管型燃烧固体火箭发动机压强建立过程计算程序 输入为比热比，燃气气体常数，点火温度，推进剂密度，星角数，星角度大小，装药直径（内径和外径），喷管喉部直径，装药体积，燃速相关常数 输出为压强和工作时间-Star of solid rocket motor combustion pressure build process calculation programs for heat input than, gas gas constant, the ignition temperature, propellant density, star Angle number, star Angle size, charging diameter (inside and outside), nozzle throat diameter, charging volume, burning rate pressure and related constant output to work time