Abstract:
Using high-frequency pressure sensors Kulite XTEH-10L-190 (M) Series, pressure profiles were recorded in a transverse detonation wave propagating in an annular cylindrical chamber during continuous spin detonation of a hydrogen–air mixture. The pressure levels in the detonation wave front, in the air collector, and at the chamber outlet were determined in relation to the average static pressure recorded by low-frequency sensors (10 kHz) from “Trafag”. Pressure oscillations behind the wave front indicate complex gas dynamics of the processes in its vicinity. A region of chemical reaction was revealed behind the wave front, comprising about 6.3% of the period between waves. A decrease in the minimum excess fuel coefficient was found with an increase in pressure in the combustion chamber to 0.22, at which continuous spin detonation develops. The velocities of transverse detonation waves decrease with decreasing fuel-excess ratio and in some modes approach the ideal Chapman-Jouguet detonation velocity. Based on the total and static pressure readings at the combustion chamber outlet, the specific impulse is calculated, the maximum value of which, minus cold outflow, is 5,000 s at a fuel-excess ratio of 0.35. It is shown that the total pressure loss during air outflow from the manifold into the combustion chamber through a 6 mm wide gap (critical outflow mode) is 4 $\div$ 5% higher than during subcritical outflow through a 10 mm gap.
