TY  - JOUR
T1  - Pasif venturi aktüatörlü bir silindir etrafındaki akış: Reynolds sayısı ve hücum açısının etkileri
TT  - Flow past a cylinder with a passive venturi actuator: Effects of Reynolds number and angle of attack
AU  - Fırat, Erhan
AU  - Seyhan, Mehmet
PY  - 2025
DA  - June
Y2  - 2025
DO  - 10.17714/gumusfenbil.1474494
JF  - Gümüşhane Üniversitesi Fen Bilimleri Dergisi
PB  - Gümüşhane Üniversitesi
WT  - DergiPark
SN  - 2146-538X
SP  - 331
EP  - 348
VL  - 15
IS  - 2
LA  - tr
AB  - 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.
KW  - Akış kontrolü
KW  - Dairesel silindir
KW  - Direnç düşürme
KW  - Hesaplamalı akışkanlar dinamiği (HAD)
KW  - Pasif venturi aktuatorü (PVA)
KW  - Rüzgar tüneli
N2  - 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.
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UR  - https://doi.org/10.17714/gumusfenbil.1474494
L1  - https://dergipark.org.tr/tr/download/article-file/3889208
ER  -