VAPORIZATION OF RADIOISOTOPE FUELS IN LAUNCH VEHICLE ABORT by Williams, D.C.; Sandia Laboratories.; Sandia National

By Williams, D.C.; Sandia Laboratories.; Sandia National Laboratories.; United States. Dept. of Energy. Office of Scientific and Technical Information

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V a p o r i z a t i o n w a s also c a l c u l a t e d f o r an i n t a c t SSC o r PMC d i s k a s a f u n c t i o n of t i m e i n t h e f i r e , u s i n g t h e approximations d i s c u s s e d i n S e c t i o n s I1 and 111. The d i s k was assuned t o b e a t a t e n p e r a t u r e of 1 0 3 3 ° K when released t o t h e f i r e . R e s u l t s a r e p l o t t e d i n F i g . 11. The v a p o r i z a t i o n becomes l a r g e o n l y i f t h e a d i a b a t i c model i s assumed. So f a r , t h e d u r a t i o n o f exposure t o t h e f i r e h a s been t r e a t e d a s a n a r b i t r a r y parameter f o r p a r t i c l e s of a l l s i z e s .

Above, hecone quite i m p r t a n t for the larger particle sizes. 30 TABLE 3 . 2 Approximate f r a c t i o n a l v a p o r i z a t i o n f o r v a r i o u s parameter v a l u e s , as e s t i m a t e d from t h e g e n e r a l i z e d model 31 IV. c S o l i d P r o p e l l a n__--_-t Pad A b s r t s l_l_l Tile a b x t o f a s o l i d p r o p e l l a n t v e h i c l e does not produce a f i r e b a l l of l a r g e volune, as i n t h e c a s e o€ a l i q u i d - p r o p e l l a n t b o o s t e r .

L ( t h e s i z e of t h e p i e c e o f The v a l u e of - b u r n i n g p r o p e l l a n t ) w a s s e t e q u a l t o one m e t e r . 09 em a r e removed from t h e f i r e , and t h a t t h e s n a l l e r t h e y are, t h e m x e r a p i d l y t h e y are removed. 01 em) blow o f f so r a p i d l y t h a t , even f o r t h e s e , t h e r m a l lag e f f e c t s may n o t b e n e g l i g i b l e , u n l i k e t h e c a s e f o r liquid- propellant f i r e b a l l s . 4), because h e a t conduction from t h e surround- i n g gases, and n o t r a d i a t i o n , i s p r o b a b l y t h e predominmt mode o f h e a t t r a n s - f e r f o r v e r y snall p a r t i c l e s (Appendix B ) .

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