A5076109802- Fluid Dynamics and Turbulent Flows
- Heat Transfer Mechanisms
- Advanced MRI Techniques and Applications
- Turbomachinery Performance and Optimization
- NMR spectroscopy and applications
- Flow Measurement and Analysis
- Nuclear reactor physics and engineering
- Combustion and flame dynamics
- Particle Dynamics in Fluid Flows
- Cyclone Separators and Fluid Dynamics
- Electrical and Bioimpedance Tomography
- Heat transfer and supercritical fluids
- Fluid Dynamics and Mixing
- Fault Detection and Control Systems
- Nuclear Materials and Properties
- Ranque-Hilsch vortex tube
- Probabilistic and Robust Engineering Design
- MRI in cancer diagnosis
- Advanced Thermodynamic Systems and Engines
- Cardiovascular Function and Risk Factors
- Fluid Dynamics and Vibration Analysis
- Nuclear Engineering Thermal-Hydraulics
- Lattice Boltzmann Simulation Studies
- Advanced X-ray Imaging Techniques
- Control Systems and Identification
University of Rostock
2018-2025
Technical University of Darmstadt
2014-2020
At the large scale turbine rig (LSTR) at Technische Universität Darmstadt, Germany, aerothermal interaction of combustor exit flow conditions on subsequent stage is examined. The resembles a high pressure and scaled to low Mach numbers. A baseline configuration with an axial inflow swirling representative for lean modeled by swirl generators, whose clocking position toward nozzle guide vane (NGV) leading edge can be varied. staggered double-row cylindrical film cooling holes endwall effect...
A study examining the internal cooling of turbine blades by swirling flow is presented. The sensitivity investigated with regard to Reynolds number, swirl intensity, and common geometric features blade-cooling ducts. system consists a straight round channel that attached generator tangential inlets. Different orifices 180-deg bends are employed as outlets. experiments were carried out magnetic resonance velocimetry (MRV) for which water was used medium. As main outcome, it found flows highly...
Purpose The purpose of this study is to provide a standard method for flow velocity measurements with phase‐contrast (PC) MRI. This can be used in vitro studies that place high demands on measurement accuracy. Clinically relevant PC MRI techniques validated using before being applied vivo. Methods Many motion‐related errors MRI, particularly misregistration, depend the timing encoding gradients pulse sequence. By synchronizing all and shortening overall interval, these significantly reduced....
Semi-dilute to dense particle-laden inertial pipe flows are studied using magnetic resonance imaging in conjunction with direct numerical simulations. In general, both methods show an excellent agreement for the time-averaged velocity and concentration profiles. Different flow regimes identified based on experimental data. For higher solid volume fractions a core-peaking distribution is found that explains observed drag decrease relative expected uniform distribution.
Abstract This study presents magnetic resonance velocimetry (MRV) Reynolds Stress measurements in a periodic hill channel with number of Re = 29,500. The velocity encoding scheme is based on the ICOSA6 method six icosahedral directions and multiple values are measured to increase dynamic range. full stress tensor obtained from voxel-wise three-dimensional Gaussian fit using magnitude data all acquisitions. MRV results compared wall-resolved large eddy simulation laser Doppler conducted same...
In order to fully understand the physical behavior of lean burn combustors and its influence on high pressure turbine stages in modern jet engines, use Computational Fluid Dynamics (CFD) promises be a valuable addition experimental techniques. The numerical investigations this paper are based Large Scale Turbine Rig (LSTR) at Technische Universität Darmstadt, Germany which has been set up explore aerothermal combustor interaction. underlying grids simulations take account complex cooling...
Abstract Open-source environments such as the Computational Fluid Dynamics software OpenFOAM are very appealing for research groups since they allow an efficient prototyping of new models or concepts. However, downstream developments to be sustainable, i.e. reproducible and reusable in long term, a significant amount maintenance work must accounted for. To growth extensibility, should underpinned by high degree automation repetitive tasks build tests, code deployment validation runs, order...
Cardiovascular engineering includes flows with fluid-dynamical stresses as a parameter of interest. Mechanical are high-risk factors for blood damage and can be assessed by computational fluid dynamics. By now, it is not described how to calculate an adequate scalar stress out turbulent flow regimes when the whole share turbulence resolved simulation method this impacts calculation. We conducted direct numerical simulations (DNS) test cases (a channel FDA nozzle) in order access all scales...
The Large Scale Turbine Rig (LSTR) at Technische Universit ät Darmstadt, Germany is used to examine the aerothermal interaction of combustor exit flow conditions on subsequent turbine stage. rig resembles a high pressure and scaled low Mach number conditions. A baseline configuration with axial, low-turbulent inflow an aerodynamic condition state-of-the-art lean modeled by means swirl generators, whose clocking position towards nozzle guide vane’s leading edge can be varied. hub side coolant...
Abstract Computational fluid dynamics (CFD) is the standard tool in turbomachinery industry to analyze and optimize internal cooling systems of turbine components, but code applied has be validated. This paper presents a combined experimental numerical study on flow field heat transfer system consisting three-pass serpentine with rib turbulators trailing edge ejection. The geometry taken from stator vane currently used an industrial gas operates at coolant inlet Reynolds number 45,000. As...
Purpose To develop a phase‐contrast (PC) ‐based method for direct and unbiased quantification of the acceleration vector field by synchronization spatial encoding time points. The proposed explicitly aims at in‐vitro applications, requiring high measurement accuracy, as well validation clinically relevant acceleration‐encoded sequences. Methods A velocity‐encoded sequence with synchronized (SYNC SPI) was modified to allow mapping replacing bipolar gradients tripolar gradient waveforms....
Abstract Magnetic Resonance Velocimetry (MRV), an imaging method based on Imaging (MRI), enables the measurement of flow parameters such as velocity and Reynolds Stress Tensor (RST) in complex structures without optical or physical access to field. Several previous studies investigated application MRV technical flows obtained results that agreed well with reference data. However, only a few have RST measurements using beyond medical applications, even though qualitative were promising,...
Magnet resonance imaging does not only have a large number of applications in the field medical examinations. In addition, several promising were also reported for measurement technical fluid flows and temperature fields devices which do allow classical access by either arrays flow meters on one hand or sensors such as thermocouples other hand. Due to fact that magnet can be performed non-invasive manner, it has advantage provide relevant data without disturbing velocity external sensor...