Yahya Erkan AKANSU, Mehmet SEYHAN, Mustafa SARIOĞLU

Ayırıcı Plakalı Bir Kare Prizma Etrafındaki Akışta Hücum Açısının Etkisi

Farklı hücum açılarında akış ayırıcı plakalı bir kare prizmaya etki eden kaldırma ve sürükleme kuvvetleri yük hücresiyle ölçülerek deneysel olarak incelenmiştir. Sonuçlar, kaldırma ve sürükleme katsayılarının Re = 9700 – 36500 aralığında 0°, 45°, 90°, 135° ve 180° hücum açıları için Reynolds sayısından bağımsız olduğunu göstermiştir. Sürükleme katsayısı 0 hücum açısında tek kare prizma için 2.02 ve ayırıcı plakalı kare durumunda ise 1.04 olarak elde edilmiştir. Plakalı kare için maksimum sürükleme katsayısındaki azalma 50% olarak 0 ve 15’de elde edilmiştir. α 114° aralıkları için, plakalı karenin sürükleme katsayısı sade karenin sürükleme katsayısından küçüktür. Re = 20000’de, kaldırma ve sürükleme katsayılarının önemli derecede hücum açısına bağlı olarak değiştiği görülmüştür.

EFFECT OF ATTACK ANGLE ON FLOW AROUND A SQUARE PRISM WITH A SPLITTER PLATE

Lift and drag forces on a square prism with a (splitter) plate are experimentally investigated byforce measurements with a load cell. Results showed that drag and lift coefficients are independent ofReynolds number for Re = 9700 – 36500 at 0°, 45°, 90°, 135° and 180°. Drag coefficient at 0 is obtainedas 2.02 for the square prism alone, and 1.04 for the square cylinder with splitter plate. Maximum dragreduction for the square cylinder with the plate is 50% as compared to the square cylinder at 0 and 15.For α < 30° and α > 114°, drag coefficient of a square prism with splitter plate is smaller than that of thesquare prism alone. At Re = 20000, lift and drag coefficients significantly change with increasing attackangle

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