Review on the Effective Parameters on the Hump Effect in Composite Solid Propellants

By comparing the empirical and predicted performance diagrams of the composite solid propellants, it appears that there is a discrepancy between these two graphs .This deviation has been attributed to spatial burning rate variation which is related to burning rate fluctuation or hump effect. The most important reasons for this spatial burning rate variation are casting process. In order to approve the effects of propellant flow during casting, on burning rate, the ballistic model include measuring burning rate of casted sample based on flow analysis may be used. In this paper, there are two assumptions which affect the burning rate deviation, the first one is based on the influence of oxidizer orientation on linear burning rate and the second one is based on the effect of casting method and slurry flow line on burning rate deviation and local burning behavior of propellant in grain. Hump effect is related to the spatial variation in burning rate which is result of rheology process of propellant slurry.