SBIR Phase I: Aerodynamic Drag Reduction with a Flexible Composite Surface De-Turbulator

研制了一种柔性复合表面去湍流器（FCSD）胶带，它可以方便地粘贴在飞机机翼等气动表面上，以减少复合表面摩擦和形成阻力。这是由于流动- fcsd的相互作用，它通过亚微米振幅的弯曲振荡抑制了大多数湍流波动，从而稳定了非零压力梯度边界层中靠近气动表面的薄的几乎停滞的子层。在标准卷云滑艇上的初步飞行评估表明，在整个可操作空速范围内，外部无动力Sinha-FCSD能够将机翼测试部分的局部剖面阻力减少17- 27%。拟议的SBIR第一期项目旨在通过飞行和风洞试验验证是否可以在机翼整个表面获得类似的改进，从而将总阻力降低约5-8%；一个关卡目前无法通过其他简单的外部无动力修改实现。这项工作主要是为了在未来两年内向全世界的滑翔机社区推出一种美国制造的滑行比增强装置。商用飞机减少阻力所节省的燃料不仅有助于我们更好地利用化石燃料，而且有助于减少向大气中排放温室气体。

A flexible composite surface de-turbulator (FCSD) tape has been developed which can be conveniently affixed to aerodynamic surfaces, such as aircraft wings, to reduce the combined skin-friction and form drag. This is due to the flow-FCSD interaction, which damps out most turbulent fluctuations through sub-micron amplitude flexural oscillations, thereby stabilizing a thin nearly stagnant sub-layer next to the aerodynamic surface in non-zero pressure gradient boundary layers. Preliminary flight evaluations on a Standard Cirrus sailplane have shown the externally un-powered Sinha-FCSD capable of reducing the local profile drag of a test section of the wing by 17- 27% over the entire operable airspeed range. The proposed SBIR Phase-I project is aimed at verifying, through flight and wind-tunnel tests if similar improvements can be obtained for the entire surface of the wing, so as to reduce the overall drag about 5-8%; a level currently not feasible through other simple externally un-powered modifications. The proposed work is primarily geared towards launching a U.S.-made glide-ratio enhancement device to the sailplane community worldwide with the next two years. Fuel savings resulting from drag reduction of commercial aircraft will not only help us better utilize fossil fuels for this purpose but also help reduce the injection of greenhouse gases into the atmosphere.