TABLE 5 - CORRELATION BETWEEN AMPLIFICATION 

 FACTORS AND MEASURED TRANSITION DATA 



Amplification 

 Factor 



Model 3 



Model 4 



Model 6 



Model 8 





22 < R D • 1CT 5 <35, 



20 < R D • 10~ 5 <35, 



18< R D • 10~ 5 < 32, 



5< R D • 10" 5 <32, 





fully turbulent 



fully turbulent 



between turbulent 



fully turbulent 



e 13 



5< R D • 10~ 5 <22, 



Probably fully turbulent at 



and intermittent 







nearly fully turbulent 



all values of R D tested 



5< R D • 10" 5 < 18, 

 intermittent 







27 < R D • 10" 5 < 35, 



20 < R D • 10- 5 < 35, 



9< R D • 10"" 5 <32, 



5< R D • 10" 5 < 32, 





fully turbulent 



fully turbulent 



intermittent 



fully turbulent 



11 

 e 



13 < R D • 10" 5 <27, 

 intermittent 



5< R D • 10" 5 < 13, 



wavelike 





5< R D • 10~ 5 <9, 



wavelike 







20 < R D • 1CT 5 < 22, 



26 < R D ■ 10~ 5 < 35, 



24 < R D • 10" 5 < 32, 



5< R D • 10~ 5 < 32, 





intermittent 



fully turbulent 



between intermittent 



fully turbulent 



e 9 



5< R D • 10" 5 < 20, 



18 < R D • 10~ 5 < 26, 



and wavelike 



Close to intermittent 





wavelike 



intermittent 



5< R D • 10~ 5 < 24, 



wavelike 



at R D = 12 





10 < R D • 10" 5 < 20, 



30 < R D • 10~ 5 < 35, 



5< R D • 10" 5 <32, 



5< R D ■ 10~ 5 < 32, 





wavelike 



intermittent 



wavelike 



intermittent 



e 7 



5< R D • 10~ 5 < 10, 



15 < R D • 10" 5 < 30, 









laminar 



wavelike 



5< R D • 10" 5 < 15, 



laminar 









R D • 10" 5 = 10, wavelike 



10 < R D • 10~ 5 < 23, 



23 < R D ■ 10' 5 < 32, 



5< R D • 10~ 5 < 11, 





5< P D • 10" s < 10, 



laminar 



probably wavelike 



wavelike 



e 5 



laminar 



Probably laminar at all 



5< R D • 10" 5 < 23, 







Probably wavelike in range 



values of R D tested 



laminar 







given by 10 < R D • 1 0~ 5 < 35 











Probably laminar at all 



6< R D • 10~ 5 < 16, 



5< R D • 10~ 5 < 12, 



5< R D • 10" 5 < 8, 



e 3 



values of R D tested 



laminar 



laminar 



laminar 







Probably laminar at all 



Probably laminar at all 



Probably laminar at all 







values of R D tested 



values of R D tested 



values of R D tested 



At Reynolds numbers less than 1.0 • 10 7 , the spread of the data becomes much larger. This 

 results primarily from the greater inaccuracy involved in measuring low drags in the low-speed 

 range. Figures 14a through 14j give the values of the measured C T , both with and without a 

 turbulence stimulator installed for the nine models. 



As stated previously, the analysis method described in Reference 1 was used to compute 

 the values of C R . Ideally, C R 's obtained from experiments with both tripped and untripped 

 models should be equal when this method is used. However, an inspection of Figure 1 3 shows 

 that a small difference of as much as 0.03 • 10~ 3 between the tripped and untripped values 

 of C R can be discerned for roughly one-third to one-half of the model data. 



17 



