Comparison investigation of axial flow compressors with and without shrouded stators

LI Xiang; GU Chunwei

doi:10.16511/j.cnki.qhdxxb.2015.23.001

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Journal of Tsinghua University(Science and Technology) ›› 2015, Vol. 55 ›› Issue (12) : 1361-1366. DOI: 10.16511/j.cnki.qhdxxb.2015.23.001

THERMAL ENGINEERING

Comparison investigation of axial flow compressors with and without shrouded stators

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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.

Key words

transonic axial flow compressor / shrouded stator / unshrouded/cantilevered stator / numerical simulation / secondary flow / leakage flow

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LI Xiang, GU Chunwei. Comparison investigation of axial flow compressors with and without shrouded stators[J]. Journal of Tsinghua University(Science and Technology). 2015, 55(12): 1361-1366 https://doi.org/10.16511/j.cnki.qhdxxb.2015.23.001

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