Martin Bitter

Correction: A Compact Low-loss Additive-manufactured Redirecting Heat Exchanger (CLARE): Numerical Benchmark of Aerothermal Performance

Jürgen Inkoferer, Dragan Kožulović, Martin Bitter

de (code pays fourni par la source)

A Synthetic Sensitivity and Parameter Analysis for Transient Multi Hole Probe Measurements

Samuel Eilers, Dragan Kožulović, Martin Bitter

Transient pneumatic probe traverses enable a significant reduction in measurement time compared to conventional pointwise measurements, but require a correction of the measured pressure signal due to the dynamic response of the pneumatic system. This paper investigates the validity of approximating the …

de (code pays fourni par la source)

On the Validity of Applying a Conventional Wedge Probe to Transonic Vorticial Flows

Julian Storr, Dragan Kožulović, Martin Bitter

This study investigates the applicability of a wedge-type five-hole probe, originally designed and calibrated for two-dimensional flow conditions, when operated in a three-dimensional transonic flow field. For this purpose, the original calibration is compared with a dedicated three-dimensional calibration on the basis …

de (code pays fourni par la source)

A Compact Low-loss Additive-manufactured Redirecting Heat Exchanger (CLARE): Numerical Benchmark of Aerothermal Performance

Jürgen Inkoferer, Dragan Kožulović, Martin Bitter

de (code pays fourni par la source)

A Compact Low-loss Additive-manufactured Redirecting Heat Exchanger (CLARE): Experimental Validation Strategy & First Results

Martin Bitter, Simon Dankerl, Jürgen Inkoferer, Dragan Kožulović

This paper presents the development and validation strategy for disruptive heat exchangers produced by additive manufacturing (AM). These innovative heat exchangers feature an S-shaped flow passage designed to enhance diffusion and heat transfer, as well as an outlet redirection that minimizes flow …

de (code pays fourni par la source)

A Compact Low-loss Additive-manufactured Redirecting Heat Exchanger (CLARE): The evolution of aerodynamic efficiency

Jürgen Inkoferer, Dragan Kožulović, Martin Bitter

• Evoluted heat exchanger shows increased highspeed performance under oblique inflow • Staggering and contouring the leading edge have similar benefits • Homogenizing the inflow and reducing the leading edge separation is essential This paper presents the evolution of a matrix starting …

de (code pays fourni par la source)

Total pressure losses from planar Particle Image Velocimetry data: A practical approach for accurate wake flow assessment at turbomachinery-relevant Mach & Reynolds numbers

Martin Bitter, Dragan Kožulović

This work presents a hybrid approach for determining total pressure fields, which were reconstructed from Particle Image Velocimetry data and whose accuracy was raised through in-situ correction with probe-based reference data. The quality of this general approach is validated for turbomachinery-relevant Mach …

de (code pays fourni par la source)

Robust and Accurate Transient Multi-Hole Traverses: A Physical Approach Using Laplace Transform

Samuel Eilers, Dragan Kožulović, Martin Bitter

Abstract A novel method for faster pneumatic wake loss measurements of steady flow fields through transient traversing is proposed and evaluated. This method accounts for dynamic effects of the pneumatic measurement chain with a transfer function of first and second order. By …

de (code pays fourni par la source)

Total pressure losses from planar Particle Image Velocimetry data: A practical approach for accurate wake flow assessment at turbomachinery-relevant Mach & Reynolds numbers

Martin Bitter, Dragan Kožulović

This work presents a hybrid approach for determining total pressure fields, which were reconstructed from Particle Image Velocimetry data and whose accuracy was raised through in-situ correction with probe-based reference data. The quality of this general approach is validated for turbomachinery-relevant Mach …

de (code pays fourni par la source)

Characterization of the Endwall Flow in a Low-Pressure Turbine Cascade Perturbed by Periodically Incoming Wakes, Part 1: Flow Field Investigations with Phase-Locked Particle Image Velocimetry

Tobias Schubert, Dragan Kožulović, Martin Bitter

Particle image velocimetry (PIV) measurements were performed inside a low-pressure turbine cascade operating at engine-relevant high-speed and low-Re conditions to investigate the near-endwall flow. Of particular research interest was the dominant periodic disturbance of the flow field by incoming wakes, which were …

de (code pays fourni par la source)

Characterization of the Endwall Flow in a Low-Pressure Turbine Cascade Perturbed by Periodically Incoming Wakes, Part 2: Unsteady Blade Surface Measurements Using Pressure-Sensitive Paint

Tobias Schubert, Dragan Kožulović, Martin Bitter

Unsteady pressure-sensitive paint (i-PSP) measurements were performed at a sampling rate of 30 kHz to investigate the near-endwall blade suction surface flow inside a low-pressure turbine cascade operating at engine-relevant high-speed and low-Re conditions. The investigation focuses on the interaction of periodically …

de (code pays fourni par la source)

Experimental study on flow phenomena induced by trailing edge shapes for a transonic high pressure turbine cascade

Gohl Ines, Martin Bitter, Hiroki R. Sato, Dragan Kožulović

The present study focuses on the influence of the trailing edge shape and on the development of coherent structures in the transonic flow of a turbine blade passage.Experiments were performed in the High-speed Cascade Wind Tunnel of the University of the Bundeswehr …

de, jp (code pays fourni par la source)