Small-sized Wind Research Articles

Acoustic noise from tandem wind rotors of intelligent wind power unit

The authors had invented the unique wind power unit composed of the large-sized front wind rotor, the small-sized rear wind rotor and the peculiar generator with the inner and the outer rotational armatures without the conventional stator. This unit is called “Intelligent Wind Power Unit” by the authors. The front and the rear wind rotors drive the inner and the outer armatures, respectively, while the rotational torque is counter-balanced between both armatures/wind rotors. This paper discusses experimentally the acoustic noise from the front and the rear wind rotors. The acoustic noise, in the counter-rotating operation, is induced mainly from the flow interaction between both rotors, and has the dominant power spectrum density at the frequency of the blade passing interaction. The noise is caused mainly from the turbulent fluctuation due to the flow separation on the blade, when the rear wind rotor stops or rotates in the same direction as the front wind rotor.

804 ネオジウム鉄ボロン永久磁石を用いた小型風力発電機とその応用(GS-5・GS-8 自然エネルギー利用)

804 ネオジウム鉄ボロン永久磁石を用いた小型風力発電機とその応用(GS-5・GS-8 自然エネルギー利用)

Study on Performance Improvement of Cross-Flow Wind Turbine with Symmetrical Casing

Cross-flow wind turbine has a characteristic of high torque coefficient at low tip speed ratio. Therefore, it is good for the self-starting. Furthermore, it is low noise and superior to stability so that it attracts attentions as the city type small-sized wind turbine for urban district. But the maximum power coefficient is extremely low as 10% compared with other small-sized wind turbines. In order to improve the performance and the flow condition of cross-flow rotor, a symmetrical casing with a nozzle and a diffuser was proposed and experimental research with two kinds of symmetrical casings was conducted. The maximum power coefficient was obtained as Cpmax=0.17 for the casing 2, however as Cpmax=0.098 for the casing 1. In the present paper, power characteristics of cross-flow rotor and one of a symmetrical casing with a nozzle and a diffuser were investigated. Then the performance and internal flow field of a cross flow wind turbine with the symmetrical casing were clarified. After that, the effect of the symmetrical casing on performance would be discussed with these results.

2529 垂直軸型風車の特性試験結果(S47-5 自然の流体エネルギー利用技術(風車3),S47 自然の流体エネルギー利用技術)

The popularization of both small-sized and large-sized wind turbines is indispensable for the popularization of wind power generation. Though many small-sized wind turbines are manufactured in the world, most of them are not suitable for the special wind conditions in Japan, which are characterized by frequent change of wind direction and heavy turbulence. This paper describes the results of the characteristics test of a small-sized perpendicular-axis type wind turbine to identify the conditions of a small-sized wind turbine suited to Japanese wind conditions.

810 小型風力発電機の磁場解析と最適設計(環境工学,設計工学・システムI)

810 小型風力発電機の磁場解析と最適設計(環境工学,設計工学・システムI)

601 小型風力発電機の磁場解析と最適設計(J02-1 解析・設計の高度化・最適化(1),J02 解析・設計の高度化・最適化)

The purpose of this research is to lead the design guidance to obtain the best internal structure in a small-sized wind power generator that can rotate at a low wind velocity. Some experiments have been conducted in the past, and it was found that the analytical results coincide with the experimental ones In the present report, two analysis were conducted One is to confirm which material in the core is suitable. The other is to understand how the number of coil and magnet effect on the efficiency of the generator. The objective generation of designed generator was set as 5 kilowatt.

OS2-12 小型風車の特性試験結果(OS2 自然エネルギー)

OS2-12 小型風車の特性試験結果(OS2 自然エネルギー)

1112 風力発電機の IT コラボレーション設計

1112 風力発電機の IT コラボレーション設計

2539 ジャイロタイプ風力発電機の風洞実験と発電機の性能

This report describes the development of small-sized wind power generators. The characteristics of the generator are rare-earth permanent magnets and core-less coils. We performed the wind tunnel experiment using the generator and Gyroscope-type wings. After obtaining the experimental results, some analytical works using IEM (Integral Element Method) software on dynamic magnetic field ware performed. We aim to obtain the way to the best design for the generator from experimental and analytical studies.

3205 3D-CADによる設計教育と小型風力発電機の設計(OS06-1/設計教育(1))(OS06/設計教育)

3205 3D-CADによる設計教育と小型風力発電機の設計(OS06-1/設計教育(1))(OS06/設計教育)

Load Matching and Centrifugal Pitch Control of Small-sized Wind Turbine

Load Matching and Centrifugal Pitch Control of Small-sized Wind Turbine