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Research Activities of Active Tab for Helicopter Noise Reduction.
| 题名： | Research Activities of Active Tab for Helicopter Noise Reduction. |
| 作者： | Kobiki-N.; Saito-S.; Aoyama-T.; Yang-C. |
| 关键词： | *Aircraft-noise; *Noise-reduction; *Helicopters-.;Computational-fluid-dynamics-CFD; Aeroacoustics-; Sound-waves. |
| 摘要： | This paper presents the concept of the active tab which is a new active technique for the helicopter noise reduction, the policy for its aerodynamic design and the results of the experimental activities performed in 2D configuration to evaluate the effect of the active tab with regard to the potential for the noise reduction. The static wind tunnel test was performed in 2002 to study whether a realistic size tab has the aerodynamic capability equipment to the noise reduction. It is shown by the test result that the tab of around 8%blade chord with more than 6 deg. Deflection can achieve the sufficient aerodynamic work for the rotor noise reduction. The dynamic wind tunnel test was carried out in 2003 to study the unsteady aerodynamic effect of the active tab and to conclude that the more than 11%active tab extension with 10 deg deflection has the sufficient capability for the rotor noise reduction. Finally, the outline of the future work of this research activity is described. |
| 报告类型： | 科技报告 |
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