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An experimental study on self-output-control characteristics of micro downwind rotor with coning soft blades

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Abstract

In this short paper, we have treated the aerodynamic performance of micro downwind rotor with coning soft blades experimentally. The test wind rotor has the tip diameter of 1.5 m and three two-dimensional NACA0018 blades of 0.15 m chord whose material is light, soft and pliable foam plastic for perfect safety. From the wind tunnel test, it is realized that the performance is manageable by the coning angle of the rotor blade. In the present case, an improvement of the performance in lower wind speeds is achieved by using the coning blade of 20°. Besides, owing to the torsional deformation of very soft blade, the self-power-control characteristic is observed in every test rotor regardless of coning angle in the range of 0°–20° under the wind speed less than 12 m/s.

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Abbreviations

A 0 :

rotor swept area (m2)

Cp :

power coefficient (see eq. (1))

n :

rotational speed (r/min)

P :

shaft power = Tω(W)

T :

shaft torque (Nm)

V :

wind speed (m/s)

λ :

tip speed ratio (see eq.(2))

ρ :

air density (kg/m3)

ω :

angular velocity (rad/s), = 2πn/60

m :

value at the peak

References

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Authors and Affiliations

  1. State Key Laboratory of Hydro Science and Hydraulic Engineering, Department of Thermal Engineering, Tsinghua University, Beijing, 100084, China

    ShuHong Liu & XianWu Luo

  2. Sophia Engineering CO., Ltd., Kikugaoka 1-15-25, Kokuraminami, Kitakyushu, 802-0981, Japan

    Hidenori Eguchi

  3. Mechanical Engineering Department, Kyushu Institute of Technology, Sensui-cho 1, Tobata, Kitakyushu, 804-8550, Japan

    Kouichi Yoshida

  4. Senior Academy, Kyushu Institute of Technology, Sensui-cho 1, Tobata, Kitakyushu, 804-8550, Japan

    Michihiro Nishi

Authors
  1. ShuHong Liu
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  2. XianWu Luo
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  3. Hidenori Eguchi
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  4. Kouichi Yoshida
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  5. Michihiro Nishi
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Corresponding author

Correspondence to ShuHong Liu.

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Liu, S., Luo, X., Eguchi, H. et al. An experimental study on self-output-control characteristics of micro downwind rotor with coning soft blades. Sci. China Ser. E-Technol. Sci. 53, 100–104 (2010). https://doi.org/10.1007/s11431-009-0410-z

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  • DOI: https://doi.org/10.1007/s11431-009-0410-z

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