Numerical prediction of turbulent flow in a conical diffuser usingk-ε model |
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Authors: | He Yongsen Toshio Kobayashi Youhei Morinishi |
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Institution: | (1) Changsha Institute of Mining Research, 410012 Changsha, China;(2) Institute of Industrial Science, University of Tokyo, Japan |
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Abstract: | Fully developed incompressible turbulent flow in a conical diffuser having a total divergence angle of 8° and an area ratio
of 4∶1 has been simulated by ak-ε turbulence model with high Reynolds number and adverse pressure gradient. The research has been done for pipe entry Reynolds
numbers of 1.16×105 and 2.93×105. The mean flow velocity and turbulence energy are predicted successfully and the advantage of Boundary Fit Coordinates approach
is discussed. Furthermore, thek-ε turbulence model is applied to a flow in a conical diffuser having a total divergence angle of 30° with a perforated screen.
A simplified mathematical model, where only the pressure drop is considered, has been used for describing the effect of the
perforated screen. The optimum combination of the resistance coefficient and the location of the perforated screen is predicted
for high diffuser efficiency or the uniform velocity distribution. |
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Keywords: | numerical simulation diffuser turbulent flow k-ε turbulence model HSMAC scheme BFC approach |
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