| Autor: |
Nakanishi, Hiroaki, Kanata, Sayaka, Goto, Ryota, Shimomura, Takashi |
| Zdroj: |
Artificial Life & Robotics; Nov2022, Vol. 27 Issue 4, p734-742, 9p |
| Abstrakt: |
Small-scale rotorcraft, such as multi-rotor UAVs, is widely used for various purposes. In particular, aerial vehicles' inspections of infrastructures such as bridges or tunnels are highly demanded. During inspection activities, aerial vehicles must approach their walls. In those situations, walls affect the airflow around the rotor and the rotor's aerodynamic characteristics. This study aims to understand and model the wall effect that appears when the rotor approaches the wall and to develop a compensation method for the wall effect. We focused on the ceiling wall effect in this paper. A horizontal velocity of the air is induced upstream due to air intake from the surrounding region if the rotor approaches the ceiling wall. In this paper, model of the change in induced speed, thrust, and required power due to the ceiling wall effect was developed based on momentum theory, considering the airflow in the direction parallel to the ceiling wall induced near and upstream of the rotor disk surface. The effectiveness of the proposed method is demonstrated by comparing the experimental results of the thrust ratio at constant power and the thrust ratio at constant power. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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