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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Additional info for VAPORIZATION OF RADIOISOTOPE FUELS IN LAUNCH VEHICLE ABORT FIRES
Example text
3 ) ) . This f a c t o r i s almost independent of f i r e b a l l p r o p e r t i e s and i s p l o t t e d a s a f u n c t i o n o f p a r t i c l e d i a m e t e r i n F i g . 8, where t h e r e l a - t i v e velocity v has been assumed t o be equal t o t h e t e r m i n a l f a l l v e l o c i t y . For a given p a r t i c l e s i z e and a given p r o p e l l a n t i n v e n t o r y , t h e s e t h r e e q u a n t i t i e s can b e r e a d from F i g s . 6-8, a r d t h e f r a c t i o n vaporized is t h e n g i v e n by The c u r v e s i n F i g s .
The v a l u e of Y f o r Pu9 v a s ta,ken t o be 525 dynes/cm. 2 The t h e o r y a l s o g i v e s an e s t i m a t e o f t h e i n i t i a l r a d i l l r r 0 (5) or t h e r e s u l t i n g p a r t i c l e s , which i s 56 d i F i g u r e 16. RELATIVE SCAVENGING EFF 3 W e i g h t c o n c e n t r a t i o n of i n a c t i v e p a r t i c l e s ( g / c m ) r e q u i r e d t o n s c a v e n g e l l a d i l u t e 2 3 8 P u 0 2 v a p o r at a g i v e n r a t e , i l l u s t r a t i n g t h e r a p i d l y d e c r e a s i n g s c a v e n g i n g e f f i c i e n c y with i n c r e a s i n g p a r t i c l e s i z e ( s e e text).
0 2 em; t h e r e d u c t i o n f a c t o r should be s e t e q u a l t o u n i t y Tor t h e s e p a r t i c l e s . E due t o convection, i . e . , ( 3 ) There w i l l be an enhancement f a c t o r - t h e r e l a t i v e motion o f t h e p a r t i c l e and t h e f i r e b a l l gases ( b r a c k e t e d t e r m i n Equation ( 2 . 3 ) ) . This f a c t o r i s almost independent of f i r e b a l l p r o p e r t i e s and i s p l o t t e d a s a f u n c t i o n o f p a r t i c l e d i a m e t e r i n F i g .