I tiakina i:
| Ngā kaituhi matua: | , , , , |
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| Hōputu: | Recurso digital |
| Reo: | |
| I whakaputaina: |
Zenodo
2026
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| Ngā marau: | |
| Urunga tuihono: | https://doi.org/10.5281/zenodo.20003737 |
| Ngā Tūtohu: |
Tāpirihia he Tūtohu
Kāore He Tūtohu, Me noho koe te mea tuatahi ki te tūtohu i tēnei pūkete!
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Rārangi ihirangi:
- <p>The paper reports on a redesign of a test rig for investigation<br>of flutter of turbomachinery blades in high-speed airflow,<br>together with the first experimental results. The test section,<br>mounted in the high-speed wind tunnel, consists of a linear<br>cascade of five prismatic blades. A new mechanism was<br>developed and tested, allowing controlled kinematic excitation<br>of three middle blades with a continuously adjustable interblade<br>phase angle (IBPA). The experimental setup is equipped with a<br>laser triangulation sensor measuring the blade oscillation,<br>unsteady pressure probes in the blade suction surface, straingauge<br>bridges on the blade shafts monitoring the total torque<br>and a schlieren optical setup with high-speed camera for<br>visualization of the flow field around the middle blade. The<br>measured data were analyzed for inlet Mach number of 1.09,<br>frequency of blade oscillation of 150 Hz and interblade phase<br>angles ranging from –90 deg to 180 deg. The pressure oscillation<br>amplitude along the blade reached its maximum for<br>IBPA = -90 deg at 40% of the chord length, and its minimum for<br>IBPA = +45 deg. Among all measured cases, the most distinct<br>behavior was observed when the blades oscillated out of phase<br>(IBPA=180 deg). In this condition, the normal shock on the<br>pressure surface oscillated strongly from a point far downstream<br>up to the leading edge, and the total torque exhibited the highest<br>peak value.</p>