Flow past a cylinder with a passive venturi actuator: Effects of Reynolds number and angle of attack

Yıl 2025, Cilt: 15 Sayı: 2, 331 - 348, 15.06.2025

Erhan Fırat , Mehmet Seyhan

https://doi.org/10.17714/gumusfenbil.1474494

Öz

The main objective of this study is to investigate the effects of Reynolds number (Re) and angle of attack (α) on the aerodynamic characteristics of a cylinder with a recently developed flow control method, Passive Venturi Actuator (PVA). To this end, both aerodynamic force measurements and computational fluid dynamics (CFD) simulations have been carried out. The Reynolds numbers of the experimental study ranged from Re=28000 to 80000. The attack angles of the experimental study ranged from α=-30° to +30°. For the cylinder with and without PVA, CFD simulations were conducted at Re=36000 and α=0°. Findings based on using the force measurements showed a fairly linear relationship between the time-averaged drag coefficient, (C_D ) ̅, and Re. For α=0°, an increase in the Re from 28000 to 80000 resulted in a reduction in the (C_D ) ̅. The results demonstrate that regardless of the attack angle tested, the cylinder with PVA exhibits a lower (C_D ) ̅ compared to the cylinder without PVA. It has also been shown comparatively that PVA exhibits very good drag performance compared to passive control methods tested with it in a similar Re range.

Anahtar Kelimeler

Flow control , Circular cylinder , Drag reduction , Computational Fluid Dynamics (CFD) , Passive venturi actuator (PVA) , Wind tunnel

Pasif venturi aktüatörlü bir silindir etrafındaki akış: Reynolds sayısı ve hücum açısının etkileri

Öz

Bu çalışmanın temel amacı, Reynolds sayısı (Re) ve hücum açısının (α) yeni geliştirilen bir akış kontrol yöntemi olan Pasif Venturi Aktüatör’ünü (PVA) içeren bir silindirin aerodinamik karakteristikleri üzerindeki etkilerini araştırmaktır. Bu amaçla hem aerodinamik kuvvet ölçümleri hem de hesaplamalı akışkanlar dinamiği (HAD) benzetimleri gerçekleştirilmiştir. Deneysel çalışmanın Reynolds sayıları Re=28000 ile 80000 arasında değişmektedir. Deneysel çalışmanın hücum açıları α=-30° ile +30° arasında değişmektedir. PVA içeren ve içermeyen silindir için HAD benzetimleri Re=36000 ve α=0°’de gerçekleştirilmiştir. Kuvvet ölçümleri kullanılarak elde edilen bulgular, zaman ortalamalı direnç katsayısı (C_D ) ̅ ile Re arasında oldukça doğrusal bir ilişki olduğunu göstermiştir. α=0° için Re değerinin 28000’den 80000’e arttırılması (C_D ) ̅ değerinde bir düşüşe neden olmuştur. Sonuçlar, test edilen hücum açısı ne olursa olsun, PVA’lı silindirin PVA’sız silindire kıyasla daha düşük bir (C_D ) ̅ sergilediğini göstermektedir. Ayrıca PVA’nın benzer Re aralığında test edilen pasif kontrol yöntemlerine kıyasla çok iyi bir direnç performansı sergilediği de karşılaştırmalı olarak gösterilmiştir.

Anahtar Kelimeler

Akış kontrolü , Dairesel silindir , Direnç düşürme , Hesaplamalı akışkanlar dinamiği (HAD) , Pasif venturi aktuatorü (PVA) , Rüzgar tüneli

Etik Beyan

Bu makalenin yazarları, bu çalışmada kullanılan materyal ve yöntemlerin etik kurul izni ve yasal-özel izin gerektirmediğini beyan etmektedir.

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