Free-Stream Characteristics of A Family of Low-Aspect-Ratio, All-Movable Control Surfaces for Application to Ship Design

1958 ◽  
Author(s):  
L. F. Whicker ◽  
Leo F. Fehlner
Keyword(s):  
Aspect Ratio ◽  
Free Stream ◽  
Ship Design ◽  
Low Aspect Ratio ◽  
Stream Characteristics ◽  
Control Surfaces

A Method of Predicting the Effect of the Dissolved Gas Content of Water on Cavitation Inception

1984 ◽  
Vol 198 (3) ◽  
pp. 163-166 ◽  
Author(s):  
P Naylor ◽  
A Millward
Keyword(s):  
Aspect Ratio ◽  
Free Stream ◽  
Tip Vortex ◽  
Gas Content ◽  
Dissolved Gas ◽  
Cavitation Inception ◽  
Low Aspect Ratio ◽  
Good Agreement

A technique has been developed which allows the effect on the cavitation inception number of the gas content in the water to be predicted in cavitation experiments. The predicted results have been compared with data obtained during experiments to measure cavitation inception in the tip vortex of a low aspect ratio hydrofoil and have shown good agreement. The results showed that the gas content affected the cavitation inception number significantly at low free stream speeds, particularly below about 4 m/s.

Hydroelastic Instability of Low Aspect Ratio Control Surfaces

2004 ◽  
Vol 126 (1) ◽  
pp. 84-89 ◽  
Author(s):  
Michael E. McCormick ◽  
Luca Caracoglia
Keyword(s):  
Aspect Ratio ◽  
Special Class ◽  
Three Dimensional ◽  
Added Mass ◽  
Experimental Results ◽  
Low Aspect Ratio ◽  
Dimensional Effects ◽  
Aspect Ratios ◽  
Modified Equations ◽  
Control Surfaces

As the operational speeds of surface ships and submarines increase, so does the probability that unwanted vibrations caused by the hydroelastic instability (flutter) of the special class of hydrofoils called control surfaces. These include rudders and diving planes. By nature, these are thick symmetric hydrofoils having low aspect ratios. The 3-D tip effects become more pronounced as the aspect ratio decreases. In the present study, the added-mass and circulation terms of the 2-D flutter equations are modified to include three-dimensional effects. The modifications are performed by introducing quasi-steady coefficients to each term. The results predicted by the modified equations are found to compare well with experimental results on a towed rectangular foil having an aspect ratio of one.

Development of an Ion Beam Probe System for Potential Measurement in the Low Aspect-Ratio Torus Experiment Device

2012 ◽  
Vol 132 (7) ◽  
pp. 567-573
Author(s):  
Hitoshi Tanaka ◽  
Shota Omi ◽  
Jun Katsuma ◽  
Yurie Yamamoto ◽  
Masaki Uchida ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Ion Beam ◽  
Potential Measurement ◽  
Low Aspect Ratio ◽  
Probe System ◽  
Experiment Device
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