is driven by a DC voltage motor with 300 kW electrical power supply. In the small test section velocities up to 130 m/s are possible. The maximum Reynolds number for this configuration is 690000. The heat exchanger keeps the flow temperature maximally 10°C above the ambient temperature.

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Geometric data
Test section 1 (1300 x 1300 x 3000 mm³)
Test section 2 (800 x 800 x 3000 mm³)

Flow data
Max. Velocity U = 60 m/s
Max. Velocity U = 130 m/s
Max. Re = 690000
Tu = 0.20% at 53 m/s and 0-25 kHz

Supply systems
Motor el. power P = 300 kW
thermal power of heat exchanger system P = 300 kW


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Test Section
The two closed test sections have a cross section of 1300 x 1300 mm² and 800 x 800 mm², respectively and a length of 3000 mm. Using the 1300 x 1300 mm² test section the contraction ratio is 4.91, whereas the contraction is 12.9 for the 800 x 800 mm² test section. Both closed test sections allow flexible optical access by easily removable and changeable walls. The wind tunnel can be used with two model support systems. One is the basic alpha-beta support unit for the 1300x1300 mm² test section. Two-dimensional models are mounted between turntables in both closed test sections. For automotive test a fixed ground plane for the open test section is under development. The turbulence level in the large test section is about 0.20% at 53 m/s.

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To secure a reliable experimental simulation environment a new data acquisition system has been established. The system determines the flow conditions with an accuracy of 0.12%. The wind tunnel is equipped with a PSI 8400 DTC pressure measuring system. The wind tunnel instrumentation is compatible with the system of the DNW-NWB system. A three-component particle image velocimetry (PIV) is available for non-intrusive measure- ments. A 340 Hz Indigo infrared camera system with 320 x 256 resolution is available for temperature measurements. Research is underway to develop infrared heat transfer measurements. Two six-component balances are available for the wind tunnel. The internal balance W611 is used with the alpha-beta support. The second balance is the external balance KME 4 and is mainly intended for automotive tests. This balance was designed and manufactured by DNW. The wind tunnel instrumentation includes a probe traverse for conventional probe measurements. Also flow visualisations applying oil painting method and laser light sheet techniques are possible.

  last changed 02.03.2015
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