The aim of the study is to adapt the ANSYS CFX and ANSYS Mechanical engineering analysis systems for numerical calculations of acoustic processes in the model channels of an aircraft engine. Numerical experiments were carried out in the 2FSI (2-way Fluid-Structure Interaction Explained) formulation, which allows taking into account the interaction between the gas and the structure. A mathematical model for gas-dynamic processes is formulated, which is based on the laws of conservation of mass, momentum, energy and is closed by the equations of state of an ideal compressible gas and turbulence. A mathemati-cal model is formulated for estimating the stress-strain state of a structure, taking into account the movement of the partition in the framework of the linear theory of elasticity. Boundary conditions are determined. The task of the study was to evaluate the influence of the choice of the type of partition material on the propagation of a sound wave along the flow to the partition and beyond. As a partition, materials were chosen that differ in the value of the modulus of elasticity and Poisson's ratio, steel, tita-nium and polyethylene. Graphical dependences of the pressure amplitude at six control points are obtained. Graphs of moving partitions depending on the type of material are obtained. Computational experiments were carried out at Perm National Re-search Polytechnic University using the computing resources of the cluster of the Center for High-Performance Computing Sys-tems.
The present work details a new approach to the study of GTU rotor vibrations, based on the solution of a related dynamic problem for the «gas – dynamic flow – deformable structure» sys-tem. The modern tendency to increase an aggregates power with a simultaneous decrease stiffness results in new phenomenons that affected a rotor vibration state. The compressor rotor model with a labyrinth seal is considered. ANSYS software product is used. The calculations were carried out on a high-performance computer complex PNRPU. The performed calculations showed a qualitative and quantitative effect of a gas-dynamic gap on the rotor dynamics. A 2FSI calculations series was performed to study the influence of geometric, kinematic and gas-dynamic parameters on the rotor dynamic state. A pressure fluctuations spectral analysis in the gas-dynamic gap and displacements has been carried out. The obtained spectrograms pro-cessing it possible to plot amplitudes and frequencies dependences of resonant pressure oscil-lations over an initial pressure in the gas-dynamic gap. It was found that the initial pressure in a gas-dynamic gap has the greatest influence. A rotor and gas oscillations resonant frequency was found, which corresponds to a change in the shaft axis spatial position. The «gas – struc-ture» system resonant frequencies were obtained for models differing in mass and stiffness. A decrease in an elasticity modulus of the structure led to a decrease in the maximum pressure fluctuations amplitude, while a decrease in mass led to its increase. For the base model and the model with lower rigidity, the resonant pressure oscillations frequency depends on the initial pressure value according to a law close to linear, while for the model with a lower mass, the dependence has a pronounced non-linear character.
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