FEATURES OF COMBUSTION PRODUCT FLOW STRUCTURE IN A SPHERICAL SEMIOPENCAVITY

Results are presented from an experimental study of features of escape of high temperature combustion products of acetylene- and hydrogen-ai r flames through a compact circular nozzle device with a semi-open cav ity to the rear. The experiments were carried out within a shock tube apparatus, Conditions far development of pressure pulsations were dete rmined and their frequency was measured. The reactive force was measur ed as a function of nozzle critical section and oxidizer/fuel ratio. T he circular nozzle's specific impulse was determined from equilibrium thermodynamic calculations of combustion product parameters for the fu els used aad the measured reactive force values.