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arXiv 2006.09560physics.flu-dynphysics.app-ph
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利用风洞壁压计算翼型升力

Airfoil Lift Calculation Using Wind Tunnel Wall Pressures

Sreevishnu Oruganti, Shreyas Narsipur

摘要:

本文探讨了利用风洞壁静压孔计算升力的实验方法及其有关限制。虽然壁压测量(WPM)技术已被其他研究人员用于升力计算,但关于WPM方法对试验截面尺寸、翼型弦长和模型厚度的敏感性的文献还很缺乏。弦灵敏度研究表明,翼型弦在测量的准确性中起着重要的作用,并且需要针对给定的测试截面尺寸适当地确定尺寸,以使WPM方法的性能达到最佳。提出了一个弦灵敏度参数($CSP$),并确定了一个下限($=0.025$),以使理想弦长与风洞试验截面尺寸相关联,从而确保最佳升力测量能力。最后,对厚度从$6\%-21\%$变化的对称翼型和弯曲翼型的组合进行了试验,并成功地对自由翼弦雷诺数范围为100,000至550,000的参考数据进行了验证。WPM方法被发现对变化的表面流动条件和翼型厚度是敏感的,并且已经被证明是使用负载平衡或表面压力端口的传统升力测量技术的可行替代。

英文摘要:

An experimental method to calculate lift using static pressure ports on the wind tunnel walls and its associated limits has been explored in this paper. While the wall-pressure measurement (WPM) technique for lift calculation has been implemented by other researchers, there is a lack of literature on the sensitivity of the WPM method to test section size, airfoil chord, and model thickness. Chord sensitivity studies showed that the airfoil chord plays an important role in the accuracy of the measurements and needs to be appropriately sized for a given test section dimensions for optimum performance of the WPM method. A chord sensitivity parameter ($CSP$) was formulated and a lower limit ($=0.025$) was established to relate the ideal chord-length to wind tunnel test-section dimensions to ensure best lift measuring capabilities. Finally, a combination of symmetric and cambered airfoils with thicknesses varying from $6\%-21\%$ were tested and successfully validated against reference data for a freestream chord Reynolds number range of 100,000 to 550,000. The WPM method was found to be sensitive to varying surface flow conditions and airfoil thickness and has been shown to be a viable replacement to traditional lift measurement techniques using load balances or surface pressure ports.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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