# Mathematical modeling of the processes of air gas thermodynamics of the supersonic aircraft with a ramjet

 1Timoshenko, VI, 1Galinskiy, VP1Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine, Dnipropetrovsk, Ukraine Space Sci. & Technol. 2020, 26 ;(2):03-18 https://doi.org/10.15407/knit2020.02.003 Publication Language: Russian Abstract:  The main issues of the development of design and methodological support for carrying out operational integrated calculations of thermogasdynamic processes in the components of a ramjet engine, integrated with the body of the aircraft, are discussed. The numerical simulation of the flow in a ramjet engine is divided into three components - flow past the aircraft body, flow in the air intake device (AID), the combustion chamber and the nozzle with the exhaust stream. The calculation of supersonic flow near the body of the aircraft, in the entrance part of the AID and in the exhaust jet is carried out in the non-viscous approximation using the Godunov scheme or taking into account the viscosity using the “viscous layer” model. In the region of subsonic flow in the output part of the AID and subsonic nonequilibrium flow in the combustion chamber is calculated using the “narrow channel” model or in the quasi-one-dimensional approximation. The issues of selecting the geometric parameters of the combustion chamber and the near-critical part of the exit nozzle in the case of setting the flow parameters at the outlet of the AID are discussed. The analysis of various models of ignition and combustion of kerosene in the combustion chamber is accomplished. The flow in the exhaust jet is calculated taking into account the flow past the lower tail portion of the surface of aircraft and the interaction of the jet with a disturbed incoming flow of air. Presents the results of the estimated two dimension calculations of individual elements and the complete layout of the stylized aircraft. Keywords: air intake device, aircraft, combustion chamber, exhaust jet, kerosene combustion, marching calculation methods, nozzle, operational numerical calculation, ramjet, thermogasdynamic processes
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