By H. Tijdeman
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Additional resources for Investigations of the Transonic Flow Around Oscillating Airfoils
Example text
For t h e d e t a i l e d t e s t data, a collec- were s e l e c t e d i n such a way t h a t the C -H diagram t i o n o f t a b l e s w i t h steady and unsteady p r e s s u r e o f t h e a i r f o i l ( F i g . e. a 100. steady aerodynamic c h a r a c t e r i s t i c s c o u l d be obtained ( t a b l e &a). 2 NLR 7301 AIRFOIL were selected, f o r which e x t r a t e s t runs were con- ducted t o e x p l o r e t h e i n f l u e n c e o f a m p l i t u d e and The t e s t s on t h e NLR 7301 a i r f o i l t h a t c o u l d frequency o f o s c i l l a t i o n ( t a b l e 4 b ) .
1 2 . A normal t e s t r u n proceeds as f o l l o w s : a t a g i v e n t e s t c o n d i t i o n (Mach number, mean incidence, o r mean f l a p a n g l e ) , F i g . 10 t h e model i s f o r c e d i n t o a s i n u s o i d a l m o t i o n a t t h e d e s i r e d frequency and am- T e s t set-up for s t i l l - a i r c a l i b r a t i o n s . 0- *A--- I. - 200" i F i g . 11 Examples o f measured t r a n s f e r f u n c t i o n s i n s t i l l a i r and i n f l o w i n g a i r . M 1c), As a n e x t s t e p ( F i g . L Fig. 38 Single pressure-measuring system. Fig. 3b Tube with discontinuity in tube radius. t h e v e c t o r p i is decomposed i n a r e a l and an imaginary component r e l a t i v e t o t h e m o t i o n o f t h e model, which u s u a l l y i s measured by means o f a c c e l erometers or displacement pick-ups. In t h i s procedure, t h e a c c u r a t e d e t e r m i n a t i o n o f t h e t r a n s f e r f u n c t i o n s o f tube-transducer systems under the a c t u a l c o n d i t i o n s i n t h e wind tunnel i s one or more d i s c o n t i n u i t i e s i n tube diameter ( F i g .