Studi Numerik Aliran Melalui Square Duct Dan Square Elbow 90 Derajat Dengan Single Guide Vane Pada Variasi Bukaan Damper

Instalasi sistem perpipaan yang disebut fitting (aksesoris), yang mempunyai koefisien losses (headloss total) dan menyebabkan pressure drop (ΔP) sepanjang aliran. Aliran yang mengalir pada elbow mengalami kerugian gesekan (friction loss) dan terbentuknya aliran sekunder (secondary flow). Seperti halnya pada aliran yang mengalir dalam pipa lurus yang mengalami kerugian separasi (separation loss). Model penelitian dalam studi numerik ini berupa square ducting terdiri upstream straight channel yang tersambung square elbow 900. Pada bagian setelah elbow 900 terdapat downstream straight channel sepanjang x/Dh=18 dengan damper yang terletak di dalamnya sepanjang x/Dh=2. Fluida kerja penelitian adalah udara yang mengalir secara steady, incompressible fluid, fully develop dan mempunyai kondisi aliran uniform disisi inlet dengan Re=7,88×104 dan damper 30o CW dan 30o CCW. Hasil penelitian numerik akan diperoleh profil kecepatan secara dua dimensi, vektor kecepatan pada setiap cross section, pressure drop (ΔP) di sepanjang ducting system yang ditambahkan single guide vane. ================================================================================================================== Piping system installation is always has a component called fittings (accessories), which has a coefficient of losses (total headloss) and cause the pressure drop (ΔP) throughout the flow. That is because the stream that flows at the elbow suffered losses due to friction (friction loss) and the formation of secondary flow. Similar as the stream flowing in the straight pipes that suffered losses as a result of separation (separation loss). Experimental model that used in this numerical study is square ducting in the form of straight upstream channel that connected in square elbow 900. In section after elbow 900, there are downstream straight channel along the x/Dh=18 with a damper located inside along the x/Dh=2. The working fluid that used in the simulation test is flowing air at steady, incompressible fluid, fully develop and have a uniform flow conditions in the inlet side with Re=7.88×104 two damper is 30 o CW and 30 o CCW. Numerical research results will be obtained in a twodimensional velocity profile, the velocity vector at each cross section, pressure drop (ΔP) along the ducting system that added single guide vane