Conjugate Heat Transfer Study of Combined Impingement and Showerhead Film Cooling Near NGV Leading Edge
A computational and experimental study is carried out on the leading edge region of a typical gas turbine NGV, cooled by a combination of impingement and showerhead film cooling. A detailed flow and conjugate heat transfer study has revealed the complex flow structure owing to the coolant-mainstream...
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/2015/315036 |
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| author | Dileep Chandran Bhamidi Prasad |
| author_facet | Dileep Chandran Bhamidi Prasad |
| author_sort | Dileep Chandran |
| collection | DOAJ |
| description | A computational and experimental study is carried out on the leading edge region of a typical gas turbine NGV, cooled by a combination of impingement and showerhead film cooling. A detailed flow and conjugate heat transfer study has revealed the complex flow structure owing to the coolant-mainstream interaction and the influence of vane material thermal conductivity. The local effectiveness values obtained by the computations agreed well with the experimental data from IR thermography. The effect of blowing ratio on the overall effectiveness is found to be strongly dependent on the vane material conductivity. The effect of blowing ratio is also found to be different towards the pressure and suction sides of the stagnation region. However, the overall effectiveness is found to decrease by about 12% and 6% for low and high conducting materials, respectively, with an increase in mainstream Reynolds number from Re=4.8×105 to 14.4×105. |
| format | Article |
| id | doaj-art-a57cbfce015141aa97dd4ae3e5eb1f76 |
| institution | Kabale University |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-a57cbfce015141aa97dd4ae3e5eb1f762025-08-20T03:38:30ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342015-01-01201510.1155/2015/315036315036Conjugate Heat Transfer Study of Combined Impingement and Showerhead Film Cooling Near NGV Leading EdgeDileep Chandran0Bhamidi Prasad1Thermal Turbomachines Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, IndiaThermal Turbomachines Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, IndiaA computational and experimental study is carried out on the leading edge region of a typical gas turbine NGV, cooled by a combination of impingement and showerhead film cooling. A detailed flow and conjugate heat transfer study has revealed the complex flow structure owing to the coolant-mainstream interaction and the influence of vane material thermal conductivity. The local effectiveness values obtained by the computations agreed well with the experimental data from IR thermography. The effect of blowing ratio on the overall effectiveness is found to be strongly dependent on the vane material conductivity. The effect of blowing ratio is also found to be different towards the pressure and suction sides of the stagnation region. However, the overall effectiveness is found to decrease by about 12% and 6% for low and high conducting materials, respectively, with an increase in mainstream Reynolds number from Re=4.8×105 to 14.4×105.http://dx.doi.org/10.1155/2015/315036 |
| spellingShingle | Dileep Chandran Bhamidi Prasad Conjugate Heat Transfer Study of Combined Impingement and Showerhead Film Cooling Near NGV Leading Edge International Journal of Rotating Machinery |
| title | Conjugate Heat Transfer Study of Combined Impingement and Showerhead Film Cooling Near NGV Leading Edge |
| title_full | Conjugate Heat Transfer Study of Combined Impingement and Showerhead Film Cooling Near NGV Leading Edge |
| title_fullStr | Conjugate Heat Transfer Study of Combined Impingement and Showerhead Film Cooling Near NGV Leading Edge |
| title_full_unstemmed | Conjugate Heat Transfer Study of Combined Impingement and Showerhead Film Cooling Near NGV Leading Edge |
| title_short | Conjugate Heat Transfer Study of Combined Impingement and Showerhead Film Cooling Near NGV Leading Edge |
| title_sort | conjugate heat transfer study of combined impingement and showerhead film cooling near ngv leading edge |
| url | http://dx.doi.org/10.1155/2015/315036 |
| work_keys_str_mv | AT dileepchandran conjugateheattransferstudyofcombinedimpingementandshowerheadfilmcoolingnearngvleadingedge AT bhamidiprasad conjugateheattransferstudyofcombinedimpingementandshowerheadfilmcoolingnearngvleadingedge |