Numerical Solution Validity Analysis of the Conjugated Problem of Aerodynamics, Heat Exchange and Strength for Icing Conditions Assessment

Aeronautical and Space-Rocket Engineering


Аuthors

Mikhailov D. A.1*, Pykhalov A. A.1, 2**, Zotov I. N.1***

1. Irkutsk National Research Technical University, 83, Lermontov str., Irkutsk, 664074, Russia
2. Irkutsk State Transport University (IrGUPS), 15, Chernyshevsky str., Irkutsk, 664074, Russia

*e-mail: d.mikhaylov.835@yandex.ru
**e-mail: pikhalov_aa@irgups.ru
***e-mail: zegor-2008@yandex.ru

Abstract

The article deals with the development of interdisciplinary analysis technology as applied to the aerospace industry, where particularly critical assemblage are being exposed to high-energy flows.
Interdisciplinary analysis is represented by the conjugate problems, namely gas dynamics, heat exchange and strength, solution. As the result of the specified problems solving, the strain-stress was obtained, which is being employed afterwards for the analysis of its possible icing under the air masses impact.
It is supposed initially that the gas-dynamic analysis of the body being studied was performed, and there is a finite-element grid with certain density, and pressure and temperature distribution fields on the surface of the body. Cylindrical (simplified) body shape necessary for the possibility of numerical modeling results verification relative to the analytical computations at each stage of the interdisciplinary analysis is employed.
The possibility of the available grid with certain density of the finite elements for further computations is being considered at the first stage. In particular, comparison of the solid cylinder temperature values obtained by both analytical and numerical methods when heated in a non-stationary formulation demonstrated high convergence. Here, the main result is a graph of the body temperature dependence at the axis and its cylindrical part on time.
At the second stage, as the result of studying the thermal state of the body and external forces under the impact of an air-flow, boundary conditions for strength analysis were obtained.
At the third stage, verification of the numerical simulation on studying the stress-strain state was performed by comparing its results with the analytical solution. Stresses being obtained at the point with the maximum airflow pressure demonstrated high convergence for a body from a linearly elastic material.
The final stage is numerical simulation of the cylindrical body icing with account for the deformations and other parameters obtained in the previous stages, which results allowed revealing that at the flow-around of the bodies under conditions of modern aircraft flight, intensive ice build-up is being observed that may lead to a desaster without undertaking counteracting measures.

Keywords:

conjugate analysis of icing, conjugate problem verification, interaction scheme in computing, boundary conditions exchange, droplet deposition efficiency, ice build-up rate

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