3D FEM for Rotor Thermal Bow Calculation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F23%3A00363792" target="_blank" >RIV/68407700:21220/23:00363792 - isvavai.cz</a>

Result on the web

<a href="https://www.fs.cvut.cz/ustavy/sekce-centrum-leteckeho-a-kosmickeho-vyzkumu/centrum-leteckeho-a-kosmickeho-vyzkumu-12203/centrum-12203/" target="_blank" >https://www.fs.cvut.cz/ustavy/sekce-centrum-leteckeho-a-kosmickeho-vyzkumu/centrum-leteckeho-a-kosmickeho-vyzkumu-12203/centrum-12203/</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

3D FEM for Rotor Thermal Bow Calculation

Original language description

Numerical modelling of mechanical systems is a helpful tool for system behaviour analyses. There are several well-known commercial software that deals with different solution areas. The possibility of using software is more limited when solving interdisciplinary tasks. This is due to many differences in the specific field of solutions (structural analyses, temperature distribution, or heat transfer). For the most part, finite element solvers are therefore limited to a narrow group of solvable problems, or the solvers are even very generalized to universal problems. For specific analyses of aircraft engine rotors, a FEM solver consisting of Matlab scripts was developed, in which optional boundary and initial conditions as well as the type and scope of the problem being solved are implemented. The contribution presents a sensitivity analysis of the basic thermodynamic parameters during the operation of the aircraft engine rotor and their influence on the structural analysis and, above all, the deformation of the system.

Czech name

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Czech description

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Type

R - Software

CEP classification

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OECD FORD branch

20304 - Aerospace engineering

Project

<a href="/en/project/EF16_019%2F0000826" target="_blank" >EF16_019/0000826: Center of Advanced Aerospace Technology</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Internal product ID

12203_CASR_Parez_RTB_3D

Technical parameters

The finite element method was used to build the 3D calculation model. This is a discretization method. The modeling is based on the selected dimensions of the gas generator rotor system. The modeled system is appropriately discretized into 3D elements. The outer diameter of the shaft and the length of the element were entered for each element. Material constants were assigned for each element. For each element, the quadratic moment of the cross-sectional area was calculated from the outer diameter of the given element. First, the temperature field was determined using temperature matrices ???? with two temperatures for boundary conditions on the first and last nodes and equality of heat conduction ???? in the shaft. Furthermore, stiffness matrices ???????? were compiled for individual elements, from which global stiffness matrice ???????? were compiled. The computational model is made of one isotropic material, which is steel. The material properties are Young's modulus of elasticity in tension. The entire rotor model consists of a compressor, combustor, and turbine. These are then connected by a shaft and supported in bearings. The bearings are considered in the calculation models as isotropic point supports, by adding the condition of shaft deflection to the appropriate node. The result is the deflection of the rotor system depending on the defined parameters.

Economical parameters

The economic benefit of the developed software is possible in the case of its use in the design of rotor systems as well as in the case of monitoring the behaviour of systems in operation. The software works on the basis of Matlab scripts. The input parameters are selectable without significant restrictions.

Owner IČO

68407700

Owner name

České vysoké učení technické v Praze / FS / centrum leteckého a kosmického výzkumu