Analysis and improvement of calculation of parameters of free gas flow around a vertical plate or cylinder to be used when studying aircraft thermal conditions at the launch complex
Published: 14.05.2025
Authors: Barmin I.V., Romanyak A.Yu., Matveeva O.P.
Published in issue: #5(161)/2025
Category: Aviation and Rocket-Space Engineering | Chapter: Design, Construction, Production, Testing, and Operation of Aircraft
The paper considers specifics in a free air convection from the vertical surfaces relevant for estimating thermal conditions in the area under the payload fairing at the launch complex in order to develop a unified formula for determining the local Nusselt numbers. It provides a review and analysis of publications, as well as systematization of experimental data on determining the local Nusselt numbers, and estimates the experimental conditions effect on the measurement results. The approximation dependence form and parameters are selected using the multi-parameter logistic curve, statistical methods and quality criteria (determination coefficient and average approximation error). A new unified formula is developed to describe free convection in a wide range of the Rayleigh numbers with high accuracy; the formula includes the described transition region for the first time. Its application increases reliability in applied validation of the software packages.
EDN LGSFIU
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