1409 Experimental study on the effect of aspect ratio on the pressure oscillation in supersonic rectangular-cavity flows

2014 ◽  
Vol 2014 (0) ◽  
pp. _1409-1_-_1409-2_
Author(s):  
Taro Handa ◽  
Yusuke Kihara ◽  
Shinji Maruyama
Keyword(s):  
Experimental Study ◽  
Aspect Ratio ◽  
Pressure Oscillation ◽  
Rectangular Cavity ◽  
Cavity Flows

Experimental Investigation of Aspect-Ratio Effects in Transonic Rectangular Cavity Flows

2014 ◽  
Author(s):  
Justin L. Wagner ◽  
Steven J. Beresh ◽  
Katya M. Casper ◽  
Brian Pruett ◽  
Russell Spillers ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Aspect Ratio ◽  
Rectangular Cavity ◽  
Cavity Flows

Effect of yaw on pressure oscillation frequency within rectangular cavity at Mach 2

AIAA Journal ◽  
1997 ◽  
Vol 35 ◽  
pp. 1233-1235 ◽  
Author(s):  
Peter J. Disimile ◽  
Paul D. Orkwis
Keyword(s):  
Oscillation Frequency ◽  
Pressure Oscillation ◽  
Rectangular Cavity

Experimental Study of CD Variation With Aspect Ratio

1999 ◽  
Author(s):  
Jack Williams ◽  
Jewel Barlow ◽  
Robert Ranzenbach
Keyword(s):  
Experimental Study ◽  
Aspect Ratio

NUMERICAL AND EXPERIMENTAL STUDY ON FREE VIBRATION OF DELAMINATED WOVEN FIBER GLASS/EPOXY COMPOSITE PLATES

2012 ◽  
Vol 12 (02) ◽  
pp. 377-394 ◽  
Author(s):  
J. MOHANTY ◽  
S. K. SAHU ◽  
P. K. PARHI
Keyword(s):  
Experimental Study ◽  
Aspect Ratio ◽  
Free Vibration ◽  
Boundary Conditions ◽  
Natural Frequencies ◽  
Numerical Study ◽  
Shear Deformation Theory ◽  
Composite Plates ◽  
Fiber Glass ◽  
Number Of Layers

This paper presents a combined experimental and numerical study of free vibration of industry-driven woven fiber glass/epoxy (G/E) composite plates with delamination. Using the first-order shear deformation theory, an eight-noded two-dimensional quadratic isoparametric element was developed, which has five degrees of freedom per node. In the experimental study, the influence of various parameters such as the delamination size, boundary conditions, fiber orientations, number of layers, and aspect ratio on the natural frequencies of delaminated composite plates are investigated. Comparison of the numerical results with experimental ones shows good agreement. Fundamental natural frequencies are found to decrease with the increase in the delamination size and fiber orientation and increases with the increase in the number of layers and aspect ratio of delaminated composite plates. The natural frequency of the delaminated composite plate varies significantly for different boundary conditions.

Yacht Keels - An Experimental Study

1975 ◽  
Author(s):  
Pierre DeSaix
Keyword(s):  
Experimental Study ◽  
Aspect Ratio ◽  
Center Of Gravity ◽  
Full Scale ◽  
Optimum Size ◽  
Hull Form ◽  
Size And Shape ◽  
Aspect Ratios ◽  
Current Design ◽  
Lateral Area

Model tests are presented for a series of nine keels; three aspect ratios, three sweep angles; all at constant lateral area, taper ratio and thickness ratio. The series is shown to bracket current design trends. These keels are all tested on the same canoe body, over a range of heel angles, lee-ways, and speeds. The results are presented in terms of full-scale sailing performance with due allowance for a reasonable ballast ratio and resulting vertical center of gravity for each keel. Optimum sweep angles for each aspect ratio are found. A second series of three keels, geometrically similar but varying in lateral area, is provided. Predictions of windward performance demonstrate the effect of keel size. An optimum size is found for three wind strengths. The results are for one hull form only. However, a method is suggested for estimating the effect of keel size and shape for any proposed design.

High-Speed Visualization of the Oscillatory Supersonic Flow Over a Rectangular Cavity

2011 ◽  
Author(s):  
Taro Handa ◽  
Hiroaki Miyachi ◽  
Hatsuki Kakuno ◽  
Takaya Ozaki
Keyword(s):  
Supersonic Flow ◽  
Pressure Wave ◽  
High Speed ◽  
Pressure Oscillation ◽  
Rectangular Cavity ◽  
Schlieren Method ◽  
Trailing Edge ◽  
The Relationship ◽  
Type Pressure ◽  
Semiconductor Type

A mechanism of cavity-induced pressure oscillation in supersonic flows is not well understood in spite of a lot of former investigations. Especially, the process by which the pressure wave is generated and the path of the pressure wave propagating inside the cavity remain unclear. In order to clarify these, the oscillatory behaviors in the supersonic flow over a rectangular cavity are visualized by the schlieren method with a high-speed camera in the present study. The inlet Mach number of the flow is 1.68. The length and depth of the cavity are 14.0mm and 11.7mm respectively; i.e., the length-to-depth ratio of the cavity is 1.20. The pressure oscillation near the trailing edge of the cavity is also measured by use of the semiconductor-type pressure transducer simultaneously with the visualization. As a result, the pressure waves propagating inside as well as outside the cavity are successfully visualized. In addition, the relationship between the shear layer displacement, pressure wave generation and pressure oscillation at the trailing edge of the cavity are clarified experimentally.

Analytical, numerical and experimental study of the acoustic behavior of a rectangular cavity with absorbing treatment on a wall

1997 ◽  
Author(s):  
Mohamed Hamdi ◽  
Christian Glandier ◽  
Carole Floc'h ◽  
Mohamed Hamdi ◽  
Christian Glandier ◽  
...  
Keyword(s):  
Experimental Study ◽  
Rectangular Cavity ◽  
Acoustic Behavior

A Theoretical and Experimental Study on the Planform of Superventilated Wings

1974 ◽  
Vol 18 (03) ◽  
pp. 169-184
Author(s):  
L. F. Tsen ◽  
M. Guilbaud
Keyword(s):  
Experimental Study ◽  
Aspect Ratio ◽  
Numerical Method ◽  
Lower Surface ◽  
Cavitation Number ◽  
Water Tunnel ◽  
Surface Theory ◽  
Lifting Surface ◽  
Measured Force

This study explores the influence of the aspect ratio, the taper ratio, and the sweepback on the flow over trapezoidal superventilated wings with a flat wetted lower surface. The flow is first calculated by a numerical method in the scope of the linearized supercavitating lifting-surface theory. The calculated wings are then made and tested in a water tunnel at zero cavitation number. The measured force and moment coefficients are compared with the prediction.

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