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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.142 SNIP: 0.16 CiteScore™: 0.29

ISSN Print: 2150-766X
ISSN Online: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.380
pages 360-365

EXPERIMENTAL STUDY OF TYPICAL DEFECT PROPAGATION PROCESSES IN SOLID ROCKET MOTORS

Guoqiang He
Science and Technology on Combustion, Internal Flow and Thermal-structure Laboratory, Nothwestern Polytechnique University, Xi'an 710072, China
Timin Cai
College of Astronautics, Northwestern Polytechnical University, China
Peijin Liu
College of Astronautics, Northwestern Polytechnical University, China

ABSTRACT

Anomalous combustion of solid propellant grain with defects such as gas cavity, debonding and weak-bond was investigated. A real-time X-ray radiography system (RTR) was used to obtain images of the transient processes of grain structural destruction during static firings. This paper presents the experimental investigation results from some recent test motor firings. Several main factors affecting debond propagation were studied. These include boundary constraint of solid grain, the pressurization rate of ignition, maximum chamber pressure and its duration, geometry and size of the initial debond cavity, combustion characteristics of propellant, and bonding energy of propellant/insulation. Analysis of anomalous combustion and structural destruction of propellant samples with gas cavities was conducted. Many samples with various sizes of gas cavity were fired in a quadrate test motor to analyze the factors of gas cavity propagation. An analysis of dynamic tearing between HTPB propellant and restrictor was performed. The relationship between the tearing speed and the ignition pressurization rate is discussed. The results provide some experimental bases and useful approaches for evaluating combustion safety of solid propellant grain with defects. Some conclusions in the paper were applied to fault diagnosis of some full-scale motor firing test.


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