Modeling of the fuel mixture formation process in the channel of a gas detonation device

Olga Shypul, Oleksii Pavlenko, Dmytro Brega, Vadym Garin, Oleg Tryfonov

Abstract


The gas-dynamic process of cyclic fuel mixture formation and filling it into the deminer channel is the subject of the study. This study aims to minimize the deviations of the mixture parameters from the stoichiometric composition determine the quantity, required consumption characteristics, and spatial position of the supply valves for fuel and oxidizer. The objectives of this study are to conduct numerical experiments on filling the deminer channel with the fuel mixture and to assess the quality of the resulting mixture, considering the limitations on the filling time. To solve this problem, a mathematical model of the physical process of mixing fuel components must be developed, considering the features of the gas-dynamic flow in the channels. The following results were obtained: a design of a cyclic mixture formation system that satisfies the functional requirements for the deminer’s operability, namely: filling time of 0.05 s and stoichiometric composition, was proposed. The homogeneity of the formed mixture was indirectly confirmed by experimental tests by comparing the maximum temperature values with those theoretically achievable for an ideal mixture. A qualitative and quantitative assessment of the proposed design’s technical solution is given. A mathematical model of the mixture generation process with a given component composition is created, and a series of numerical experiments are conducted. The modeling is performed using the ANSYS Fluent software. The calculation is performed in a non-stationary setting. The obtained values of the gas flow rate, pressure field, and temperature, the requirements for the valves, and their consumption characteristics are determined based on the calculation results. The modeling results showed that the proposed design solutions regarding the number, type, and mutual arrangement of the oxidant and fuel supply valves provide the required channel filling rate while maintaining the stoichiometric composition, which ensures stable combustion of the mixture in the detonation mode. The stoichiometric composition of the gas mixture was achieved with an accuracy of not less than 3%. The scientific novelty of the obtained results lies in determining the relationship between the geometric and gas-dynamic parameters of the mixer, which allows obtaining a mixture with the necessary characteristics of homogeneity for the vortex mixing method. The component composition was analyzed both in the pre-detonation chamber and in the deminer’s main channel. The ingress of oxygen into the main channel can become an additional trigger of detonation processes, which can be simulated based on the proposed mathematical model.

Keywords


mathematical model of multicomponent flow, stoichiometric mixture, numerical modeling, detonation, combustion

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DOI: https://doi.org/10.32620/aktt.2025.6.06