PENGARUH KETINGGIAN DAN SUDUT KEMIRINGAN SALURAN AIR TERBUKA TERHADAP PARAMETER ALIRAN DAN PUTARAN TURBIN VORTEX

Abstract

The stream parameter was affected by the height of falling, water debit and head losses. The stream that had straight flow could be converted to vortex stream using shapping drain. The movement of the vortex stream could be converted to mechanical energy using vortex wheel. The aim of this study was to find out the effect of the height and angle in exposed water drain in stream parameter and the spinning of vortex wheel. This study used type U water drain which has different variation of height 50 mm, 80 mm, 110 mm, 140 mm, and 170 mm and different angle variation 20, 25, and 30. The stream parameter was obatined by measuring the stream surface. Furthermore, the spinning of the vortex wheel was measured using tachometer. The result of this study showed that the spinning of the vortex wheel has the highest point at 100 mm in height variation and 30 in angle variation, which has 142.85 rpm in spinning speed, 1.178 m/s in stream speed, and 102.5 mm water height in vortex in average. It was because the higher and bigger the angle, the faster the stream was. However, a high speed of the stream produced small vortex stram. It caused the area of the water to hit in temperature to decrease so that the spinning of the wheel decreased.