The junior research group Multiphysics of Turbulent Flows is concerned with the influence of turbulence and transitional boundary layers on the aerodynamics of turbo machines. The work is focused on two major points: The investigation of the physics of turbulence using scale-resolving numerical methods as well as experimental data from TFD test rigs, and applying this knowledge to the development of physical RANS models for turbomachinery design. The current focus is set on active and passive methods to influence the transitional boundary layers of low-pressure turbines (LPT), the influence of isotropic and anisotropic surface roughness on turbulent boundary layers as well as the stabilizing influence of periodic wakes on high decelerating axial diffusers and LPT profiles.
Currently, turbomachinery flows are investigated using scale-resolving numerical methods. Among other things, cascades for low-pressure turbines with rough-structure simulations (LES) are being investigated in order to analyze the influence of a high-resolution boundary-layer flow on the profile load and on the profile outflow. The results are, for example, the illustrated lower-dimensional pressure distributions of the low-pressure turbine profile MTU-T161 at different inflow conditions. In addition, as shown in the picture on the right, simulated compressor profiles are simulated with scale-resolving methods. These blades are made to flutter to provide shovel-flutter insights using aeroelastic simulations for aeroelastic damping and aeroelastic work using scale-resolved aeroelastic simulations.
Further research projects of the junior research groups is the subproject B3 "Loss Behavior of Complex Surface Structures" within the framework of the Collaborative Research Center 871. The objective of this work is the identification of the effects of the complex surface structures on the near wall flow. Together with the Institute of Multi Phase Processes a method to build surface structures by using hydrogel will developed. In combination with the particle image velocimetry, the measurement of the near wall flow at and between the surface structures is possible. Also the project "Evaluation of novel low-pressure turbine blades by means of scale-resolving simulations" within the framework of the 5th Aviation Research Program together with the MTU Aero Engines and the recently launched international joint project " ADVENTUS - Advanced Small Wind Turbines "within the German-Greek research funding of the BMBF are part of the group. Here a transfer of scale-dissolving simulation methods as well as derived models of aerodynamics and fluid-structure-interaction of aeroengine applications on wind turbines takes place.
1. Mimic, D.; Jätz, C.; Sauer, P.; Herbst, F. (2019): Total Pressure Loss Reduction in Annular Diffusers , International Journal of Gas Turbine, Propulsion and Power Systems (JGPP), April 2019, Volume 10, Number 2 2. Bode, C.; Friedrichs, J.; Frieling, D.; Herbst, F. (2018): Improved Turbulence Prediction in Turbomachinery Flows and The Effect on Three-Dimensional Boundary Layer Transition, Int. J. Turbomach. Propuls. Power 2018, 3(3), 18 DOI: 10.3390/ijtpp3030018 3. Liu, X.; Willeke, T.; Herbst, F.; Yang, J.; Seume, J.R. (2018): A Theory on the Onset of Acoustic Resonance in a Multistage Compressor, J. Turbomach 140(8), 081003 (Jul 24, 2018) (12 pages) DOI: 10.1115/1.4040551 4. Mimic, D.; Drechsel, B.; Herbst, F. (2018): Correlation Between Pressure Recovery of Highly Loaded Annular Diffusers and Integral Stage Design Parameters, J. Turbomach 140(7), 071002 (May 17, 2018) (11 pages) DOI: 10.1115/1.4039821 5. Mimic, D.; Jätz, C.; Herbst, F. (2018): Correlation between total pressure losses of highly loaded annular diffusers and integral stage design parameters, Journal of the Global Power and Propulsion Society. 2: 388-401 DOI: 10.22261/JGPPS.I9AB30 6. Gilge, P.; Hohenstein, S.; Seume, J.R. (2017): Experimental Investigation of the Aerodynamic Effect of Local Surface Roughness on a Turbine Blade, International Journal of Gas Turbine, Propulsion and Power Systems, October 2017, Volume 9, Number 3, pp.12-21 7. Koepplin, V.; Herbst, F.; Seume, J.R. (2017): Correlation-Based Riblet Model for Turbomachinery Applications, J. Turbomach 139(7), 071006, Feb 28, 2017,10 pages DOI: 10.1115/1.4035605 8. Müller-Schindewolffs, C.; Baier, R.-D.; Seume, J.R.; Herbst F. (2017): Direct Numerical Simulation Based Analysis of RANS Predictions of a Low-Pressure Turbine Cascade, J. Turbomach 139(8), 081006, Mar 21, 2017,11 pages DOI: 10.1115/1.4035834 9. Seehausen, H., Gilge, P., Kellersmann, A., Friedrichs, J., and Herbst, F., (2019): Numerical Study of Stage Roughness Variations in a High Pressure Compressor, to appear in Proceedings, International Gas Turbine Congress 2019. 10. Zieße, M., Müller-Schindewolffs, C., Seume, J., and Herbst, F. (2019): Enhanced Synthetic-Eddy-Method for Generating Moving Incoming Wakes and Turbulence in Scale-Resolving Simulations, to appear in Proceedings, International Gas Turbine Congress 2019. 11. Schwarzbach, F., Mimic, D., and Herbst, F. (2019): Profile Aerodynamics of an Oscillating Low-Pressure–Turbine Blade, to appear in Proceedings, International Gas Turbine Congress 2019. 12. Mimic, D., and Herbst, F. (2019): Influence of Transonic Flow on the Tip-Leakage Vortex in a Turbine Cascade, to appear in Proceedings, International Gas Turbine Congress 2019. 13. Mimic, D., Oettinger, M., Sauer, P., Herbst, F. (2019): Shock-Vortex Interaction in a Transsonic Turbine Cascade, Proceedings of Global Power and Propulsion Society, September 16-18 September, 2019, Beijing China 14. Hain, R.; Fuchs, T.; Wein, L.; Kluge, T.; Seume, J.; Kähler, C. J. (2019): Stereoscopic PTV measurements in the housing/rotor cavity of a shrouded turbine rotor, Proceedings of the 13th International Symposium on Particle Image Velocimetry 2019 15. Bode, C.; Friedrichs, J.; Kellersmann, A.; Herbst, F.; Seume, J.R. (2018): Modeling Transient Aircraft Engine Operation, 13th World Congress on Computational Mechanics (WCCM XIII), 2nd Pan American Congress on Computational Mechanics (PANACM II), July 22-27, 2018, New York, NY, USA 16. Gilge, P.; Seume, J.; Mulleners, K. (2018): Effect Of Surface Roughness On The Characteristic Length Scales In The Wake Of A Compressor Blade: A POD Analysis, 19th International Symposium on the Applications of Laser and Imaging Techniques to Fluid Mechanics, 16-19 July 2018, Lisbon, Portugal 17. Gilge, P.; Seume, J.R.; Mulleners, K. (2018): Analysis of Local Roughness Combinations on the Aerodynamic Properties of a Compressor Blade, 2018 AIAA Aerospace Sciences Meeting, AIAA SciTech Forum, 8-12 January 2018, Kissimmee, Florida, USA, AIAA2018-0345 DOI: 10.2514/6.2018-0345 18. Henke, M.; Herbst, F.; Rätz, H.; Seume, J.R. (2018): A New Facility for Dynamic Turbomachinery and Wind-Tunnel Testing, XXIV Biannual Symposium on Measuring Techniques in Turbomachinery Transonic and Supersonic Flow in Cascades and Turbomachines 19. Herbst, F.; Müller-Schindewolffs, C.; Schwarzbach, F.; Zieße, M.; Bode, C. (2018): Appropriate Inlet Boundary Conditions for Scale-Resolving Simulations of Turbomachinery Configurations, 13th World Congress on Computational Mechanics (WCCM XIII), 2nd Pan American Congress on Computational Mechanics (PANACM II), July 22-27, 2018, New York, NY, USA 20. Jätz, C.; Mimic, D.; Herbst, F.; Seume, J.R. (2018): Prediction Performance of the k-ε Elliptic-Blending Turbulence Model in Axial Diffusers, Proceedings of Asian Congress on Gas Turbines (ACGT) 2018, 22-24 August 2018, Morioka, Japan, ACGT2018-TS48 21. Koepplin, V.; Seume, J.R.; Herbst, F. (2017): Investigation of Local Flow Phenomena of Misaligned Riblets in a Turbulent Boundary Layer, European Drag Reduction and Flow Control Meeting, 6 April 2017, Frascati, Rome, Italy. 22. Schwarzbach, F.; Müller-Schindewolffs, Chr.; Bode, Chr.; Herbst, F.: THE EFFECT OF TURBULENT SCALES ON LOW-PRESSURE TURBINE AERODYNAMICS PART B: SCALE RESOLVING SIMULATIONS. ASME 2018 Turbo Expo, angenommen, 2018. 23. Esch C., Mueller M., Gryshkov O., Knigge S., Glasmacher B., Visualization of hemodynamics: synthesis of artificial erythrocytes with encapsulated PIV-particles via microfluidic systems and electrospraying, Int J Artif Organs. 41(9):567, 2018 DOI:10.1177/0391398818785526 24. Rusiecki T., Mueller M., Glasmacher B., Characterization of poly-sodiumacrylate-co-acrylamide hydrogels for PIV based in vitro flow analysis, Int J Artif Organs. 41(9):568, 2018 DOI:10.1177/0391398818785526 25. T. Rusiecki, P. Gilge, F. Herbst, M. Mueller, J. Seume, B. Glasmacher, A Novel nanocomposite hydrogel ink formulation for UV-based 3D printing, Int J Artif Organs 2019;42(8):441 26. C. M. Winkler, M. Mueller, B. Glasmacher, Visualization of hemodynamics: Fabrication of artificial erythrocytes with encapsulated PIV-particles via membrane emulsion technology system, Int J Artif Organs 2019;42(8):437, 2019 27. M. Mueller, T. Rusiecki, B. Glasmacher, Hydrogel coatings to improve hemocompatiblity and compliance of electrospun vascular grafts, IUPESM 2018: World Congress on Medical Physics and Biomedical Engineering, Prague, Czech Republic, 4th June, 2018 28. T. Rusiecki, M. Mueller, S. Knigge, B. Glasmacher, Light transmission refractometry for multi-phase polymers., IUPESM 2018: World Congress on Medical Physics and Biomedical Engineering, Prague, Czech Republic, 6th June, 2018