Effect of the Radial Pressure Gradient on the Secondary Flow Generated in an Annular Turbine Cascade
This paper introduces an investigation of the effect of radial pressure gradient on the secondary flow generated in turbine cascades. Laboratory measurements were performed using an annular sector cascade which allowed the investigation using relatively small number of blades. The flow was measured...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/2012/509209 |
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| _version_ | 1832563488397983744 |
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| author | Hesham M. El-Batsh |
| author_facet | Hesham M. El-Batsh |
| author_sort | Hesham M. El-Batsh |
| collection | DOAJ |
| description | This paper introduces an investigation of the effect of radial pressure gradient on the secondary flow generated in turbine cascades. Laboratory measurements were performed using an annular sector cascade which allowed the investigation using relatively small number of blades. The flow was measured upstream and downstream of the cascade using a calibrated five-hole pressure probe. The three-dimensional Reynolds Averaged Navier Stokes equations were solved to understand flow physics. Turbulence was modeled using eddy-viscosity assumption and the two-equation Shear Stress Transport (SST) k-ω model. The results obtained through this study showed that the secondary flow is significantly affected by the pressure gradient along blade span. The experimental measurements and the numerical calculations predicted passage vortex near blade hub which had larger and stronger values than that predicted near blade tip. The loss distribution revealed that secondary flow loss was concentrated near blade hub. It is recommended that attempts of reducing secondary flow in annular cascade should put emphasis on the passage vortex near the hub. |
| format | Article |
| id | doaj-art-55c0c0aee1b94cd99bbaca4d9e8e1976 |
| institution | Kabale University |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-55c0c0aee1b94cd99bbaca4d9e8e19762025-02-03T01:20:04ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342012-01-01201210.1155/2012/509209509209Effect of the Radial Pressure Gradient on the Secondary Flow Generated in an Annular Turbine CascadeHesham M. El-Batsh0Mechanical Engineering Department, Benha Faculty of Engineering, Benha University, Benha 13512, EgyptThis paper introduces an investigation of the effect of radial pressure gradient on the secondary flow generated in turbine cascades. Laboratory measurements were performed using an annular sector cascade which allowed the investigation using relatively small number of blades. The flow was measured upstream and downstream of the cascade using a calibrated five-hole pressure probe. The three-dimensional Reynolds Averaged Navier Stokes equations were solved to understand flow physics. Turbulence was modeled using eddy-viscosity assumption and the two-equation Shear Stress Transport (SST) k-ω model. The results obtained through this study showed that the secondary flow is significantly affected by the pressure gradient along blade span. The experimental measurements and the numerical calculations predicted passage vortex near blade hub which had larger and stronger values than that predicted near blade tip. The loss distribution revealed that secondary flow loss was concentrated near blade hub. It is recommended that attempts of reducing secondary flow in annular cascade should put emphasis on the passage vortex near the hub.http://dx.doi.org/10.1155/2012/509209 |
| spellingShingle | Hesham M. El-Batsh Effect of the Radial Pressure Gradient on the Secondary Flow Generated in an Annular Turbine Cascade International Journal of Rotating Machinery |
| title | Effect of the Radial Pressure Gradient on the Secondary Flow Generated in an Annular Turbine Cascade |
| title_full | Effect of the Radial Pressure Gradient on the Secondary Flow Generated in an Annular Turbine Cascade |
| title_fullStr | Effect of the Radial Pressure Gradient on the Secondary Flow Generated in an Annular Turbine Cascade |
| title_full_unstemmed | Effect of the Radial Pressure Gradient on the Secondary Flow Generated in an Annular Turbine Cascade |
| title_short | Effect of the Radial Pressure Gradient on the Secondary Flow Generated in an Annular Turbine Cascade |
| title_sort | effect of the radial pressure gradient on the secondary flow generated in an annular turbine cascade |
| url | http://dx.doi.org/10.1155/2012/509209 |
| work_keys_str_mv | AT heshammelbatsh effectoftheradialpressuregradientonthesecondaryflowgeneratedinanannularturbinecascade |