Experimental investigation of sound generation by a protuberance in a laminar boundary layer

2014 ◽  
Vol 26 (8) ◽  
pp. 084108 ◽  
Author(s):  
M. Kobayashi ◽  
M. Asai ◽  
A. Inasawa
Keyword(s):  
Boundary Layer ◽  
Experimental Investigation ◽  
Laminar Boundary Layer ◽  
Sound Generation

A Theoretical Investigation of the Maximum-Lift Coefficient

1935 ◽  
Vol 2 (1) ◽  
pp. A21-A27
Author(s):  
Th. von Kármán ◽  
Clark B. Millikan
Keyword(s):  
Boundary Layer ◽  
Experimental Investigation ◽  
Reynolds Number ◽  
Velocity Distribution ◽  
Theoretical Investigation ◽  
Laminar Boundary Layer ◽  
Lift Coefficient ◽  
Boundary Layer Theory ◽  
First Approximation ◽  
Transition Points

Abstract In the present paper the application of a laminar boundary-layer theory, previously developed by the authors, to the problem of the maximum-lift coefficient of airfoils is discussed. The calculations are carried through in detail for a first approximation, called a single-roof profile, to the potential velocity distribution over the upper surface of an airfoil. The results indicate a large variation in Clmax with turbulence but the quantitative dependence on Reynolds’ number and turbulence is not satisfactory. The calculations are then repeated for a so-called double-roof profile which approximates to the flow over the upper surface of an N.A.C.A. 2412 airfoil. These results are compared with those obtained from an experimental investigation on the same airfoil. The agreement is considered to indicate that for moderate values of R and Clmax the phenomenon of the maximum-lift coefficient is controlled by a contest between the separation and transition points of the laminar boundary layer over the nose of the airfoil. The difficulties involved in extending the theory to larger values of R, or to airfoils whose Cl vs. α curves are not approximately linear up to the stall, are mentioned.

Experimental investigation of flame spreading over pure methane hydrate in a laminar boundary layer

2013 ◽  
Vol 34 (2) ◽  
pp. 2131-2138 ◽  
Author(s):  
Yoshihiro Maruyama ◽  
Masaru Joe Fuse ◽  
Takeshi Yokomori ◽  
Ryo Ohmura ◽  
Shigeru Watanabe ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Experimental Investigation ◽  
Laminar Boundary Layer ◽  
Methane Hydrate ◽  
Flame Spreading ◽  
Pure Methane
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