Apparatus and method for measuring instantaneous burning rate of solid propellant

The invention discloses an apparatus and method for measuring instantaneous burning rate of solid propellant. The apparatus comprises a sealed combustor, the combustor is internally provided with a weighing apparatus for placing a propellant sample to be measured, the weighing apparatus is connected to a data acquisition system in data connection, and the combustor is also connected to a pressure control apparatus which is used for controlling the pressure in a combustor chamber and an ignition device for igniting the propellant sample; the weighing apparatus is used for obtaining real time mass of the propellant sample; the data acquisition system is used for receiving real time mass information sent from the weighing apparatus, and calculating the instantaneous burning rate of the propellant sample according to the real time mass information. The apparatus and method solve the problems that instantaneous change of the burning rate cannot be measured in a condition with pressure oscillation and the like in the prior art, and high measurement precision is guaranteed.