Effects of air blowing on turbulent flow over a circular cylinder

Buryan APACOGLU, (TOBB Ekonomi ve Teknoloji Üniversitesi, Makine Mühendisliği Bölümü, Ankara, Türkiye)
Akin PAKSOY, (TOBB Ekonomi ve Teknoloji Üniversitesi, Makine Mühendisliği Bölümü, Ankara, Türkiye)
Selin ARADAG (TOBB Ekonomi ve Teknoloji Üniversitesi, Makine Mühendisliği Bölümü, Ankara, Türkiye)
Isı Bilimi ve Tekniği Dergisi
3 1
Yıl: 2012 Cilt: 32 Sayı: 2 Sayfa Aralığı: 107 - 119 Metin Dili: Türkçe İndeks Tarihi: 29-07-2022

Effects of air blowing on turbulent flow over a circular cylinder

Öz:
Bu çalışmada, Reynolds sayısı 20,000 iken iki-boyutlu (2B) silindir üzerindeki türbülanslı akış ve silindir üzerine yerleştirilen deliklerden hava üfleme ile bu akışın kontrolü sayısal olarak incelenmektedir. Hesaplamalı Akışkanlar Dinamiği (HAD) benzetimlerinde Zamana-bağlı Reynolds-Ortalamalı Navier-Stokes (URANS) denklemleri ve Spalart-Allmaras türbülans modeli kullanılmıştır. Kontrolsüz akış benzetimleri literatürde yer alan sürükleme katsayısı, Strouhal sayısı, silindir üzerindeki ortalama basınç katsayısı dağılımı ve silindir arkası alandaki ortalama hız dağılımı ile doğrulanmıştır. Silindirin üzerine yerleştirilen deliklerden hava üflemenin eyleyici olarak kullanılmasıyla akış kontrolü gerçekleştirilmiştir. Silindirin yüzeyine yerleştirilen dört adet delikten akış hızının %50’si büyüklüğünde bir hızla hava üflenmesi ile kontrolsüz duruma kıyasla sürükleme katsayısında %23 azalma görülmüştür. Ayrıca, silindirin arkasındaki yakın alan, HAD analizleri sonucunda elde edilen veri topluluğuna Dikgen Ayrıştırma Yöntemi (DAY) uygulanması ile detaylı olarak incelenmiştir. 2B akışa Hızlı Fourier Dönüşümü (HFD) filtrelemeli olarak anlık durum-tabanlı DAY uygulanmasıyla kontrolsüz ve kontrollü akışlar için akışın toplam enerjisinin %99’u yalnızca en yüksek enerjiye sahip iki kip ile gösterilmiştir. Bu kiplerde von Karman girdap yolu düzgün bir biçimde görülmektedir.
Anahtar Kelime:

Konular: Termodinamik

Hava üflemenin dairesel silindir üzerindeki türbülanslı akışa etkileri

Öz:
This study analyzes the flow over a two-dimensional (2D) circular cylinder at a turbulent Reynolds number of 20,000 and its control by air blowing from several slots located on the surface of the cylinder, computationally. CFD simulations are performed by using Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations and Spalart-Allmaras turbulence model. Uncontrolled flow simulation results are validated using the experimental results available in literature for drag coefficient, Strouhal number, time-averaged pressure coefficient distribution on the circumference of the cylinder and mean velocity values at the downstream. Air blowing from several slots located on the cylinder is used as an actuator for forcing the flow. Blowing from four slots located on the circumference of the cylinder with a velocity magnitude of 50% of the free stream velocity yields a drag reduction of 23% compared to the uncontrolled case. Additionally, near wake region is further examined by application of Proper Orthogonal Decomposition (POD) technique. A Fast Fourier Transform (FFT) based spatial filtering procedure is employed in order to separate the effects of small-scale turbulent structures in the wake region. The FFT-filtered snapshot-based POD analysis shows that approximately 99% of the total energy of the flow can be represented by considering only the most energetic first two modes where the effects of von Karman vortex street can be seen appropriately both for uncontrolled and controlled flow cases.
Anahtar Kelime:

Konular: Termodinamik
Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık
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APA APACOGLU B, PAKSOY A, ARADAG S (2012). Effects of air blowing on turbulent flow over a circular cylinder. , 107 - 119.
Chicago APACOGLU Buryan,PAKSOY Akin,ARADAG Selin Effects of air blowing on turbulent flow over a circular cylinder. (2012): 107 - 119.
MLA APACOGLU Buryan,PAKSOY Akin,ARADAG Selin Effects of air blowing on turbulent flow over a circular cylinder. , 2012, ss.107 - 119.
AMA APACOGLU B,PAKSOY A,ARADAG S Effects of air blowing on turbulent flow over a circular cylinder. . 2012; 107 - 119.
Vancouver APACOGLU B,PAKSOY A,ARADAG S Effects of air blowing on turbulent flow over a circular cylinder. . 2012; 107 - 119.
IEEE APACOGLU B,PAKSOY A,ARADAG S "Effects of air blowing on turbulent flow over a circular cylinder." , ss.107 - 119, 2012.
ISNAD APACOGLU, Buryan vd. "Effects of air blowing on turbulent flow over a circular cylinder". (2012), 107-119.
APA APACOGLU B, PAKSOY A, ARADAG S (2012). Effects of air blowing on turbulent flow over a circular cylinder. Isı Bilimi ve Tekniği Dergisi, 32(2), 107 - 119.
Chicago APACOGLU Buryan,PAKSOY Akin,ARADAG Selin Effects of air blowing on turbulent flow over a circular cylinder. Isı Bilimi ve Tekniği Dergisi 32, no.2 (2012): 107 - 119.
MLA APACOGLU Buryan,PAKSOY Akin,ARADAG Selin Effects of air blowing on turbulent flow over a circular cylinder. Isı Bilimi ve Tekniği Dergisi, vol.32, no.2, 2012, ss.107 - 119.
AMA APACOGLU B,PAKSOY A,ARADAG S Effects of air blowing on turbulent flow over a circular cylinder. Isı Bilimi ve Tekniği Dergisi. 2012; 32(2): 107 - 119.
Vancouver APACOGLU B,PAKSOY A,ARADAG S Effects of air blowing on turbulent flow over a circular cylinder. Isı Bilimi ve Tekniği Dergisi. 2012; 32(2): 107 - 119.
IEEE APACOGLU B,PAKSOY A,ARADAG S "Effects of air blowing on turbulent flow over a circular cylinder." Isı Bilimi ve Tekniği Dergisi, 32, ss.107 - 119, 2012.
ISNAD APACOGLU, Buryan vd. "Effects of air blowing on turbulent flow over a circular cylinder". Isı Bilimi ve Tekniği Dergisi 32/2 (2012), 107-119.
Sayfa Oluşturulma Tarihi
17-04-2024 0:27

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