Microporous Too Root Preparation And Combustion Performance Of Propellant

By utilizing supercritical fluid foaming technology, this paper has prepared the microporous TEGDN propellants with the pore-shell structure in the process of supercritical CO2fluids distribution heating-up foaming. How the foaming process conditions such as saturation time, saturation pressure, foaming temperature, saturation temperature, desorption time affect the foam morphology of microporous TEGDN propellants has been systematically researched. Moreover, microporous morphology has been characterized by scanning electron microscopy, combustion behavior and combustion performance of microporous TEGDN propellants also have been preliminarily researched through the suspension of combustion and the closed bomb test.The photograph of scanning electron microscopy shows that with increase of saturation time or saturation temperature or saturation pressure, cell density was increased while cell diameter was decreased; the impact of foaming temperature on cell morphology is a little more complex and the experiment result shows that the optimum foaming temperature is about80℃; with increase of desorption time,cell density was decreased while cell diameter and cortical thickness was increased. The suspension of combustion result shows that the combustion of microporous TEGDN propellants easily starts from the two ends, then along the axial direction goes into the core layer, finally gets into interior portion with wedge shape until interconnect. The closed bomb test result shows that the burning rate of microporous TEGDN propellants has been improved. During burning initial stage, the dynamic activity value of microporous TEGDN propellants is significantly higher than that of conventional propellants,which shows progressive combustion in a short time, however after this surface-reduction combustion is longer.Through the research on principle, method and process of microcellular foaming of microporous TEGDN propellants, as well as influencing factors of micropore morphology and combustion performance, the paper lay experimental foundation of the preparation and application of microporous TEGDN propellants.