Numerical Analysis of the Thermal State of the Resonator in a Gas-Dynamic Ignition System with Two-Phase Fuel Composition

The use of gas-dynamic ignition systems (GIS) when initiating modern high-enthalpy flow generators on basic fuel components is currently relevant. The high thermal loading of the GIS structure elements requires the prediction of life characteristics and time limits of the system’s operation. This paper presents the mathematical model and calculation results of the thermal state of the resonator, the most thermally loaded element of the GIS structure. The calculations are carried out in axisymmetric nonstationary settings, taking into account convective and radiative heat exchange between the resonator and the products of combustion, as well as the heat transfer to other elements of the GIS structure. The thermal state of the resonators made of 12Kh18N10Т steel, KhN60VT chrome-nickel alloy and BrKh08 heat-resistant bronze is investigated when the GIS is operated in continuous and pulsed modes. The GIS operating time until the start of thermomechanical failure of the resonator is determined. A comparative analysis of the obtained results is performed. Recommendations are given on the application of the considered materials when manufacturing resonators.

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