Study of the thermal state of a resonator in a gas-dynamic system initiating monopropellant decomposition

The development of small high-enthalpy plasma generators (SHEPG) is dictated by the use of ecological high-energy monopropellants including nitrous oxide (N₂O). Gas-dynamic resonance systems (GRS) have great potential in initiating the decomposition of N₂O in SHEPGs. This paper deals with the mathematical modeling of the thermal state of GRS resonant cavity walls, which is very important because of high heat loads acting on these structural elements. The results of test calculations of temperature distribution in resonant cavity walls are presented for the case of N₂O decomposition. The critical times of continuous and pulsed GRS operation are determined. The GRS endurance is analyzed taking into account various heat-resistant materials and protective coatings deposited on resonant cavity walls. The results of the numerical analysis are compared with experimental studies. The potential use of a gas-dynamic initiation system is discussed, and the methods of increasing its endurance as applied to various power plants using N₂O as a monopropellant are proposed.

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