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Institute of Turbomachinery and Fluid Dynamics
Logo Leibniz Universität Hannover
Institute of Turbomachinery and Fluid Dynamics
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Working Group Aeroacoustics and Aeroelasticity

Description

Long-term forecasts predict continuous growth of both global air traffic and energy consumption, logically leading to a further increase of greenhouse gas and noise emissions. At the same time legislative regulations issued around the world aim to limit and even reduce emission levels. The turbomachine will play an indispensable role in the future growth in the energy and transport sectors, given the lack of other suitable technologies. Therefore, new aircraft and propulsion designs are required and advanced designs for stationary turbomachines are necessary, spurring further development in this field.

Hence the research group Aeroacoustics and Aeroelasticity concerns itself with the current issues of turbomachinery aeroacoustics and aeroelasticity, with its research being funded by both public and industry partners.

In aeroacoustics, sound propagation and generation mechanisms in turbines and compressors are experimentally investigated and numerically simulated. In this context, new aeroacoustic measurement methods are developed. At the institute a broad range of experimental facilities are available, including an aeroacoustic wind tunnel for turbomachinery applications. Both commercial and research codes are used for simulations in computational fluid dynamics (CFD) and computational aeroacoustics (CAA). In addition to sound transport mechanisms in turbomachines, acoustic resonance phenomena in compressors, and the sound generating mechanisms of wind turbines are being investigated in this group.

The aeroelasticity research focuses on both numerical simulations and experimental studies of axial turbines and compressors. Currently the major phenomena blade flutter and forced response are investigated with respect to their sensitivity to geometric variances introduced during maintenance, repair, and overhaul (MRO). Additionally the experimental quantification of aerodynamic damping—the key parameter for flutter vibration—is an objective of the group's research. In this field a close collaboration with the turbine group of the Institute of Dynamics and Vibration Research exists.

Completed Projects

  • Analytic Investigation of Acoustic Resonance in a Multistage Axial Compressor
  • BliDes – Experimental Investigation of Compressor Flutter
  • Citizen Aircraft – Investigation of Sound Propagation in Low Pressure Turbines
  • Development and Experimental Validation of an Acoustic Excitation Method for Rotating Blade Cascades
  • Experimental Investigation of Acoustic Resonance in a 4-Stage Axial Compressor

Current Projects

  • Acoustic Excitation of Blade Vibrations for the Investigation of Aerodynamic Damping
  • CRC 871-C4 – Aeroelastics of Turbine Blades
  • CRC 871-C6 – Aeroelastics of Compressor Blisks
  • Experimental Study to the Transmission and Reflection of Modal Sound Fields through Low Pressure Turbines
  • Numerical Analysis of Sensitivities of Interior Core Engine Noise Evolution and Reduction
  • Smart Blades – Flow Simulation and Noise Prediction of Wind Turbine Blades with Flaps
  • Sound transmission and reflection in turbomachine blade rows
  • Grid-Induced Vibrations of Turbine Shafts
  • Mistuning with Aerodynamic Coupling
  • Aeroelastics of Low Pressure Compressors of future UHBR-Engines

Contacts

Group Leader

Stephanie Lehnhoff, M.Eng.

Assistant Group Leader

M. Sc. Christoph Jätz