关键词: 固体推进剂;燃烧速度;测量设备;气动控制

Abstract: A method about the automatic control of pressure in combustion bomb is presented in this paper. This very simple and reliable equipment consists of six parts: standard voltage, pressure sensor, arithmetic amplifier, power amplifier, relay and electromagnetism valve. The signal from the pressure sensor is compared with the standard voltage and potential difference is amplified by the power amplifier to control the relay thus to control the electromagnetism valve. The relative error of pressure fluctuation under 4MPa is between -1.0% and + 1.0%. When this method is used in depressurization extinguishment of solid pro-pellaht, there is no wasts gas back-flow to pollute the extinguished surface, and no effect on the measurement of depressurization rate.

Key words: Solid propellant;Combustion rate;Measurement equipment;Pneumatic control