Effect of Partial Span Aspiration on the Performance of a Transonic Axial Compressor Rotor: A Numerical Study
Aspiration in an axial compressor is normally regarded as sucking out the low momentum boundary layer from blade suction surface, thus lowering the chances of flow separation and consequently that of stall under off-design operation. However, the suction mass flow does not take part in useful work a...
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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/10.1155/2015/761918 |
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| author | Vijaykumar Jain Quamber H. Nagpurwala Abdul Nassar |
| author_facet | Vijaykumar Jain Quamber H. Nagpurwala Abdul Nassar |
| author_sort | Vijaykumar Jain |
| collection | DOAJ |
| description | Aspiration in an axial compressor is normally regarded as sucking out the low momentum boundary layer from blade suction surface, thus lowering the chances of flow separation and consequently that of stall under off-design operation. However, the suction mass flow does not take part in useful work and leads to loss of engine power output. This paper deals with a new concept of natural aspiration to energize blade suction surface boundary layer by injecting some fluid from pressure to suction side through a part span slot on the blade. The energized boundary layer has lesser tendency to separate, thus enhancing stall margin. Numerical simulations were carried out to study the effect of aspiration slot location and geometry on the performance and stall margin of a transonic axial compressor rotor. The computational results without aspiration slot were in fair agreement with the published experimental data. The modified rotor, with part span aspiration, showed ~3.2% improvement in stall margin at design rotational speed. The pressure ratio and efficiency of the aspirated rotor dropped by ~1.42% and ~2.0%, respectively, whereas the structural analysis did not indicate any adverse effect on the blade stress distribution in the presence of aspiration slot. |
| format | Article |
| id | doaj-art-b7bc715bb2dd4a3e978d5a2400bd29b4 |
| 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-b7bc715bb2dd4a3e978d5a2400bd29b42025-02-03T07:25:04ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342015-01-01201510.1155/2015/761918761918Effect of Partial Span Aspiration on the Performance of a Transonic Axial Compressor Rotor: A Numerical StudyVijaykumar Jain0Quamber H. Nagpurwala1Abdul Nassar2GE Energy, Bangalore 560066, IndiaDepartment of Automotive and Aeronautical Engineering, Faculty of Engineering and Technology, M.S. Ramaiah University of Applied Sciences, Bangalore 560058, IndiaSoftInWay Turbomachinery Solutions Pvt. Ltd., Bangalore 560052, IndiaAspiration in an axial compressor is normally regarded as sucking out the low momentum boundary layer from blade suction surface, thus lowering the chances of flow separation and consequently that of stall under off-design operation. However, the suction mass flow does not take part in useful work and leads to loss of engine power output. This paper deals with a new concept of natural aspiration to energize blade suction surface boundary layer by injecting some fluid from pressure to suction side through a part span slot on the blade. The energized boundary layer has lesser tendency to separate, thus enhancing stall margin. Numerical simulations were carried out to study the effect of aspiration slot location and geometry on the performance and stall margin of a transonic axial compressor rotor. The computational results without aspiration slot were in fair agreement with the published experimental data. The modified rotor, with part span aspiration, showed ~3.2% improvement in stall margin at design rotational speed. The pressure ratio and efficiency of the aspirated rotor dropped by ~1.42% and ~2.0%, respectively, whereas the structural analysis did not indicate any adverse effect on the blade stress distribution in the presence of aspiration slot.http://dx.doi.org/10.1155/2015/761918 |
| spellingShingle | Vijaykumar Jain Quamber H. Nagpurwala Abdul Nassar Effect of Partial Span Aspiration on the Performance of a Transonic Axial Compressor Rotor: A Numerical Study International Journal of Rotating Machinery |
| title | Effect of Partial Span Aspiration on the Performance of a Transonic Axial Compressor Rotor: A Numerical Study |
| title_full | Effect of Partial Span Aspiration on the Performance of a Transonic Axial Compressor Rotor: A Numerical Study |
| title_fullStr | Effect of Partial Span Aspiration on the Performance of a Transonic Axial Compressor Rotor: A Numerical Study |
| title_full_unstemmed | Effect of Partial Span Aspiration on the Performance of a Transonic Axial Compressor Rotor: A Numerical Study |
| title_short | Effect of Partial Span Aspiration on the Performance of a Transonic Axial Compressor Rotor: A Numerical Study |
| title_sort | effect of partial span aspiration on the performance of a transonic axial compressor rotor a numerical study |
| url | http://dx.doi.org/10.1155/2015/761918 |
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