Near field dynamics of subsonic free square jets. A computational and experimental study

1995 ◽  
Vol 7 (6) ◽  
pp. 1483-1497 ◽  
Author(s):  
F. F. Grinstein ◽  
E. Gutmark ◽  
T. Parr
Keyword(s):  
Experimental Study ◽  
Near Field ◽  
Square Jets

Experimental study of near-field light collection efficiency of aperture fiber probe at near-infrared wavelengths

2011 ◽  
Vol 50 (29) ◽  
pp. 5710 ◽  
Author(s):  
Nobuhiro Tsumori ◽  
Motoki Takahashi ◽  
Yoshiki Sakuma ◽  
Toshiharu Saiki
Keyword(s):  
Experimental Study ◽  
Near Infrared ◽  
Collection Efficiency ◽  
Near Field ◽  
Light Collection ◽  
Fiber Probe ◽  
Infrared Wavelengths

Polarization effects in apertureless scanning near-field optical microscopy:?an experimental study

1999 ◽  
Vol 24 (4) ◽  
pp. 187 ◽  
Author(s):  
L. Aigouy ◽  
A. Lahrech ◽  
S. Grésillon ◽  
H. Cory ◽  
A. C. Boccara ◽  
...  
Keyword(s):  
Experimental Study ◽  
Optical Microscopy ◽  
Near Field ◽  
Polarization Effects

Effect of Nozzle Geometry on the Near-Field Flow Characteristics of High-Pressure Gas Leak Jets

2018 ◽  
Author(s):  
Xiaopeng Li ◽  
Fakun Zhuang ◽  
Rui Zhou ◽  
Yian Wang ◽  
Libo Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
Nozzle Exit ◽  
Flow Behavior ◽  
Near Field ◽  
Pressure Ratio ◽  
Three Dimensional ◽  
Major Axis ◽  
Minor Axis ◽  
Nozzle Geometry ◽  
Square Jets

Three-dimensional large eddy simulations of high-pressure jets at the same nozzle pressure ratio of 5.60 but issuing from different nozzles are conducted. Four different nozzle geometries, i.e., the circular, elliptic, square, and rectangular nozzles, are used to investigate the effect of the nozzle geometry on the near-field jet flow behavior. A high-resolution, hexahedral, and block-structured grid containing about 31.8 million computational cells is applied. The compressible flow solver, astroFoam, which is developed based on the OpenFOAM C++ library, is used to perform the simulations. The time-averaged near-field shock structures and the mean axial density are compared with the experiment data to validate the fidelity of the LES results, and the reasonable agreement is observed. The results indicate that the remarkable differences exist in the near-field flow structures of the jets. In particular, the circular and square jets correspond to a three-dimensional helical instability mode, while the elliptic and rectangular jets have a two-dimensional lateral instability in their minor axis planes. A subsonic flow zone exists after the Mach disk in the circular and square jets, but is lacking in the elliptic and rectangular jets. The intercepting shocks in the circular jet originate near the nozzle exit, and appear to be circular in cross-section. The intercepting shocks in the square jet originate at the four corners of the nozzle exit at first, and then are observed along the major axis plane some distance downstream of the nozzle exit. However, the formation of the intercepting shock is observed in the major axis planes but is lacking in the minor axis planes for the elliptic and rectangular jets. In addition, the real mass flow rates and discharge coefficients for different jets are computed based on the LES modeling, and their differences are explored.

Experimental Study on the Damage of Steel Tubular Structural Components by Near-Field Detonations

2020 ◽  
Author(s):  
Wanyue Wang ◽  
Shaobo Geng ◽  
Hua Wang ◽  
Wenqiang Li ◽  
Yaling Liu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Near Field ◽  
Structural Components
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