Some of most widely used two-dimensional grain configurations are end burning (EB), internal burning tube (IBTG), slotted tube grain (STG), and star grain (SG) (Sutton, Biblarz 2001).
The geometric parameters of star grain, their effects on internal ballistics, and their future trends provide better understanding regarding star grain (Ricciardi 1992).
The traditional star grain and the proposed rose petal grain configuration appear in Fig.
Data for both configurations is R=5 mm, a =5 for the star grain configuration and R=5 mm, a =8 for the rose petal grain configuration.
It comes out that the port area of both configurations is nearly the same if we set n=8 for the rose petal and n=4 for star grain configuration.
Again for this case n is set as 7 for the rose petal grain configuration, and its value is 4 for the star grain configuration as depicted in Fig.
On the other hand, the star grain configuration curve does not fall to zero; the rose petal configuration curve has no tail-off, as opposed to its star counterpart.
From 1 to 2 msec, in the star grain configuration, the curve is constant, but for the rose petal grain configuration, the curve is little bit progressive; the values are nearly equal, however.
On the other hand the star grain configuration curve does not fall to zero.