Coefficient of power of Indonesian traditional wind-pump blade model

Mechanical Engineering, Faculty of Science and Technology Sanata Dharma University, Yogyakarta, Indonesia

^* Corresponding author: lukiyanto@usd.ac.id

Abstract

Indonesia has wind energy potential as a renewable energy resource which is currently being developed intensively. Salt farmers have used it with wind-pump as part of the traditional salt-making process. They have the ability to manufacture, operate and maintain the Indonesian traditional wind-pump. The aim of the experiment was to find out characteristic of windmill of the traditional wind-pump. The characteristics was expressed with relation of coefficient of power (Cp) and the tip speed ratio (tsr). The ratio of the wind mill model was 1: 2.5. The wind mill model consisted of four blades and 80 cm diameter. The experiment was done in a wind tunnel with wind speed of 5 m/s. The adjustable shaft load was electric machine. In the experiment, the wind speed range was 5.7 up to 6.3 m/s and shaft speed was 42.3 up to 387.4 rpm. The experiment resulted minimum and maximum tsr and Cp were 0.295 up to 2.705 and 2.623 up to 11.073, respectively. The experiment found out relationship of Cp and tsr in an equation Cp = -3.248 tsr² + 12.29 tsr – 1.007. The equation showed that the traditional windmill model has maximum Cp of 10.62 at the tsr of 1.89.