FLOW INDUCED VIBRATION IN SQUARE CYLINDER OF VARIOUS ANGLES OF ATTACK

Nur Ain Shafiza Ramzi; Kee Quen Lee; NUR AMIRA BALQIS  MOHD ZAINURI; HOOI SIANG  KANG; NOR’AZIZI  OTHMAN; KENG YINN  WONG

doi:10.31436/iiumej.v23i1.1804

Authors

Nur Ain Shafiza Ramzi Universiti Teknologi Malaysia Kuala Lumpur https://orcid.org/0000-0002-9196-9575
Kee Quen Lee Malaysia-Japan International Institute of Technology
Nur Amira Balqis Mohd Zainuri Malaysia-Japan International Institute of Technology
Hooi-Siang Kang Universiti Teknologi Malaysia https://orcid.org/0000-0002-0292-4376
Nor’Azizi Othman Malaysia-Japan International Institute of Technology
Keng Yinn Wong Universiti Teknologi Malaysia

DOI:

https://doi.org/10.31436/iiumej.v23i1.1804

Keywords:

Flow induced vibration, square cylinder, galloping, angle of attack, tranquil zone

Abstract

An experimental study was carried out to identify the effect of angle of attack on flow-induced vibration (FIV) of square cylinders. The experiment was conducted at the Aeronautical and Wind Engineering Laboratory (AEROLAB), UTM Kuala Lumpur using a wind tunnel that was free from external wind conditions. A supporting structure was designed and fabricated to conduct this experiment. The importance of this support structure was to enable the rigid cylinder to suspend and vibrate freely upon excitation of wind speed. The results were analysed through the response of amplitude and frequency of the rigid cylinder over a velocity range of 0.5m/s to 4.0m/s. The results showed that for a square cylinder of ?=0°, vortex-induced vibration (VIV) occurred at low reduced velocity (U_R) in range of 5 ? U_R ? 10 and galloping occurred at higher reduced velocity which started at U_R=15. A tranquil zone was found between VIV and galloping in the reduced velocity range of 10 ? U_R ? 15. As for ?=22.5° and 45°, only VIV response was found at low reduced velocity in range of 4? U_R ? 9.

ABSTRAK: Satu kajian eksperimentasi telah dilakukan bagi mengenal pasti pengaruh sudut serangan oleh getaran cetusan-aliran (FIV) dalam silinder persegi. Eksperimen ini dijalankan di Makmal Kejuruteraan Aeronautika dan Angin (AEROLAB), UTM Kuala Lumpur dengan menggunakan terowong angin yang bebas dari pengaruh angin luar. Struktur sokongan telah direka dan difabrikasi bagi tujuan eksperimen ini. Ini penting bagi membolehkan silinder pegun tergantung dan bergetar dengan bebas semasa ujian kelajuan angin. Dapatan kajian dianalisis melalui tindak balas amplitud dan frekuensi silinder pegun pada kadar halaju 0.5m/s sehingga 4.0m/s. Hasil kajian menunjukkan bahawa bagi silinder persegi ? = 0 °, getaran pengaruh-vorteks (VIV) berlaku pada halaju rendah (U_R) dalam julat 5 ? U_R ? 10 dan getaran lebih teruk telah ketara berlaku pada kadar halaju berkurang iaitu bermula pada U_R = 15. Zon tenang dijumpai antara VIV dan getaran teruk pada kadar halaju berkurang 10 ? U_R ? 15. Adapun pada ? = 22.5° dan 45°, hanya tindak balas VIV dijumpai pada halaju rendah dalam kadar 4? U_R ? 9.

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Author Biographies

Nur Ain Shafiza Ramzi, Universiti Teknologi Malaysia Kuala Lumpur

Mechanical Precision Engineering, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia Kuala Lumpur, Malaysia, Mphil

Kee Quen Lee, Malaysia-Japan International Institute of Technology

Mechanical Precision Engineering, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia Kuala Lumpur, Malaysia, Senior Lecturer

Hooi-Siang Kang, Universiti Teknologi Malaysia

Marine Technology Center, Institute for Vehicle System and Engineering, Universiti Teknologi Malaysia, Malaysia, Senior lecturer

Nor’Azizi Othman, Malaysia-Japan International Institute of Technology

Mechanical Precision Engineering, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia Kuala Lumpur, Malaysia, Senior lecturer

Keng Yinn Wong, Universiti Teknologi Malaysia

School of Mechanical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Malaysia

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