WATER-COOLED PULSE COMBUSTOR PERFORMANCES

In this paper a part of the results obtained during experimental investigation of pulse combustion in water-cooled combustor are presented. The combustor consists of non-moving mechanical parts. The presented results show correlation between basic operational and constructional parameters of the combustor as a ground for optimization of its construction and operation. It is shown that parameters of the pulse combustion process depend not only on the geometry and heat load of the combustor, but also on the cooling intensity, that is on the combustor walls temperatures. High frequency low temperature oscillating combustion process is generated. Because the burner is constructed in a way which makes possible geometry changes of the combustion chamber, aero-valves and resonant pipe the frequency could be changed between 70 Hz and 170 Hz. Pressure oscillations inside the combustion chamber reach values over 90 kPa and the mean temperature of the combustion inside the chamber does not exceed 1450 K. It is also shown that the operation flexibility of this type in the stable operation regime regarding to geometry is up to 5:1. The results are compared with data obtained during previous investigations of pulse combustion burner with air-cooling system.