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to s t o r e the exhaust during the buttoned-up period. Enormous hardened underground chambers were required to permit prime-mover operation throughout the a t t a c k mode of operation. This closed method of operation was dis c a r d e d when i t was determined to be much more expensive than p a r t l y or f u l l y open a i r systems. COMPUTER MODELING AND SCALE- MODEL TESTING I t was not known whether the prime movers could accept shock waves without p h y s i c a l damage or l o s s of p r e c i s e power due to the compressor going i n t o surge because of the shock wave. I n i t i a l estimates of the response of prime movers to f r e e - f i e l d a i r b l a s t , dust, and a i r temperature i n d i c a t e d t h a t both peak i n t e n s i t i e s and the r a t e of i n c r e a s e needed to be attenuated. This was e s p e c i a l l y t r u e f o r the gas t u r b i n e . Reduction of the f r e e - f i e l d shock-wave peak overpressure by one-third to one-half and achievement of reasonably gradual pressure i n c r e a s e s were found to be f e a s i b l e by the use of plenum chambers together with small connecting passages. The theory of the response of a i r systems to n u c l e a r weapons e f f e c t s was developed and the theory was checked and aug- mented by thorough t e s t s under shock-wave c o n d i t i o n s . A r e s u l t a n t theory was programmed to allow computer s i m u l a t i o n of performance 20 21* of a wide range of f e a s i b l e a i r - s y s t e m arrangements ' * I t may be noted th a t t h i s computer program, used i n connection with prime-mover s t u d i e s , i s a p p l i c a b l e to c a l c u l a t i n g the response of almost any arrangement of ducting, chambers, and i n l e t s and o u t l e t s , thus being a p p l i c a b l e to s h e l t e r s of almost any type. -29-
