Dr. Michael Hilfer

Bio

Michael Hilfer is a senior scientist at the Institute of Fluid Mechanics with a research focus on optical measurement and data assimilation techniques, applied to a wide range of research areas from low-speed to transonic and super/hypersonic flows. He earned his degree in Aerospace Engineering from Stuttgart University and his Ph.D. from the University of Durham (UK), where his research focused on developing fluidic curtain sealings in turbomachinery applications (patent: US10301959B2). After completing his Ph.D., Michael joined DLR, where he worked on developing Pressure- and Temperature-Sensitive Paint (PSP/TSP) measurement methods in the Experimental Methods Department at the Institute of Aerodynamics and Flow Technology in Göttingen. Before joining TU Braunschweig, he led a team of researchers at the DLR Institute of Electrified Aero Engines in Cottbus, working on systems for electrified aviation. Currently, his primary research interests include optical measurement techniques such as PSP, TSP, PIV, STB, and EVB; experimental techniques for highly unsteady flows; acoustics; flow separation and reattachment; data assimilation and post-processing; and machine learning for fluid dynamics.

Publications

Category A

• 2024, Petersen, A. and Hilfer, M., 2024. Boundary Layer Analysis of a Transonic High-Pressure Turbine Vane Using Ultra-Fast-Response Temperature-Sensitive Paint. Journal of Turbomachinery, 146(9). DOI: 10.1115/1.4065739
• 2023, Katzenmeier L, Hilfer M, Stegmüller J, Breitsamter C. Application of fast-response pressure sensitive paint to low-speed vortical flow at high angles of attack. Experiments in Fluids. 2023 Oct;64(10):166. DOI: 10.1007/s00348-023-03707-7
• 2023, Lemarechal, J., Dimond, B.D., Barth, H.P., Hilfer, M. and Klein, C., 2023. Miniaturization and model-integration of the optical measurement system for temperature-sensitive paint investigations. Sensors, 23(16), p.7075. DOI: 10.3390/s23167075
• 2023, Tabassum, S., Hilfer, M., Brakmann, R.G., Morsbach, C., Willert, C., Matha, M. and Schroll, M., 2023. Assessment of Computational Fluid Dynamic Modeling of Multi-Jet Impingement Cooling and Validation With the Experiments. Journal of Turbomachinery, 145(7), p.071005. DOI: 10.1115/1.4056715 
• 2023, Goessling, J., Fischer, F., Seume, J.R. and Hilfer, M., 2023. Uncertainty and validation of unsteady pressure-sensitive paint measurements of acoustic fields under aero engine-like conditions. Experiments in Fluids, 64(2), p.22. DOI: 10.1007/s00348-022-03558-8
• 2022 - Bitter, M., Hilfer, M., Schubert, T., Klein, C. and Niehuis, R., 2022. An ultra-fast TSP on a CNT heating layer for unsteady temperature and heat flux measurements in subsonic flows. Sensors, 22(2), p.657. DOI: 10.3390/s22020657
• Hogg, S. and Hilfer, M., Cummins Ltd, 2019. Seal assembly. U.S. Patent 10,301,959.
• 2020, Schramm, J.M. and Hilfer, M., 2020. Time response calibration of ultra-fast temperature sensitive paints for the application in high temperature hypersonic flows. In New Results in Numerical and Experimental Fluid Mechanics XII: Contributions to the 21st STAB/DGLR Symposium, Darmstadt, Germany, 2018 (pp. 143-152). Springer International Publishing. DOI: 10.1007/978-3-030-25253-3_14
• 2012, Hilfer, M., Ingram, G. and Hogg, S., 2012, June. Endwall profiling with tip clearance flows. In Turbo Expo: Power for Land, Sea, and Air (Vol. 44748, pp. 1099-1108). American Society of Mechanical Engineers. DOI: 10.1115/gt2012-68488

Category B

• 2022, Hilfer, M., Behn, M., Klein, C., Ahlefeldt, T., Tapken, U., Koop, L. and Enghardt, L., 2022. Near-field measurements of stationary and rotating in-duct sound sources with pressure-sensitive paint. In 28th AIAA/CEAS Aeroacoustics 2022 Conference (p. 3056). DOI: 10.2514/6.2022-3056
• 2020, Hilfer, M., Klein, C. and Mayer, F., 2020. Aeroacoustic measurements with fast response pressure sensitive paint in a cavity at transonic mach numbers. DOI: 136605  
• 2020, Sato, H., Yorita, D., Hilfer, M., Henne, U., Klein, C., Saito, Y., Nonomura, T. and Asai, K., 2020. Parametric investigations for frequency-domain lifetime PSP technique (FLIM). In AIAA Scitech 2020 Forum (p. 0293). DOI: 10.2514/6.2020-0293
• 2018, Ondrus, V., Hilfer, M., Henne, U., Costantini, M., Weiss, A., Klein, C. and Beifuss, U., 2018, July. Development of sensors for ambient temperature measurement. In 5th International Conference on Experimental Fluid Mechanics 2018 (No. 40, pp. 358-363). Institute of Fluid Mechanics and Aerodynamics, Universität der Bundeswehr München, Germany. DOI: 10.18726/2018_2 
• 2020, Gößling, J., Ahlefeldt, T. and Hilfer, M., 2020. Experimental validation of unsteady pressure-sensitive paint for acoustic applications. Experimental Thermal and Fluid Science, 112, p.109915. DOI: 10.1016/j.expthermflusci.2019.109915
• 2017, Hilfer, M., Dufhaus, S., Petersen, A., Yorita, D. and Klein, C., 2017, January. Application of pressure-and temperature-sensitive paint on a highly loaded turbine guide vane in a transonic linear cascade. In Proceedings of the Global Power and Propulsion Society Forum, Zurich, Switzerland (pp. 16-18). DOI: 105917
• 2015, Hilfer, M., Hogg, S. and Ingram, G., 2015, June. Experimental validation of a curtain type fluidic jet seal on a turbine rotor shroud. In Turbo Expo: Power for Land, Sea, and Air (Vol. 56734, p. V05CT15A012). American Society of Mechanical Engineers. DOI: 10.1115/gt2015-42624
• 2014, Mank, S., Duerrwaechter, L., Hilfer, M., Williams, R., Hogg, S. and Ingram, G., 2014, June. Secondary flows and fillet radii in a linear turbine cascade. In Turbo Expo: Power for Land, Sea, and Air (Vol. 45622, p. V02CT38A011). American Society of Mechanical Engineers. DOI: 10.1115/gt2014-25458
• 2014, May Estebaranz, A., Hogg, S., Hilfer, M. and Dyer, P., 2014, June. A Static Test Facility for the Study of Deposit Fouling on Steam Turbine Blades. In Turbo Expo: Power for Land, Sea, and Air (Vol. 45585, p. V01BT27A014). American Society of Mechanical Engineers. DOI: 10.1115/GT2014-25517
• 2013, Auld, A., Hilfer, M., Hogg, S., Ingram, G. and Messenger, A., 2013, June. Application of an air-curtain fluidic jet type seal to reduce turbine shroud leakage. In Turbo Expo: Power for Land, Sea, and Air (Vol. 55140, p. V03AT15A005). American Society of Mechanical Engineers. DOI: 10.1115/GT2013-94198

Dr. Michael Hilfer's full list of publications can be found here.