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industrial flows. Within the lecture some examples of LES predictions quality will be illustrated using academic
test cases of round free jet in isothermal and heated conditions. Then some examples concerning flow predictions
in real aeroengine combustion chamber geometry with strong swirling will be presented and comparisons
between RANS modelling, k-ε and second moment closure, and LES on coarse and sufficiently refined mesh
will be analysed. Within the analysis the results obtained with commercial and academic codes will be taken
into account. Finally the method of Eulerian stochastic fields for turbulence/combustion interaction will be
discussed with examples of ignition modelling in one and three-sector combustor. Some examples on a laboratory
test cases of altitude relight at low pressure simulated with the Eulerian stochastic fields and validated with
experimental data will be discussed.
Title: Electron beam welding– actual applications in the aerospace industry
Authors: G. Ripper, Dr M. Mücke
Steigerwald Strahltechnik GmbH
Time: November 4, 2009 4:20 pm
Room: Candela
Shortage of resources and reduction of pollutant emission on the one hand, increased passenger safety and
comfort standards on the other hand demands new constructions. New concepts has forced designers to use
light-weight material and to redesign turbines in respect of higher efficiencies.
In order to achieve the higher production volumes demanded by the aerospace industry; high welding speeds
with constant quality and low operating costs are absolute requirements. Consequently, production engineers
demand alternative technologies to manufacture the complex components and to satisfy the new requirements.
Typical aircraft components for EB welding will be presented together with tailored processing machines for
these applications. To facilitate the machine operator’s work, tools are developed so that operators can weld
repeatable in shorter times.
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One important item is the recognition of the welding line. Classical it is done by using a binocular system and
a manual or automatic off line teach in procedure. After teaching the welding line, the programme will be checked
by CNC and can be started. The weld seam and the surrounding area are monitored and recorded with
a CCD camera with a high dynamic range.
With the new technology EBO JUMP the welding line is detected automatically in the area ahead of the
welding seam during the welding. An additional advantage of EBO JUMP is the implemented optoelectronic
viewing system with high depth of sharpness and variable magnification for alignment and positioning of the
work piece and the starting point before the weld starts.
To use all these advantages with already existing machines and not only for new delivered ones, the unit is
developed in that way, that it is capable of being integrated also in existing machines.
Title: High temperature properties and aging effects of soft magnetic
49%Co - 49%Fe - 2%V based alloys with high saturation and
high strength for aircraft generators
Authors: Dr W. Pieper, Dr J. Gerster
Vacuumschmelze GmbH & Co. KG
Time: November 4, 2009 4:40 pm
Room:
For an increasing number of generator and motor applications there are strength requirements to the soft
magnetic material caused by a high rotational speed. Thus additional elements were added to the standard
2-Vanadium-Permendur composition 49%Co - 49%Fe - 2%V acting as inhibitors to grain growth in the annealing
process of the material therefore increasing material strength at moderate ambient temperatures.
The alloys are also potential candidates for high temperature applications due to their high Curie temperature
of 950°C. Earlier reported were limitations of the alloys because of limited phase stability at elevated temperatures.
Yet the kinetics of the process and effects on magnetic and mechanical properties were not clear. In
the following magnetic and mechanical properties of 49%Co - 49%Fe - 2%V high strength alloys with Nb, Ta
and Zr additions at temperatures up to 500°C and long time effects like magnetic aging and high temperature
creep on a timescale >1000h are reported.
Title: First Class Refurbishment for Gasturbine Components
Authors: G. Reich , A. DeWeze, Dr A. Oppert
Turbine Airfoil Coating and Repair GmbH
Time: November 4, 2009 5:00 pm
Room: Candela
Title: Soft Magnetic Cobalt Iron Lamination Stacks for High-Performance Generators
and Motors
Authors: Dr N. Volbers, Dr W. Pieper
Vacuumschmelze GmbH & Co. KG
Time: November 4, 2009 5:20 pm
Room: Candela
Soft magnetic cobalt-iron alloys with 49% Co, 49% Fe and 2% V are commonly used materials for high performance
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