The flow acoustics channel is used for acoustic investigations and for assessing sound-absorbing structures. It is very flexible in terms of the shape and size of the objects under investigation and is also accessible for optical measurement techniques.
The Duct acoustic test rig (DUCT) is an extremely modular and versatile flow channel designed for acoustic measurements. At the test bench, we examine special silencer structures known as liners. These are used in aircraft engines at the inlet and in the bypass duct, among other locations. As the air flows over the sound-absorbing surface, the sound waves are dampened by resonance effects or other absorbers.
The focus here is on providing validation data that can be compared with models and numerical simulations. Loudspeakers at both ends of the channel allow sound propagation to be investigated with and against the main flow. If required, more than 100 microphones can be installed in the channel. Optical access and probe-based measurement techniques also allow for detailed investigations directly on the liners' surfaces, providing a better understanding of the physical processes and enabling the optimisation of prediction and calculation methods.
DUCT test bench at the Institute of Propulsion Technology
The DUCT flow acoustics channel is an extremely modular and versatile flow channel for acoustic measurements. At the test bench, we examine special silencer structures, known as liners, for example.
