COMPARATIVE STUDY ON THE INFLUENCE OF UNSTEADY AND UNIFORM MICRO TIP INJECTIONS ON THE STABILITY OF A LOW-SPEED COMPRESSOR
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2026
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| author | Liu, Zhuoqi Yan, Jiandong Yan, Zhaoqi Pan, Tianyu |
| author_facet | Liu, Zhuoqi Yan, Jiandong Yan, Zhaoqi Pan, Tianyu |
| contents | <p>Micro tip injection effectively improves stall margin with<br>minimal efficiency loss. This study compares uniform and<br>unsteady micro tip injections in a low-speed compressor to<br>reveal their effects on compressor stability. Numerical<br>simulations were performed on a 1/10th annular sector model.<br>Both injection methods have identical time-averaged mass flow,<br>0.005% of compressor’s design flow per actuator. The unsteady<br>micro tip injection (BPFI) operates at the blade passing<br>frequency using square waves, with each actuator featuring two<br>outlets in opposite phase, whereas the uniform injection (UI)<br>employs a steady single outlet. The resulting flow fields are<br>analyzed using dynamic mode decomposition (DMD). Results<br>show that BPFI improves stall margin by 1.31%, outperforming<br>the 0.71% achieved by UI. Due to the minimal momentum input<br>of both schemes, their impact on the radial load distribution is<br>negligible. DMD reveals that spillage vortex (SPV) dynamics<br>dominate tip flow instability: The cross-passage propagation of<br>SPV enhances leading-edge spillage and induces tornado<br>vortex formation, marking stall onset. UI injection mitigates<br>SPV by enhancing mid-chord leakage, wall shear, and<br>circumferential transport, thereby improving compressor stall<br>margin, which is a feature common to both injection schemes.<br>The critical blockage coefficient at stall onset remains<br>unchanged for either method. Due to its periodic nature, BPFI<br>further concentrates leakage enhancement and amplifies<br>leakage fluctuations, more effectively constraining SPV growth<br>and enhancing stability.</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_20013945 |
| institution | Zenodo |
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| publishDate | 2026 |
| publisher | Zenodo |
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| spellingShingle | COMPARATIVE STUDY ON THE INFLUENCE OF UNSTEADY AND UNIFORM MICRO TIP INJECTIONS ON THE STABILITY OF A LOW-SPEED COMPRESSOR Liu, Zhuoqi Yan, Jiandong Yan, Zhaoqi Pan, Tianyu Turbomachinery Propulsion Aeromechanics Compressors <p>Micro tip injection effectively improves stall margin with<br>minimal efficiency loss. This study compares uniform and<br>unsteady micro tip injections in a low-speed compressor to<br>reveal their effects on compressor stability. Numerical<br>simulations were performed on a 1/10th annular sector model.<br>Both injection methods have identical time-averaged mass flow,<br>0.005% of compressor’s design flow per actuator. The unsteady<br>micro tip injection (BPFI) operates at the blade passing<br>frequency using square waves, with each actuator featuring two<br>outlets in opposite phase, whereas the uniform injection (UI)<br>employs a steady single outlet. The resulting flow fields are<br>analyzed using dynamic mode decomposition (DMD). Results<br>show that BPFI improves stall margin by 1.31%, outperforming<br>the 0.71% achieved by UI. Due to the minimal momentum input<br>of both schemes, their impact on the radial load distribution is<br>negligible. DMD reveals that spillage vortex (SPV) dynamics<br>dominate tip flow instability: The cross-passage propagation of<br>SPV enhances leading-edge spillage and induces tornado<br>vortex formation, marking stall onset. UI injection mitigates<br>SPV by enhancing mid-chord leakage, wall shear, and<br>circumferential transport, thereby improving compressor stall<br>margin, which is a feature common to both injection schemes.<br>The critical blockage coefficient at stall onset remains<br>unchanged for either method. Due to its periodic nature, BPFI<br>further concentrates leakage enhancement and amplifies<br>leakage fluctuations, more effectively constraining SPV growth<br>and enhancing stability.</p> |
| title | COMPARATIVE STUDY ON THE INFLUENCE OF UNSTEADY AND UNIFORM MICRO TIP INJECTIONS ON THE STABILITY OF A LOW-SPEED COMPRESSOR |
| topic | Turbomachinery Propulsion Aeromechanics Compressors |
| url | https://doi.org/10.5281/zenodo.20013945 |