Numerical investigation of flow through a curved annular diffuser

Sinha, Prasanta Kumar; Mullick, A. N.; Halder, B.; Majumdar, B. C.

doi:10.1063/1.4704290

“…also increase in Reynolds number leads to increase in outlet pressure recovery for both types of diffuser under study. [22] investigated numerically and experimentally the flow through annular curved diffusers. They concluded that; the pressure coefficient increases sharply with area ratio and the standard k-ε model is the suitable one for simulation.…”

Section: ‫دراسات‬mentioning

confidence: 99%

Experimental and Numerical Studies on Water Flow Through Rectangular Cross-Sectional Area S-Shaped Diffusers

Ibrahim

¹

,

El‐Askary

²

,

Sakr

³

et al. 2015

ERJ. Engineering Research Journal

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The paper presents comprehensive experimental and numerical studies on water flow through rectangular S-shaped diffusers. The experimental setup was designed and constructed to perform the measurements which have been carried out on twelve models of S-shaped diffusers. The measurements of pressure distributions along the outer and inner walls of the S-shaped diffuser were performed for different parameters including area ratios, curvature ratios, inflow Reynolds numbers, turning angles (45 • /45 • , 60 • /60 • , 90 • /90 •), and flow paths (45 • /45 • , 60 • /30 • , 30 • /60 •). The energy-loss coefficients for each model are based on detailed measurements of the wall pressure distributions along walls of the S-shaped-diffuser models including long upstream and downstream tangents. The energy-loss coefficient data were plotted as a function of Reynolds number for the tested models at different geometrical parameters. The experimental data for different S-diffuser configurations have been used for assessing credibility of the numerical code using different turbulence models. High performances of computations with turbulence closure provided by

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“…also increase in Reynolds number leads to increase in outlet pressure recovery for both types of diffuser under study. Sinha and Majumdar [22] investigated numerically and experimentally the flow through annular curved diffusers. They concluded that; the pressure coefficient increases sharply with area ratio and the standard k-ε model is the suitable one for simulation.…”

Section: Introductionmentioning

confidence: 99%

Performance of S-Shaped Diffusers: Experimental and Numerical Studies

Sakr

¹

,

El‐Askary

²

,

Ibrahim

³

et al. 2017

International Conference on Aerospace Sciences and Aviation Tec

0

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The paper presents comprehensive experimental and numerical studies on water flow through rectangular S-shaped diffusers. The experimental setup was designed and constructed to perform the measurements which have been carried out on twelve models of Sshaped diffusers. The measurements of pressure distributions along the outer and inner walls of the S-shaped diffuser were performed for different parameters including area ratios, curvature ratios, inflow Reynolds numbers, turning angles (45/45, 60/60, 90/90), and flow paths (45/45, 60/30, 30/60). The energy-loss coefficients for each model are based on detailed measurements of the wall pressure distributions along walls of the S-shapeddiffuser models including long upstream and downstream tangents. The energy-loss coefficient data were plotted as a function of Reynolds number for the tested models at different geometrical parameters. The experimental data for different S-diffuser configurations have been used for assessing credibility of the numerical code using different turbulence models. High performances of computations with turbulence closure provided by the standard k-ε model have been carried out for prediction of the performance of S-diffusers at different inflow and geometrical conditions. The results showed that the diffuser energyloss coefficient is strongly affected by the geometrical parameters of S-shaped diffuser and inflow Reynolds number. Increasing area ratio, curvature ratio, and inflow Reynolds number increase the diffuser performance. The turning angle plays an important role in improving the S-shaped diffuser performance. But, the diffuser performance decreases, when the turning angle is larger than 60° and the flow path changes far than the symmetric path (45°/45°).

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