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

SBIR 第一阶段：使用柔性复合材料表面去湍流器减少空气动力阻力

• 批准号: 0420115
• 负责人: Sumon Sinha
• 金额: $ 10万
• 依托单位: SINHATECH
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-07-01 至 2004-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0420115&HistoricalAwards=false
• 关键词: SBIR; Phase; Aerodynamic; Drag; Reduction

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.

研制了一种柔性复合材料表面减阻带（FCSD），它可以方便地粘贴在机翼等气动表面上，以减小表面摩擦和形状阻力。这是由于流-FCSD相互作用，其通过亚微米振幅弯曲振荡衰减了大多数湍流波动，从而稳定了非零压力梯度边界层中空气动力学表面附近的薄的几乎停滞的子层。对标准Cirrus滑翔机的初步飞行评估表明，外部无动力Sinha-FCSD能够在整个可操作空速范围内将机翼试验段的局部剖面阻力降低17 - 27%。建议的SBIR第一阶段项目旨在通过飞行和风洞试验验证是否可以对整个机翼表面进行类似的改进，以便将总阻力降低约5 - 8%;目前通过其他简单的外部无动力修改是不可行的。拟议的工作主要是为了启动一个美国-在接下来的两年内，向全球滑翔机界提供滑翔比增强装置。商用飞机减阻带来的燃料节省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注入的温室气体。