Old Dominion U n i v e r s i t y N o r f o l k , VA 23529-0247 USA ABSTRACT A s t u d y of boundary l a y e r f l o w regimes on a NACA 0012 a i r f o i l from zero a n g l e o f a t t a c k up t o s e p a r a t i o n i s presented. The boundary l a y e r t r a n s i t i o n from t h e l a m i n a r t o t h e t u r b u l e n t regime and t h e onset o f t h e s e p a r a t i o n were d e t e c t e d by s u r f a c e thermography o f t h e a i r f o i l performed w i t h an i n f r a r e d imaging system. The f i n d i n g s were compared a g a i n s t o b s e r v a t i o n s o f aluminum f o i l t u f t s " v i s i b l e " w i t h t h e i n f r a r e d imaging system. T h i s arrangement a l l o w s t h e i n f r a r e d imaging system t o assume t h e d u a l r o l e o f f l o w regime d e t e c t i o n t h r o u g h s u r f a c e thermography and f l o w v i s u a l i z a t i o n t h r o u g h t h e o b s e r v a t i o n o f t h e aluminum f o i l t u f t s . U l t i m a t e l y t h e temperature h i s t o r y on an uncontaminated surface w i l l p r o v i d e an i n t e r p r e t a t i o n o f t h e s t a t e o f boundary l a y e r f l o w .
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