Measurement and Analysis on the Heating Characteristics of a Gas-Dynamic Resonance Tube

Under specific inflow conditions at the open end of a gas-dynamic resonance tube, a strong thermal effect can be generated inside the tube and a high temperature source is formed. In order to study the characteristics of resonance heating, experimental measurement and theoretical analysis on a thin-wall cylindrical stainless-steel gas-dynamic resonance tube are carried out in this paper. Experiments were conducted on a nozzle-resonance tube system mainly excited by nitrogen. Hydrogen was also used for comparison under typical working conditions. The incoming gas pressure and the separation distance between the nozzle exit and the tube inlet were adjusted for different working conditions. The temperatures at multiple wall points along the tube length were measured. Experimental results show that the temperatures along the tube length increase sequentially from the inlet to the end and the strongest heating effect of the resonance tube can be achieved under specific inflow matching conditions. Analysis of the experimental data reveals that the temperature distribution function along the resonance tube is approximately a series of concave parabolic curves. The maximum ratio of the temperature rise to the mean temperature of the corresponding tube length is about 1.8. This study attempts to provide some guidance for the design and improvement of high-temperature resonance heating devices which can be used as heat sources for aerospace ignition systems.