Ruopp, A., Daus, P., Biskup, F., Riedelbauch, S.: Performance prediction of a tidal in-stream current energy converter and site assessment next to Jindo, South Korea. Journal of Renewable and Sustainable Energy.7, (2015).
Ruopp, A., Ruprecht, A., Riedelbauch, S., Arnaud, G., Hamad, I.: Development of a hydro kinetic river turbine with simulation and
operational measurement results in comparison. IOP Conference Series: Earth and Environmental Science.22,062002 (2014).
The development of a hydro-kinetic prototype was shown including the
compound structure, guide vanes, runner blades and a draft tube section
with a steeply sloping, short spoiler. The design process of the
hydrodynamic layout was split into three major steps. First the compound
and the draft tube section was designed and the best operating point
was identified using porous media as replacement for the guide vane
and runner section (step one). The best operating point and the volume
flux as well as the pressure drop was identified and used for the
design of the guide vane section and the runner section. Both were
designed and simulated independently (step two). In step three, all
parts were merged in stationary simulation runs detecting peak power
and operational bandwidth. In addition, the full scale demonstrator
was installed in August 2010 and measured in the St. Lawrence River
in Quebec supporting the average inflow velocity using ADCP (Acoustic
Doppler Current Profiler) and the generator power output over the
variable rotational speed. Simulation data and measurements are in
good agreement. Thus, the presented approach is a suitable way in
designing a hydro kinetic turbine.
Daus, P., Ruopp, A., Biskup, F., Arlitt, R.: Performance prediction of a tidal in-stream current energy converter.3rd IAHR Europe Congress, Book of Proceedings, 2014, Porto -Portugal (2014).
The magnitude of energy, which is extracted by tidal energy converter
devices, has a significant impact on the commercial viability of
an entire project. Therefore a substantialcharacterization of the
tidal current at the location of interest and subsequently a confident
prediction of the electricity production of the tidal energy converter
at an early stage of the project is of high interest. This paper
deals with a method to estimate the production of a single device
using results from a 2D shallow water equation model combined with
turbine performance curves and its validation by performance data
from operations of the Voith prototype HyTide 110-5.3 under real
conditions in Jindo, South Korea. A recently developed 2D shallow
water equation solver based on OpenFOAM (tidalFoam) is used to accurately
simulate the tidal current around the installation location of the
device.High-resolved bathymetry data, shorelines and tidal elevation
at the open boundaries of the unstructured mesh is used to set up
the model. The bottom friction as an additional implicit source term
in the model is used to calibrate the simulation against Acoustic
Doppler Current Profiler (ADCP) measurements at site. The expected
electricity production is compared with actual field measurements
during the operation of the Voith scaled demonstrator. The complete
analysis and results gives valuable and significant confidence in
the performance expectation of the single tidal turbine. The results
show that the production of single devices can be accurately estimated.
This grants an important first input to commercial evaluations of
future tidal energy projects.
Ruopp, A., Daus, P., Ruprecht, A., Riedelbauch, S.: A Two-Dimensional Finite Volume Shallow Water Model for Tidal Current
Simulations Using OpenFOAM® - Numerical
Validation and High-Resolution Ocean Modelling Case.EWTEC, Aalbourg, Denmark. S. 10. , Aalborg, Denmark (2013).
Ruopp, A., Daus, P.: Simulation von Gezeitenströmungen zur Standortanalyse und Bestimmung
vorhandener Potenziale. Wasserwirtschaft.103,54 - 57 (2013).
The paper addresses the experimental investigation of the unit cell
architecture in a structurally stitched multilayer carbon-fibre preform.
Each layer is a multiaxial multiply non-crimp fabric (NCF) knit with
a non-structural stitching. The term structural presumes here that
the stitching yarn does not only consolidate the plies (as the non-structural
one does) but also forms a 3D reinforcement. One stitching technique tufting is studied, with 120 tex aramide yarn. The experimental
data reveals a considerable irregularity of the piercing pattern
and fibre distribution.
Koissin, V., Ruopp, A., Lomov, S.V., Verpoest, I., Witzel, V., Drechsler, K.: On-surface fibre-free zones and irregularity of piercing pattern
in structurally stitched NCF preforms. Advanced Composites Letters.15,81--88 (2006).
The paper addresses the surface imperfections (openings in fibrous
plies) and irregularity of the piercing pattern in structurally stitched
multilayer carbon-fibre preforms. Each layer is a multiaxial multiply
non-crimp fabric (NCF) with a non-structural stitching. The term
?structural? presumes here that the stitching yarn does not only
consolidate the plies (as the non-structural one does) but forms
also a through-the-thickness (3D) reinforcement. Four stitching methods
are studied: ordinary CNC-sewing, tufting, dual-needle, and curved
needle techniques with multifilament yarns: aramide (60 or 120 tex)
or glass (204 tex). In total, 14 stitching cases are investigated
experimentally. It is observed that a non-negligible variability
exists in the meso-level geometry of the reinforcement. The geometrical
characterization provides important input data for analysis of the
permeability and mechanical properties of the preforms.