In this study, characteristics of burning rate anomaly in composite propellant grains were investigated. The burning rate anomaly has been known as "midweb anomaly," "hump factor," and so on. This paper describes some results of experimental study on effects of propellant formulations, casting processes and viscosity of propellant slurry on the phenomena. According to some past studies, it has been suggested that geometries of "isochrone surface" of propellant slurry has an influence on local burning rate. To investigate the effect of isochrone surface, visualization of the isochrone surface in composite propellant grains was carried out. And, a relation between the geometries and local burning rate that was measured with motor firing tests and strand tests was proposed. As a result, besides common static characteristics of burning rate anomaly i.e. pressure hump effect and non-isotropic characteristic of local burning rate, peculiar burning rate distribution in connection with isochrone surface was obtained.
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