Image measurements of unsteady pressure fluctuation by a pressure-sensitive coating on porous anodized aluminium
Image measurements of unsteady pressure fluctuation by a pressure-sensitive coating on porous anodized aluminium
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DOI：
10.1088/0957-0233/16/12/017
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发表时间：
2005-12-01
影响因子：
2.4
通讯作者：
Asai, K
中科院分区：
文献类型：
--
作者：
Kameda, M;Tabei, T;Asai, K
多孔阳极氧化铝上的压敏发光涂层（AA-PSP）用于测量风洞模型上的非周期性非稳态压力分布。使用高速数字摄像机来捕获 PSP 信号。压敏染料是三(4,7-二苯基菲咯啉)钌(II)([Ru(dpp)(3)](2+))。尽管该涂层表现出温度和湿度敏感性，但其响应时间很短，为 O(10 μs)。在阳极氧化铝表面涂覆疏水涂层以抑制湿度敏感性。使用温度敏感涂料来获得随压力瞬时变化的温度分布。温度数据用于校正 PSP 响应。建立了适当的数据采集程序以及数字图像处理算法来补偿温度和湿度灵敏度的误差。该系统用于测量跨音速流中大迎角三角翼上的压力分布，由于激波和前缘涡之间的相互作用，跨音速流的流动是不稳定的。以1 kHz的采样率成功测量了三角翼上的非周期性非定常压力分布，绝对压力水平误差在百分之几以内。
Pressure-sensitive luminescent coating on porous anodized aluminium (AA-PSP) was applied to measure non-periodic unsteady pressure distribution on a wind-tunnel model. A high-speed digital video camera was used to capture the PSP signal. The pressure-sensitive dye was tris(4,7-diphenylphenanthroline) ruthenium(II) ([Ru(dpp)(3)](2+)). The coating has a short response time of O(10 mu s), although it exhibits temperature and humidity sensitivities. A hydrophobic coating was applied on the anodized aluminium surface to suppress the humidity sensitivity. A temperature sensitive paint was used to obtain the temperature distribution instantaneously with the pressure. The temperature data were used to correct the PSP response. An appropriate data acquisition procedure as well as digital image processing algorithm was established to compensate for the error from the temperature and humidity sensitivities. The present system was applied to measure the pressure distribution on a delta wing at a high angle of attack in transonic flow, whose flow is unsteady due to the interaction between shock waves and leading edge vortices. The non-periodic unsteady pressure distribution on the delta wing was successfully measured with the sampling rate of 1 kHz and within a few per cent error in absolute pressure level.