Experimental investigation on axial velocity distribution for ship’s twin-propeller jets

2017 ◽  
Vol 40 (3) ◽  
pp. 191-199 ◽  
Author(s):  
Wan-Tian Yew ◽  
Roslan Hashim ◽  
Khai-Ching Ng
Keyword(s):  
Experimental Investigation ◽  
Velocity Distribution ◽  
Axial Velocity ◽  
Axial Velocity Distribution

scholarly journals Collisionless ion modeling in Hall thrusters: Analytical axial velocity distribution function and heat flux closures

2020 ◽  
Vol 27 (7) ◽  
pp. 073506
Author(s):  
S. Boccelli ◽  
T. Charoy ◽  
A. Alvarez Laguna ◽  
P. Chabert ◽  
A. Bourdon ◽  
...  
Keyword(s):  
Heat Flux ◽  
Distribution Function ◽  
Velocity Distribution ◽  
Axial Velocity ◽  
Velocity Distribution Function ◽  
Hall Thrusters ◽  
Axial Velocity Distribution

The Combined Effect of Axial Velocity Density Ratio and Aspect Ratio on Compressor Cascade Performance

1981 ◽  
Vol 103 (1) ◽  
pp. 247-255 ◽  
Author(s):  
U. Stark ◽  
H. Hoheisel
Keyword(s):  
Aspect Ratio ◽  
Velocity Distribution ◽  
Axial Velocity ◽  
Density Ratio ◽  
Combined Effect ◽  
Experimental Investigations ◽  
Compressor Cascade ◽  
Pressure Distributions ◽  
Contraction Ratio ◽  
Axial Velocity Distribution

The paper describes theoretical and experimental investigations on the combined effect of axial velocity density ratio (AVDR) and aspect ratio (AR) on compressor cascade performance in incompressible and compressible flow. The results presented demonstrate that it is the aspect ratio that defines the axial velocity distribution through the cascade at a given wall shape and contraction ratio. It is further shown that it is, in turn, the axial velocity distribution that decisively determines the local values of pressure distributions as well as the cascade overall parameters like turning angles and loss coefficients.

scholarly journals The Combined Effect of Axial Velocity Density Ratio and Aspect Ratio on Compressor Cascade Performance

1980 ◽  
Author(s):  
U. Stark ◽  
H. Hoheisel
Keyword(s):  
Aspect Ratio ◽  
Velocity Distribution ◽  
Axial Velocity ◽  
Density Ratio ◽  
Combined Effect ◽  
Experimental Investigations ◽  
Compressor Cascade ◽  
Pressure Distributions ◽  
Contraction Ratio ◽  
Axial Velocity Distribution

The paper describes theoretical and experimental investigations on the combined effect of axial velocity density ratio (AVDR) and aspect ratio (AR) on compressor cascade performance in incompressible and compressible flow. The results presented demonstrate that it is the aspect ratio that defines the axial velocity distribution through the cascade at a given wall shape and contraction ratio. It is further shown that it is, in turn, the axial velocity distribution that decisively determines the local values of pressure distributions as well as the cascade overall parameters like turning angles and loss coefficients.

scholarly journals Development of vortex model with realistic axial velocity distribution

2014 ◽  
Vol 80 (818) ◽  
pp. FE0299-FE0299 ◽  
Author(s):  
Kei ITO ◽  
Toshiki EZURE ◽  
Hiroyuki OHSHIMA
Keyword(s):  
Velocity Distribution ◽  
Axial Velocity ◽  
Vortex Model ◽  
Axial Velocity Distribution

A Theory for Flow with Axial Symmetry in Centrifugal Impellers

1960 ◽  
Vol 11 (1) ◽  
pp. 22-40
Author(s):  
R. J. Tonks ◽  
A. G. Smith
Keyword(s):  
Velocity Distribution ◽  
Theoretical Calculation ◽  
Centrifugal Compressor ◽  
Incompressible Flow ◽  
Axial Symmetry ◽  
Axial Velocity ◽  
Axial Velocity Distribution ◽  
Flow Through ◽  
Good Agreement

SummaryA theory of incompressible flow with axial symmetry through the impeller of a centrifugal compressor is given more fully and more accurately that by previous writers. The theory is applied to compute the flow through two different impellers. For each design the experimental axial velocity distribution at the impeller eye is in good agreement with that computed numerically from the theory. This means that for the impeller assembly—not untypical of modern designs—considered here, theoretical calculation of intake axial velocity should provide a useful guide to designers.

Analysis of inlet flow passage conditions and their influence on the performance of an axial-flow pump

2020 ◽  
pp. 095765092095747
Author(s):  
Wenpeng Zhang ◽  
Lijian Shi ◽  
Fangping Tang ◽  
Xiaohui Duan ◽  
Haiyu Liu ◽  
...  
Keyword(s):  
Velocity Distribution ◽  
Axial Velocity ◽  
Axial Flow ◽  
Hydraulic Loss ◽  
Flow Conditions ◽  
Inlet Flow ◽  
Axial Velocity Distribution ◽  
Distribution Uniformity ◽  
Axial Flow Pump ◽  
Flow Pump

The inlet flow conditions will directly affect impeller performance, which is of great concern to pump designers. In this study, based on two axial-flow pump devices, the influence of the evaluation criteria of inlet flow conditions and numerical grid scales on the accuracy of the simulation are investigated, the correctness of the numerical simulation are verified by experiments. The axial velocity distribution uniformity, axial velocity weighted average angle and hydraulic loss are calculated with three grid scales commonly used in engineering. The applicability of three turbulence models in engineering is verified. The influence of the uniformity of the axial velocity distribution on the impeller is quantitatively explored by installing a group of vortex generators. The results show that the simulation errors of the common formula of the axial velocity distribution uniformity for the elbow inlet passage and front-shaft tubular inlet passage are 16.3% and 14.6%, respectively; the modified formula limited the computational error to 0.2%, which reduced the axial velocity distribution uniformity dependence on the grid. The quantitative relationship between inlet flow conditions and pump performance was established, as the impeller efficiency decreased linearly with decreasing axial velocity distribution uniformity.

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