Experimental investigation of ice accretion on rotorcraft airfoils at high speeds

1984 ◽  
Author(s):  
R. FLEMMING ◽  
D. LEDNICER
Keyword(s):  
Experimental Investigation ◽  
Ice Accretion ◽  
High Speeds

Experimental Investigation of Film Thickness Behaviour at Very High Speeds

2008 ◽  
Author(s):  
Joslyn Hili ◽  
Andrew V. Olver ◽  
Simon Edwards ◽  
Leon Jacobs
Keyword(s):  
Experimental Investigation ◽  
Film Thickness ◽  
Viscous Dissipation ◽  
Frictional Heating ◽  
Magnetic Method ◽  
Regression Equations ◽  
High Speeds ◽  
Tractive Rolling ◽  
Shear Heating ◽  
Very High

At very high speeds, elastohydrodynamic (EHD) films may be considerably thinner than is predicted by classical isothermal regression equations such as that due to Hamrock and Dowson. This may arise because of viscous dissipation, frictional heating or starvation. In this paper, the contact between a steel ball and a glass disc was studied. The disc was driven at speeds of up to 20 ms−1, and the ball was driven by tractive rolling against the disc, its speed being determined using a magnetic method. It is shown that the results, which fall well below classical predictions, are consistent with inlet shear heating at the observed sliding speeds.

scholarly journals Numerical and Experimental Investigation of Wiper System Performance at High Speeds

2017 ◽  
Vol 10 (3) ◽  
pp. 861-870 ◽  
Author(s):  
S. Cadirci ◽  
E. S. Ak ◽  
B. Selenbas ◽  
H. Gunes ◽  
◽  
...  
Keyword(s):  
Experimental Investigation ◽  
System Performance ◽  
High Speeds

A Study of the Micro-End Milling of Titanium Alloy

2011 ◽  
Vol 325 ◽  
pp. 588-593 ◽  
Author(s):  
Koji Tsuda ◽  
Koichi Okuda ◽  
Hiroo Shizuka ◽  
Masayuki Nunobiki
Keyword(s):  
Surface Roughness ◽  
Experimental Investigation ◽  
Tool Wear ◽  
End Milling ◽  
Cutting Speed ◽  
Small Diameter ◽  
End Mill ◽  
High Speeds ◽  
Micro End Mill ◽  
Micro End Milling

This study deals with the cutting characteristics of titanium materials when milled by a small-diameter end mill, or a micro end mill. It is well known that titanium is difficult to cut by conventional means. However, its cutting characteristics have not yet been made sufficiently clear in cases where a micro end mill less than 1 mm in diameter is used. This study chiefly involves the experimental investigation of tool wear and surface roughness of micro-end milling of Ti-6Al-4V. The findings were that tool wear did not increase much when the cutting speed was increased from 50 m/min to 200 m/min. Furthermore, the cutting force required to cut decreased at high speeds and during wet cutting. In wet cutting, the surface had a roughness (Rz) of only 0.3 μm at 200 m/min in contrast to 0.6 μm at 50 m/min.

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