Measurement of boundary layer transition on oscillating airfoil using cntTSP in low-speed wind tunnel
Measurement of boundary layer transition on oscillating airfoil using cntTSP in low-speed wind tunnel
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DOI：
10.1088/1361-6501/abe2be
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发表时间：
2021-07-01
影响因子：
2.4
通讯作者：
Yorita, Daisuke
中科院分区：
文献类型：
--
作者：
Ikami, Tsubasa;Fujita, Koji;Yorita, Daisuke
cntTSP 是一种结合了温敏涂料 (TSP) 和碳纳米管 (CNT) 的流动可视化技术。 TSP是一种喷雾式温度传感器，CNT用作TSP的薄型内部电加热器。 cntTSP 技术可以可视化移动机翼上边界层过渡的运动。在本研究中，cntTSP 应用于低速风洞中的俯仰振荡翼型。作为检测边界层转变位置的方法，对三种方法进行了比较。使用通过表面温度计算的传热系数成功地评估了转变位置。此外，在高降低频率下，检测到的转变位置在向上俯仰和向下俯仰过程之间是不同的。此外，我们观察到过渡位置的磁滞回线。
cntTSP is a flow visualization technique that combines temperature-sensitive paint (TSP) and carbon nanotube (CNT). TSP is a sprayable temperature sensor, and CNT is used as a thin inner electric heater for the TSP. The cntTSP technique allows the visualization of the movement of the boundary layer transition on a moving airfoil. In this study, cntTSP was applied to a pitch-oscillating airfoil in a low-speed wind tunnel. Three methods were compared as methods for detecting the boundary layer transition position. The transition position was successfully evaluated using a heat transfer coefficient that was calculated by the surface temperature. Moreover, at a high-reduced frequency, the detected transition positions were different between the pitching-up and pitching-down procedure. Moreover, we observed a hysteresis loop of the transition position.