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Engine Measurement Systems
Dr. Christian Willert

Objectives:

Development and application of laser optical measurement techniques for the aerothermodynamic investigation of aero engine components

development of measurement systems with special design to application demands to achieve best possible measurement accuracy
development of new measurement systems to contribute to the desired progress in turbomachinery research
application of the mobile measurement system in home and on customers site
design and adaptation of test rigs for measurement application.

Applications:

statonary and periodically instationary reacting and non reacting flows in:

axial and centrifugal compressors, axial and radial turbines (rotor and stator), cascades, flames, combustion chambers, nozzles, tubeflows, windtunnels and in-flight applications

Qualifications:

Engineers and physicists with special knowledge in:

optics, electronics, spectroscopy, lasers, particle generation and sizing, light guide fibers, experimental thermodynamics, photodetectors, CCD-cameras, data processing, process control, digital image processing etc.

CARS - Coherent anti-Stokes Raman Spectroskopy
Dr.rer.nat. Michael Fischer

In real combustion chambers mixing and residence time of the reactants at specific pressures and temperatures are of major importance for the combustion efficiency and the reduction of pollutants.

DGV - Doppler Global Velocimetry
Dr.rer.nat. Guido Stockhausen, Dr.phil.Christian Willert

Doppler Global Velocimetry (DGV) is a velocity measurement technique capable of recovering planar three-component velocity data. The method relies on a direct measurement of the frequency-shifted light scattered by moving particles suspended in the flow under investigation (i.e. Doppler effect).

L2F - Laser-2-Focus (or LT - Laser Transit) Velocimetry

The Laser-2-Focus (L2F) technique is applied in the non-intrusive measurement of flow velocity vectors in gases and liquids. Here the velocity of extremely small particles is recorded which are usually present in all technical flows or may be added if required.

PLIF - Planar Laser Induced Fluorescence
Dr.rer.nat. Johannes Heinze

Planar LIF is a laser based measurement technique for non intrusive studies of combustions and flows. The ultraviolet light of a pulsed laser system is formed to a vertical sheet (stripe) and focussed into the combustion or flow e.g. into the near development field of a burning spray.

PIV – Particle Image Velocimetry
Dr.-Ing. Melanie Voges, Dr.phil. Christian Willert

Measurements of instantaneous velocity fields could be done with the time and place high-resolution Particle-Image-Velocimetry (PIV). This technique is a scientific tool for qualitative and quantitative investigations of flow fields.

QLS - Quantitative Light Scattering Technique
Dipl.-Ing. Melanie Voges, Dr.phil. Christian Willert

QLS is designed as a planar laser optical measurement technique for the quantification of the mass concentration in mixing flows. It is based on elastically scattered laser light (Mie scattering), where the luminant sources are small scattering particles that have to be added to one of the flow components.

Contact

Dr.phil. Christian Willert
German Aerospace Center
Institute of Propulsion Technology, Triebwerksmesstechnik
Köln
Tel.: +49 2203 601-2308

Hochdruck - Kühlungsprüfstand (HPCR) Köln

Strömungs - geschwindigkeits - messungen mit DGV im Europäischen Transsonischen Windkanal (ETW)

DLR-Innovationpreis 2004 an Mitarbeiter des Instituts für Antriebstechnik für das DGV-Verfahren

Erfolgreiche DLR-ONERA Kooperation – Doppler Global Velocimetry in Windkanalanwendung

Engine Measurement SystemsDr. Christian Willert

CARS - Coherent anti-Stokes Raman SpectroskopyDr.rer.nat. Michael Fischer

DGV - Doppler Global VelocimetryDr.rer.nat. Guido Stockhausen, Dr.phil.Christian Willert