MATHEMATICAL MODEL AND SOFTWARE DEVELOPMENT FOR MODELING ENGINES WITH PERIODICAL WORKFLOW USING AN ARTIFICIAL INTELLIGENCE SERVICE

Alexander Khrulev

Abstract


This paper examines the problem of constructing a mathematical model of a reed valve suitable for use in zero-dimensional thermodynamic and one-dimensional gas-dynamic models of pulse jet engine's operating process. The subject of the study is the reed valve of pulse jet engine. It is shown that simple, single-mass classical reed valve models lack sufficient accuracy and therefore require verification and adjusting. However, despite the large number of publications on reed valve topic, the number of studies containing experimental reed lift curves sufficient for direct verification in a frequency range close to pulse jet engine operating conditions remains limited. The objective of this study is to develop, using artificial intelligence, a single-mass mathematical model of reed motion based on a mechanical analogy of the "mass-spring-damper" type, but supplemented by a system of correction coefficients. Objective: to develop a single-mass mathematical model of a reed valve, an algorithm and a program for numerical calculation of the reed motion, to adjust the model parameters based on experimental data, to test the model performance for different designs and in different operating modes, and to evaluate its reliability and applicability. Research methods. To solve the equations of reed motion, a numerical integration algorithm was used taking into account the lift limitations and energy losses during seating and in the region of maximum lift. Published diagrams of pressure and reed lift for steel and non-metallic reeds were used as an experimental base. Results. The model parameters were tuned based on the experimental lift curves for the modes of 79.5 Hz, 90.5 Hz and 152 Hz. It was found that the proposed model provides good agreement between the calculated and experimental values of reed lift in this range of operating modes with an error of 7.4-11.3%. It is shown that the main differences between the modes are concentrated only in the region of large reed deviations. Conclusions. The developed single-mass reed valve model with correction coefficients occupies an intermediate position between the simplest unadjusted engineering models and resource-intensive spatial models, making it suitable for use in engineering analysis and preliminary design of pulse jet engines.


Keywords


UAV, pulse jet engine, reed valve, single-mass model, petal lift, numerical calculation, simulation, verification

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References


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DOI: https://doi.org/10.32620/aktt.2026.4sup1.03