周期非定常跨音速流场的试验研究压缩机叶片周围的粒子图像测速技术(PIV)

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在本文中,研究时间的跨声速流场在一个孤立翼型在拉伐尔喷嘴。为了获得瞬时流场信息在叶片绕流,粒子图像测速仪(PIV)方法允许使用一个获取速度数据在一个明亮的光表数据采集率高和较高的空间分辨率。从这些瞬时PIV测量平均速度场和湍流量的流很容易可以通过统计手段获得。单个压缩机叶片NACA 3506和78毫米的弦长集中安装在测试部分。一个振动系统由液压马达驱动外部附着在叶片。电动机的旋转运动转化为暴跌叶片振动通过偏心轴垂直于弦和连接的手臂。可以不同的振动频率在0和100赫兹之间,和平均幅度大约是0.4毫米。整个blade-motor总成安装在隧道边墙通过圆盘允许方便的调节进气道流的入射角。喷嘴的出口压力可以由一个旋转的各种平板(15毫米高,39毫米宽,2毫米厚),安装大约5倍弦长叶片mid-chord的下游。这个组装可以不同的转动频率在0和100赫兹之间,生产upstream-running波在翻了一倍(即频率。0到200赫兹)。上面的励磁系统可以精确地同步以及它们之间的相位滞后可以自由多样。 This allows for unsteady measurements to be conducted in the presence of only the downstream perturbation, only the blade vibration, or a combination of the two for different phase angles.For the first test series the existing PIV measurement system at Turbomachinery Institute (LTT) has been applied to measure the transonic steady flow field around the compressor blade. In another test series, measurements of the time-dependent periodic flow field were conducted by means of PIV. This measurement series consisted of three subtasks: the measurement of the unsteady flow field with only back pressure variation, with only blade vibration, and finally with a combination of both back pressure variation and blade vibration. These results quantify not only the unsteady motion of the normal shock for each case on the suction side of the blade, but also give a detailed insight into the instantaneous transonic flow field around the compressor blade. Furthermore, the results of the set of unsteady measurements with both back pressure variation and blade vibration (3) is compared with the combination of the results of the sets of unsteady measurements of only back pressure variation (1) and only blade vibration (2) to validate the superposition principle.Finally, phase averaging of the instantaneous flowquantities produced a large database for statistical treatment (e.g., turbulence) and thus the ability to compare the averaged results with those from traditional measurement techniques.

旋转机械的国际期刊

周期非定常跨音速流场的试验研究压缩机叶片周围的粒子图像测速技术(PIV)

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