scholarly journals Geometry dependence of the fluctuation intensity in gyrokinetic turbulence

2020 ◽  
Vol 63 (1) ◽  
pp. 015013
Author(s):  
G M Staebler ◽  
J Candy ◽  
E A Belli ◽  
J E Kinsey ◽  
N Bonanomi ◽  
...  
Keyword(s):  
Fluctuation Intensity ◽  
Geometry Dependence

scholarly journals Phase Distribution in the Tip Clearance of a Multiphase Pump at Multiple Operating Points and Its Effect on the Pressure Fluctuation Intensity

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 556
Author(s):  
Guangtai Shi ◽  
Zongku Liu ◽  
Xiaobing Liu ◽  
Yexiang Xiao ◽  
Xuelin Tang
Keyword(s):  
Phase Velocity ◽  
Pressure Fluctuation ◽  
Phase Distribution ◽  
Tip Clearance ◽  
Tip Leakage Flow ◽  
Two Phase ◽  
Multiphase Pump ◽  
Fluctuation Intensity ◽  
Operating Points ◽  
Multiple Operating Points

Tip clearance has a great effect on the flow and pressure fluctuation characteristics in a multiphase pump, especially at multiple operating points. The phase distribution and pressure fluctuation in tip clearance in a multiphase pump are revealed using the CFD (computational fluid dynamics) technology and high-speed photography methods. In this paper, the phase distribution, the gas-liquid two-phase velocity slip, and the pressure fluctuation intensity are comprehensively analyzed. Results show with the increase of the tip clearance, the multiphase pump pressurization performance is obviously deteriorated. In the meantime, the gas accumulation mainly occurs at the hub, the blade suction side (SS), and the tip clearance, and the maximum gas-liquid two-phase velocity difference is near the impeller streamwise of 0.4. In addition, the tip clearance improves the gas-liquid two-phase distribution in the pump, that is, the larger the tip clearance is, the more uniform the gas-liquid distribution becomes. Furthermore, the gas leads to the maximum pressure fluctuation intensity in the tip clearance which is closer to the tip leakage flow (TLF) outlet, and has a greater effect on the degree of flow separation in the tip clearance.

Geometry dependence of the proton affinities in the electronic ground, excited triplet and ionized doublet states of H2CO and H2COH+

1982 ◽  
Vol 89 (3-4) ◽  
pp. 235-245 ◽  
Author(s):  
Otto P. Strausz ◽  
Ede Kapuy ◽  
Cornelia Kozmutza ◽  
Michael A. Robb ◽  
Imre G. Csizmadia
Keyword(s):  
Proton Affinities ◽  
Excited Triplet ◽  
Geometry Dependence ◽  
Electronic Ground

scholarly journals Geometry dependence of field enhancement in 2D metallic photonic crystals

2009 ◽  
Vol 17 (24) ◽  
pp. 22179 ◽  
Author(s):  
Hari P. Paudel ◽  
Khadijeh Bayat ◽  
Mahdi Farrokh Baroughi ◽  
Stanley May ◽  
David W. Galipeau
Keyword(s):  
Photonic Crystals ◽  
Field Enhancement ◽  
Geometry Dependence ◽  
Metallic Photonic Crystals

On the geometry dependence of molecular dimer spectra with an application to aggregates of perylene bisimide

2006 ◽  
Vol 328 (1-3) ◽  
pp. 354-362 ◽  
Author(s):  
J. Seibt ◽  
P. Marquetand ◽  
Volker Engel ◽  
Z. Chen ◽  
V. Dehm ◽  
...  
Keyword(s):  
Perylene Bisimide ◽  
Geometry Dependence

ChemInform Abstract: Geometry Dependence of Intramolecular Photoinduced Electron Transfer in Synthetic Zinc-Ferric Hybrid Diporphyrins.

ChemInform ◽  
1990 ◽  
Vol 21 (39) ◽  
Author(s):  
A. OSUKA ◽  
K. MARUYAMA ◽  
N. MATAGA ◽  
T. ASAHI ◽  
I. YAMAZAKI ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Geometry Dependence

scholarly journals Feature of Echo Envelope Fluctuation and Its Application in the Discrimination of Underwater Real Echo and Synthetic Echo

2018 ◽  
Vol 8 (8) ◽  
pp. 1329
Author(s):  
Yunfei Chen ◽  
Sheng Li ◽  
Bing Jia ◽  
Guijuan Li ◽  
Zhenshan Wang
Keyword(s):  
Physical Parameters ◽  
Scaled Model ◽  
Theoretical Simulation ◽  
Active Sonar ◽  
Fluctuation Intensity ◽  
Characterization Model ◽  
Novel Method ◽  
Underwater Target ◽  
Echo Features ◽  
Synthetic Target

Discriminating a real underwater target echo from a synthetic echo is a key challenge to identifying an underwater target. The structure of an echo envelope contains information which closely relates to the physical parameters of the underwater target, and the characterization and extraction of echo features are problematic issues for active sonar target classification. In this study, firstly, the high-frequency envelope fluctuation of a complex underwater target echo was analyzed, the envelope fluctuation was characterized by the envelope fluctuation intensity, and a characterization model was established. The features of a benchmark model echo were extracted and analyzed by theoretical simulation and sea testing of a scaled model, and the result shows that the envelope fluctuation intensity varies with carrier frequency and azimuth of incident signal, but the echo envelope fluctuation of the synthetic target echo does not present these features. Then, based on the characteristics of echo envelope fluctuation, a novel method was developed for active sonar discrimination of a real underwater target echo from the synthetic echo. Through a sea experiment, the real target echo and synthetic echo were classified by their different echo envelope fluctuations, and the feasibility of the method was verified.

Sign in / Sign up

Export Citation Format

Share Document