Performance comparison analysis of flattened Whitcomb winglet using computational fluid dynamics

2021 ◽  
Author(s):  
S. A. Munthahar ◽  
D. Alfarisy ◽  
R. Stevenson ◽  
M. J. Ramadhani ◽  
E. Amalia
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Performance Comparison ◽  
Comparison Analysis

Performance Comparison of Modified Offset Strip Fins Using a CFD Analysis

2016 ◽  
Vol 24 (03) ◽  
pp. 1650015 ◽  
Author(s):  
Seongwon Hwang ◽  
Ji Hwan Jeong
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Heat Exchangers ◽  
Performance Comparison ◽  
Vortex Generators ◽  
Cfd Analysis ◽  
Design Modification ◽  
F Factor ◽  
Computational Fluid Dynamics Cfd ◽  
Goodness Factor

Offset strip fins (OSF) have been widely used in plate-fin heat exchangers. Conventional OSFs are constructed with plain fins. Various design modifications to improve the performance of OSFs are compared here. The modifications suggested include perforations, dimples, vortex generators, and a double-layer design. The performance capabilities are evaluated using a computational fluid dynamics (CFD) analysis. The performances are compared in terms of the j-factor, f-factor, area goodness factor, and volume goodness factor. The f-factors of all modified designs appeared to be higher than that of the plain OSF, while the j-factor was found to be higher or lower than that of the plain OSF depending on the design modification used. The plain OSF has the largest area goodness factor, while OSFs with multiple perforations and dimples show a higher volume goodness factor than the plain OSF.

A 3D Computational Fluid Dynamics Analysis of the Wells Turbine

2002 ◽  
Author(s):  
John Daly ◽  
Elvis Sheik Bajeet ◽  
Ajit Thakker ◽  
Patrick Frawley
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Reynolds Numbers ◽  
Performance Comparison ◽  
Low Flow ◽  
Wells Turbine ◽  
Computational Fluid Dynamics Analysis ◽  
Computational Fluid Dynamics Cfd ◽  
Bladed Rotor ◽  
Overall Performance

This paper deals with the application of Computational Fluid Dynamics (CFD) to the performance comparison of some proposed blade designs for the Well’s Turbine. The turbines were modelled at typical Reynolds numbers for full scale rigs and the results were found to correlate well with scale predictions from experimental data. Three different turbine designs were analysed, one a 4-bladed rotor and the other two 8-bladed rotors. The only difference between the two 8-bladed rotors was the addition of forward sweep to one. The addition of forward sweep was shown to have little effect on the overall performance of the 8-bladed rotor. The 4-bladed rotor was shown to have the highest efficiency and pressure drop at low flow rates, however it was also shown to have a much smaller operating range than the 8-bladed rotors.

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