star grain

star grain

[′stär ‚grān]
(materials)
A rocket propellant grain with a cavity of star-shaped cross section.
References in periodicals archive ?
Figure 12(c) shows the transient contours of the star grain. Apparently, LSM degrades to the minimum distance method when Vn is uniform across the field.
Caption: Figure 10: Geometric parameters of star grain.
Equation (5) [30] describes the analytical solution of star grains, where L is the length of the grain, and other symbols are defined by Figure 10.
Canopus Star grain terminal in Romania's Constanta port will be expanded following a EUR 15 million investment made by Cargill together with Transport Trade Services (TTS), the local subsidiary of the US based agribusiness giant has announced.The investment will increase the terminal's operational capacity to 50,000 tons and its warehouse capacity to 110,000 tons and should be completed by 2014.Cargill has a strong presence in Romania which remains a country of strategic importance for the company, said Martin Schuldt, the president of the board of administration of Cargill Oils.
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.
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.
For star grain R=6 mm, a =12.5 and for rose petal grain R=6 mm, a =14.6.
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.