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首页> 外文会议>AIAA SciTech Forum and Exposition >Effect of a leading-edge fillet on the wall surface pressure fluctuations upstream of the leading edge of an appendage-body junction
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Effect of a leading-edge fillet on the wall surface pressure fluctuations upstream of the leading edge of an appendage-body junction

机译：前缘内圆角对阑尾 - 骨干交界处的前缘上游壁面压力波动的影响

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Junction flows occur when a boundary layer interacts with an obstacle attached to a solid surface. The velocity field and flow structure of junction flows have been extensively studied and the effect of several control mechanisms that have been investigated in past studies have been reviewed. The effect of a leading-edge fillet, specifically, on the root mean square and spectral characteristics of wall pressure fluctuations has not been sufficiently documented in past studies. Measurements of wall surface pressure fluctuating for NACA0012 airfoil with and without fillet in the upstream region of the appendage-wall junction region were performed. The measurements were performed in a closed-section benchtop wind-tunnel. The chord-based Reynolds number was approximately 139,000 and the airfoil aspect ratio was 1.0. Several geometric angles of attack ≤ 12-deg were considered for measurements. The measurements were performed in the UNSW AF1125 wind tunnel using remote microphone method for NACA0012 airfoil with and without the leading-edge fillet for varying angles of attack. The results from measurements indicate that the presence of the leading-edge fillet increases the magnitude of pressure spectra at all angles of attack across most of the low-frequency range and suppresses high-frequency content due to an increase in large-scale recirculating structures. For any given angle of attack, the surface pressure fluctuations are most intense in regions close to the leading-edge but the effects of the presence of the leading-edge can be measured even far upstream of the leading-edge. The histograms of the surface pressure fluctuations reveal that there is no bimodal behaviour observed at any of the measurement locations. The effect of the leading-edge fillet is also observed in the production of tonal noise.
机译：当边界层与连接到固体表面的障碍物相互作用时发生连接流。已经广泛研究了结流的速度场和流动结构，并综述了过去研究已经研究过的几种控制机制的效果。具体地，在过去的研究中没有充分地记录了前缘圆角的效果。进行了在附加壁结区域的上游区域中具有和不具有圆角的NaCA0012翼型的壁表面压力波动的测量。测量是在封闭部分的台式风隧道中进行的。基于和弦的雷诺数约为139,000，翼型纵横比为1.0。考虑了几何攻击≤12°的测量值。使用用于NACA0012翼型的远程麦克风方法在UNSW AF1125风洞中进行测量，其具有且没有前缘圆角的用于变化的攻击角度。测量结果表明，前缘圆角的存在在大多数低频范围内的所有角度的所有角度上增加了压力光谱的大小，并且由于大规模再循环结构的增加，抑制了高频含量。对于任何给定的攻角角度，表面压力波动在靠近前缘的区域中最强烈地是最强烈的，但是可以在前缘的上游测量前缘的存在的效果。表面压力波动的直方图表明在任何测量位置都没有观察到的双峰行为。在色调噪声的生产中也观察到前缘圆角的效果。

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