Motivation and objectives
The correct modeling of turbulence is of central importance for aerodynamic design, cooling, gap management, and the service life and operational safety of compressors. In particular, the turbulent length scale in the inflow influences mixing and friction losses, boundary layer development, and possible separations, thereby determining efficiency, pressure rise, and stall and surge limits. Since these relationships are often only represented to a limited extent in existing industrial design tools, there is a clear need to investigate the underlying mechanisms in more detail and improve the physical description of turbulence for future design and evaluation methods.
The aim of the project is to systematically record the turbulence distribution in compressors and provide data for the further development of RANS turbulence and transition models. To this end, stereo PIV measurements were performed on a compressor cascade and the identical boundary conditions for large eddy simulations with TRACE were used, resulting in good agreement between the experiment and LES. The results illustrate the influence of the turbulent length scale in the inflow on the flow through the grid and form a basis for improved design methods in turbomachinery aerodynamics.
Responsible institute
The project is managed by the Institute for Turbomachinery and Fluid Dynamics.
Partner institution
The project is supported by the Turbo Working Group of the German Aerospace Center (DLR).
