Supersonic and Hypersonic Minimum Drag for Bodies of Revolution

2003 ◽  
Author(s):  
Lamar Auman ◽  
Brett Wilks
Keyword(s):  
Bodies Of Revolution ◽  
Minimum Drag

Minimum drag and heating 0.3-caliber projectile nose geometry

2018 ◽  
Vol 233 (6) ◽  
pp. 1990-2000 ◽  
Author(s):  
Semih M Ölçmen ◽  
Gary C Cheng ◽  
Richard Branam ◽  
Stanley E Jones
Keyword(s):  
Heat Transfer ◽  
Body Temperature ◽  
Power Series ◽  
Aerodynamic Drag ◽  
Computational Study ◽  
Heat Transfer Characteristics ◽  
Bodies Of Revolution ◽  
Minimum Drag ◽  
Wide Range ◽  
Existing Data

Understanding the performance of penetrators and aerodynamic bodies of revolution (missiles, rockets, aircraft noses, etc.) requires a close look at the drag and the heat transfer characteristics at a wide range of supersonic flight conditions. This research utilizes computational study and compares the aerothermal loads of supersonic flows around a new penetrator geometry, derived based on the optimization of the nose factor, to those of other common projectile shapes: conical, tangent-ogive, and power series nose geometries. The abundance of research on 0.3-caliber projectile made the choice for this research simple in order to maximize our ability to compare to the existing data. The comparison of our 0.3 caliber cylindrical projectile with other geometries shows that within the range of 500–1500 m/s flight speed the new geometry has the lowest aerodynamic drag, lowest body temperature, and least amount of heating.

Hypersonic minimum-drag slender bodies of revolution.

AIAA Journal ◽  
1966 ◽  
Vol 4 (10) ◽  
pp. 1717-1724 ◽  
Author(s):  
MARTIN R. FINK
Keyword(s):  
Bodies Of Revolution ◽  
Minimum Drag ◽  
Slender Bodies

Unconditionally stable Laguerre-based BOR-FDTD scheme for scattering from bodies of revolution

2007 ◽  
Vol 49 (8) ◽  
pp. 1897-1900 ◽  
Author(s):  
Hai-Lin Chen ◽  
Bin Chen ◽  
Yan-Tao Duan ◽  
Yun Yi ◽  
Da-Gang Fang
Keyword(s):  
Bodies Of Revolution ◽  
Unconditionally Stable

scholarly journals Effect of Cutting Ratio and Catch on Drag Characteristics and Fluttering Motions of Midwater Trawl Codend

2021 ◽  
Vol 9 (3) ◽  
pp. 256
Author(s):  
Wei Liu ◽  
Hao Tang ◽  
Xinxing You ◽  
Shuchuang Dong ◽  
Liuxiong Xu ◽  
...  
Keyword(s):  
Drag Force ◽  
Mesh Size ◽  
Current Speed ◽  
Midwater Trawl ◽  
Minimum Drag ◽  
Fish Catch ◽  
Spatial Geometry ◽  
By Catch ◽  
Trawl Fisheries ◽  
Crucial Part

The codend of a trawl net is the rearmost and crucial part of the net for selective fish catch and juvenile escape. To ensure efficient and sustainable midwater trawl fisheries, it is essential to better understand the drag characteristics and fluttering motions of a midwater trawl codend. These are generally affected by catch, cutting ratio, mesh size, and twine diameter. In this study, six nylon codend models with different cutting ratios (no cutting, 6:1, 5:1, 4:1, 7:2, and 3:1) were designed and tested in a professional flume tank under two conditions (empty codends and codends with catch) and five current speeds to obtain the drag force, spatial geometry, and movement trend. As the cutting ratio of empty codends decreased, the drag force decreased, and the drag coefficient increased. The unfolding degree of codend netting and the height of empty codends were found to be directly proportional to the current speed and inversely proportional to the cutting ratio. The positional amplitude of codend with cutting ratio 4:1 was the smallest for catch. The drag force of codends with catch increased as the current speed increased, and first decreased and then increased as the cutting ratio decreased. To ensure the best stability and minimum drag force of the codend, it is recommended to use the 4:1 cutting ratio codend.

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