Distribution of sound sources for jet-flap interference
The branch investigates the noise generation at aircraft and vehicles and develops noise reduction technologies. For this purpose, on the one hand numerical simulation codes are being developed and employed, on the other hand experiments are conducted in aeroacoustic wind tunnels as well as in flyover tests.
Aeroacoustic Windtunnel Braunschweig, cross section 1.2x0.8 m2, Umax=65 m/s, anechoic chamber, external pressure supply for jets and flow control, source localization with elliptic mirror and stationary or directional microphone array, free field microphones, wind tunnel balance, hot wire anemometry and PIV flow field measurement.
Wide area wireless ground microphone system
System of 30 remote controlled noise measurement stations equipped with max. 2 microphones each for the measurement of the directional sound radiation of aircraft as well as the direct measurement of noise contours.
CAA Code for the solution of unsteady perturbations about RANS flow field on block structured grids (high resolution Finite Differences) for the computation of sound generation and sound propagation in flows up to near farfield.
CAA Code for the solution of unsteady inviscid perturbations about RANS flow field on unstructured grids (discontinuous Galerkin) for the computation of sound generation and sound propagation in flows up to near farfield.
Advanced RANS data based stochastic 4D turbulence reconstruction for highly efficient simulation of turbulence related sources of sound and turbulent scattering.
Ffowcs-Williams & Hawkings (incl. extensions) solver for the computation of the sound radiation in uniform flow on the basis of unsteady CFD/CAA data on aerodynamic surfaces or source- enclosing closed fluid surfaces: usually for farfield prediction.
Ray-Tracer with diffraction correction due to Maggi/Rubinowitz for the computation of acoustic installation effects at complete aircraft geometries.
Fast Multipole boundary element method for the highly efficient solution of the wave equation on unstructured (triangular elements) surface grids.
Team lead noise reduction technologies:
Dr.-Ing. Michaela Herr
Team lead aeroacoustic testing:
Dipl.-Ing. Michael Pott-Pollenske
Team lead simulation technologies:
Dr.-Ing. Roland Ewert