Low reynolds number surge response of a flat plate wing at 90 degrees incidence
Low reynolds number surge response of a flat plate wing at 90 degrees incidence
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90 度入射时平板机翼的低雷诺数喘振响应
DOI：
10.2514/6.2017-0330
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发表时间：
2017
期刊：
影响因子：
2.5
通讯作者：
H. Babinsky
中科院分区：
文献类型：
--
作者：
S. Corkery;R. Stevens;H. Babinsky
© 2017，美国航空航天研究所有限公司。All rights reserved.本文对平板机翼从静止状态以90°迎角加速到自由流方向时的非定常力响应进行了实验研究。进行这项工作是为了测试NATO AVT-202任务组开发的低雷诺数下俯仰和喘振机翼的低阶模型。该模型将机翼上的力响应表示为涡动力学引起的循环分量和附加质量引起的非循环分量之和。对快速和慢速加速速率进行力测量、流场可视化和PIV测量，以相对隔离附加质量的影响。测量结果表明，修正的瓦格纳函数能对喘振机翼加速阶段的涡流增长作出令人惊讶的合理预测，然而，它却不能正确地预测稳态时的涡流增长。提出附加质量是产生涡量的一种机制，因此涡对环量的PIV测量也可以包含附加质量引起的脉动。当PIV测量值补偿了附加质量时，低阶模型预测的阻力与力平衡测量值之间具有良好的一致性。
© 2017, American Institute of Aeronautics and Astronautics Inc. All rights reserved. This article presents an experimental investigation into the unsteady force response of a at plate wing when accelerated from rest at 90° incidence to the free stream direction. The work was performed to test a low order model developed by the NATO AVT-202 task group for pitching and surging wings at low Reynolds numbers. The model expresses the force response on a wing as the sum of circulatory components due to vortex dynamics, and non-circulatory components due to added mass. Force measurements, flow visualisation, and PIV measurements were taken for a fast and slow acceleration rate to relatively isolate the effect of added mass. Measurements suggest that the modified Wagner function can give a surprisingly reasonable prediction of vortex growth during the acceleration phase of a surging wing, however, incorrectly predicts vortex growth at steady state. It is proposed that added mass is a mechanism that generates vorticity, thus PIV measurements of circulation of the vortex pair can also contain the impulse due to added mass. When PIV measurements are compensated for added mass, good agreement between the drag predicted by the low order model and force balance measurement is shown.