NUMERICAL AND EXPERIMENTAL MODELING OF SMALL HYDROPOWER TURBINE

Abstract

Recently, Archimedes screw turbines have been developed to operate as small hydropower stations, because of its reliability to operate with the low head(less than 5m) and its low cost of design and operation. In the present study, the influence of the flow rate, shaft inclination angle, and the number of blades is studied using physical model and numerical model to determine the performance of Archimedes screw turbine at Ramadi Barrages in Iraq. The physical model was made of stainless steel with the following parameters: (the radius ratio is 0.536, the pitch is 70 mm, and the shaft angles are 30⁰, 35⁰, 40⁰, and 45⁰). The experimental work on the physical model is achieved with different flow rates and angles .The results showing that the highest efficiency is 81.4 % at the angle of 35⁰ and the flow rate is 1.12 l/s. The maximum energy obtained is 25.13 w at the angle of 45⁰, the flow rate is 2.065l/s, and the efficiency was 72%. Also the results shows that the increase in the number of blades increases the torque and efficiency of the turbine. There is a good agreement between the experimental and numerical model