降速剂及其作用位点对丁羟四组元推进剂 燃烧性能的影响规律

To study the influence of burning rate inhibitors on the combustion performance of four-component HTPB propellants, two typical burning rate inhibitors (quaternary ammonium salt and adamantane derivative) were introduced into the aluminum based composite particles with core-shell structure Al@HMX and AP@Al, and the site of action of inhibitors was set to be inside HMX particles or on the surface of AP to prepare two types of Al-based core-shell composites(Al/A@HMX, Al/B@ HMX,AP@Al/A and AP@Al/B). Results show that the heat of explosion of solid propellants can be reduced by these burning rate inhibitors, whereas the propellants containing Al@HMX in the presence of quaternary ammonium salt could be increased by 338 J/g. Thermal decomposition process of HMX and AP can be inhibited, exhibiting a "platform" with a low-intensity before the AIO irradiation peak. The inclusion of Al @ HMX can reduce the ignition delay time of corresponding propellants by 49.4%. The two kinds of burning rate inhibitors can significantly reduce the burning rates of propellants over the pressure range of 10-20MPa. A burning rate reduction or 7.1 mm/s (38.4%) and a decreasing pressure exponent of 0.25 were obtained for propellant containing Al@HMX composites and quaternary ammonium salt. The propel lant burning rate can be decreased by 5.0mm/s (27.3%) under 20MPa when 1% of quaternary ammonium salt was sited on the surface of AP.