关键词: 膏体燃气发生器；膏体火箭发动机；多次启动；内弹道；燃烧震荡

Abstract: A pasty propellant gas generator was designed and a relatively complete start-up test was finished with it， including the determination of average flow rate of the gas generator， single and repeated start test. The purpose was to study the start-up characteristics of the flow adjustable paste gas generator based on gas pressure driven. The feasibility of using black powder ignition and repeating start-up with heat pipe， and its influence on the interior ballistic characteristics were explored. The results show that the paste gas generator has a good single and repeated start-up effect. The single start test verifies that the combustion chamber pressure was controlled by the propellant flow rate， and the thrust could be adjusted by it， and the working pressure of the combustion chamber is 1.2MPa and 1.9MPa. The repeated start test verified the feasibility of the scheme， and the shutdown time was 8s. It was found that the characteristics of shear-thinning of pasty propellant results in a slow upward trend in the internal ballistic curve. At the beginning of the start-up， combustion oscillation was found in combustion chamber during the matching process of burning rate and combustion chamber pressure. The bubble in the pasty propellant caused a certain pressure fluctuation on the internal trajectory and the pasty propellant rheological characteristics were affected by the heat transfer. The control of the position and size of the burning surface area is still a series of difficulties of the pasty propellant gas generator starts.

Key words: Pasty propellant gas generator；Pasty propellant rocket；Multiple starts；Internal trajectory；Combustion oscillation