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Comparison investigation of axial flow compressors with and without shrouded stators |
| LI Xiang, GU Chunwei |
| Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China |
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Abstract The stator design was changed from shrouded to unshrouded for the Tsinghua 1.5-stage transonic axial flow compressor test rig to study whether the unshrouded stator met the design requirements. Both shrouded and unshrouded configurations were simulated using CFD, with the influence of the stator gap size also investigated. The results show that the efficiency is 1.8% higher at the design point and the stall margin increases by 1.5% for the compressor with the unshrouded stator. The leakage flow and endwall secondary flow are balanced at a smaller gap, but the clearance flow tends to be dominant near the endwall at a larger gap, e.g. 0.8 mm. Therefore, the gap size should strictly be controlled in the manufacturing process.
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| Keywords
transonic axial flow compressor
shrouded stator
unshrouded/cantilevered stator
numerical simulation
secondary flow
leakage flow
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Issue Date: 15 December 2015
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2015,
Vol. 55
