Determination of the optimal system of shock waves in the air intake taking into account the dissociation of the incoming air molecules

Authors: Bugay V.V., Shostov A.K.
Published in issue: #1(78)/2023
DOI: 10.18698/2541-8009-2023-1-857
Category: Aviation and Rocket-Space Engineering | Chapter: Aircraft Dynamics, Ballistics, Motion Control
Keywords: mach number, shock wave, air intake, supersonic flow, mathematical modeling, maximum total pressure, dissociation of molecules, deceleration parameters
Published: 15.02.2023

The parameters of the oncoming flow behind an oblique shock wave are compared in calculations with and without allowance for the dissociation of air molecules. The limits of applicability of the last method are revealed. The degree of atmospheric air dissociation is calculated for different pressures with increasing static temperature. The conditions for obtaining the maximum coefficient of restoration of the total pressure of the air intake device are determined, taking into account the dissociation of air at different air flow velocities. Mathematical modeling was carried out in the Python programming language using the Cantera library, designed for thermodynamic calculation. The results obtained will be useful in choosing a method for calculating air intake devices depending on the speed of the aircraft.

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