As part of the NDV (low-pressure compressor) collaborative project, DLR Simulation and Software Technology had been supporting the DLR Institute of Material Research (WF) and Propulsion Technology (AT) since 1999, as well as industrial partner MTU, in calculating and optimising compressor blades. DLR Simulation and Software Technology assisted in solving numerical problems using standard structural applications.
DLR Simulation and Software Technology tasks
The compressor designs proposed by the DLR as well as MTU were evaluated for rigidity and vibration, and improvements were suggested. This had led to compressor designs that meet the requirements for compressor blade rigidity and vibration behaviour.
An important project goal was to reduce compressor weight, for which intensive research was being conducted on composite materials, to reinforce rotor discs as well as the rotor blades themselves. The research by DLR Simulation and Software Technology in this area was focused on the use of high quality TMC (titanium matrix composites), the manufacturing process for which was developed by the DLR Institute of Material Research. In addition to the general requirements for compressor parts (stress in blades, natural oscillation), attention must be paid to boundary conditions of great significance for TMC use, such as maximum stress at the fibre ends and internal stress in the rods. In cooperation with the DLR project partners, actionable concepts were developed for the construction of the compressor itself as well as for weight reduction using composite materials.
The effectiveness of the TMC reinforcement in reducing stress was proved using 3D FE models. Since these could be very time-consuming to set up, models were developed and verified that allowed the reliable estimation of the effects of TMC reinforcement by relatively simple means. In addition, procedures were developed to substantially simplify the use of the resulting FEM models. This was achieved with the help of special software libraries for the setup and modification of the vane models themselves and their reinforcement with TMC rods.
1999 - 2003