A technology for robust multi-criteria optimization of the fan blades with real deviations of airfoil geometry is proposed which includes simultaneously solving aerodynamic and mechanical integrity problems as well as balancing and arranging the blades in the row. In accordance with this technology, automated measurements of blades airfoil geometry (more than 1200 points) are used to automatically create a blade “cold” 3D model, meshing, and static and dynamic analysis of mechanical integrity. Then the model and mesh are automatically transformed in a “hot” condition and an aerodynamic analysis is carried out to estimate the measured geometry influence on fan parameters. Finally, arrangement of blades in the row is carried out based on static moments and aerodynamics analysis. The final stages of this technology are presented in this paper more detail.
A criterion is proposed for assessing the reliability of parts made of polymer composite materials in the event of sand and dust entering the compressor during take-off and landing. Conducting erosion tests with a concentration of abrasive particles corresponding to a conventional dust stream is practically impossible due to their long duration. When conducting tests with a high concentration that is several orders of magnitude higher than the concentration of a conventional stream, the reliability of the estimate is reduced due to the need to extrapolate the results to a large resource. Therefore, to improve the accuracy of the assessment of the erosion resistance of engine parts from polymer composite materials, it is proposed to conduct periodic measurements of the thickness of the part during operation. By calculating the dynamic eigenfrequencies and oscillation shapes and maximum static stresses, the critical thickness of the part is established, below which its eigenfrequency approaches the dangerous rotor harmonics.
Computational and experimental studies have been carried out to evaluate the robustness and durability of components produced of polymer composite materials (PCM), as a part of the modernization of the low-pressure compressor (LPC) of the engine for the regional aircraft. For a preliminary assessment of the static and dynamic strength of the parts, a series of three-dimensional finite element calculations and tests of laboratory specimens, structural elements cut from finished parts, have been performed. Testing the laboratory samples made it possible to compare the obtained mechanical properties with the properties declared by PCM suppliers and to conduct a mor e correct assessment of the safety margins of the parts. To decide whether to install parts on the engine, fatigue and erosion tests of the structural elements cut from the finished parts were carried out. The final decision on the performance of the PCM parts was made after testing them as part of the upgraded LPC on the engine. The criterion for evaluating the erosion resistance of PCM parts has been introduced, which makes it possible to assess their performance during operation.
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