Pengaruh Penempatan Penghalang Berbentuk Segitiga di Depan Silinder dengan Variasi Kecepatan Aliran Udara terhadap Koefisien Drag
Abstract: One of the ways to
preserve energy on the air plane is by decreasing the drag. Drag is closely
related to the flow separation, the faster the separation, then the drag will
increase more. Because of that, efforts were conducted to decrease drag is by
manipulating a fluid flow field that is by installing triangle rod obstacle in
front of the cylinder. The purpose of this research is to analyze the effect of
installing triangle rod obstacle in front of the cylinder by various air flow
velocity on the drag cofficient. In this research, the experiment was conducted
in the wind tunnel, which consists of blower, pitot pipe, manometer, cylinder
pipe, and triangle rod. The air flow velocity was varied from 6.25 m/s, 5.01
m/s, 4.09 m/s, 3.17 m/s, 2.24 m/s .The Reynold number based on cylinder (D = 42
mm) and air flow velocity is Re =18.100, 14.500, 11.800, 9.170, 6.480 .The
distance triangle rod and cylinder is L = 70 mm or L/D=1.67.Pressure
distribution is achieved by measuring the cylinder surface on 36 spots with
interval of 100. The measured data was pressure of cylinder surface, static
pressure, and airflow speed. The research results showed that the triangle rod
could decrease the drag of cylinder. Coefficient drag for cylinder without
triangle rod was 0,1276 while the less triangle rod was 0,01882 which takes
place at speed 6,2479 m/s.
Penulis: Si Putu Gede Gunawan
Tista, I Gusti Agung Kade Suriadi, Putu Pageh Astawa
Kode Jurnal: jptmesindd150520
