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Institute
BTU
Due to their high complexity, aero engine development
is a time-consuming and cost-intensive process. Therefore,
pre-developed proven aerodynamic and geometric
compressor information is often used as starting point and
transferred to new compressor designs. In the present paper,
a new approach for aerodynamic cloning of an already
existing compressor flow to a new compressor geometry by
use of a streamline curvature based Throughflow solver is
presented. Parameterized compressor quantities are
automatically modified with the help of optimization
strategies, and the resulting compressor aerodynamics are
compared to a reference design in each iteration step. The
target is to minimize the discrepancy between reference
design and new design regarding essential flow parameters
like de Haller number, Mach number etc., and thereby to
reproduce the aerodynamic image of the reference design.
Thus, already collected experience from existing compressor
flow fields can be used to reduce costs for developing as well
as testing of new compressor configurations. Conducted
investigations show a notable acceleration of the design
process in comparison to former strategies starting from
scratch while achieving an acceptable compliance of
aerodynamic parameters.
The present paper compares four different optimization
strategies for decoupled optimization in the context of
preliminary core engine design for aero engines. An
optimization with the AAO (All-At-Once) approach is
performed as a baseline and compared against the
performance and results of three cascaded optimization
strategies: CO (Collaborative Optimization), BLISS 2000
(Bi-Level Integrated System Synthesis) and ISOC (Interface
Segmentation Optimization Concept). The optimization
problem is based on a thermodynamic core engine model
representing an industrial application example. The results
are assessed with respect to typical requirements for
multidisciplinary core engine design. The impact of the used
optimization strategy on the performance of the optimization
concept is investigated and discussed.