Wind Electronic Generator NU-101 Driven by Axial-Flow Air-Turbine with Stator

• Main Author: Seiiti Awano
• Format: Report
• Language: English
• Published: College of Science and Technology, Nihon University 1976
• Subjects: Antarctic; Syowa Station; Nozzle; Antarc*; Antarctica; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=17; http://id.nii.ac.jp/1291/00000017/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=17&item_no=1&attribute_id=18&file_no=1

"Generators driven by axial-flow air-turbine with stator are relatively small in size and can be adapted to withstand violent blizzards. They are suitable for antarctic use, especially as energy sources for unmanned observation units. An analysis is given of the performance of an axial-flow air-turbine comprising a stator having stationary blades and a rotor having moving blades. Changes in the velocity and thermodynamic properties of the air flow in passing through the turbine are discussed quantitatively, and the expression for the output power and efficiencies of the turbine are given. It is shown that the output attains its maximum when the axial velocity of the air flow in the turbine is 1/√<3> of the wind velocity. The method of evaluation of the maximum annual wind energy available is discussed. The design of turbine blades is described: the constant nozzle angle design is adopted for the stationary blades, and the axially leaving velocity design for the moving blades. The starting torque, the starting wind velocity, and the off- design performance of the wind air-turbine are also studied. The performance of an air-turbine with stator is compared theoretically to that of an ordinary wind air-turbine without stator, and it is verified the maximum output power allowable for the former will be about 140% of the latter at a lower rotational speed than the latter, which will be about 70% thereof. A wind electric generator designated NU-101 which has been designed on the basis of the discussion outlined above is described. This comprises an axial-flow air-turbine, 1.2m in diameter, whose maximum rotational velocityis 300 RPM, and a 2 kW, 100V, AC generator. In 1972, this generator wasshipped to Syowa Station, Antarctica, by the 14th Japanese Antarctic ResearchExpedition (JARE). The results of some test runs in Tokyo in 1972 and atSyowa Station in 1973 are given."