Vertical Microstructure Profiler: Validation of shear sensors in supercritical angle of attack and pressure sensor to measure mean velocity and stream-wise turbulence

垂直微结构剖面仪VMP通过以下方式测量海洋、湖泊和河流中的微结构湍流 使设备在水柱中下沉或上升，以测量高达200赫兹的速度波动 两个横轴方向。我们的河流水动力研究小组将与 Rockland Science International，扩展了VMP的功能。VMP-250将在 马尼托巴大学的水洞。剪切探头目前测量相对角度的速度波动 攻击范围不到20度。20度的攻角限制从未进行过系统的测试。 对于超临界攻角，剪切探头的响应是未知的，这种情况发生在 VMP不随平均流速漂移，流速是剖面仪下沉速度的两倍以上 或者利率上升。将设计一个橡胶支架，以将VMP-250探头固定在水洞中 使用放置在上游的圆柱体改变攻角的能力。将进行一系列水洞测试 对相对攻角高达60度的湍流测量精度进行了研究。 罗克兰科学国际公司将制造高频响应压力传感器，以添加到VMP中 在水洞里进行了测试。一种沿流测量流速波动的数据处理算法 将开发使用压力传感器的方向和平均流速，并研究其准确性 和可靠性。该项目将为科学和技术领域的水上湍流研究做出贡献。 工程学，特别是在河流和潮汐水道等高流量环境中的应用 气候变化研究和海洋可再生能源。该项目将使Rockland Science 国际，全球剪切探头市场的领先者，将VMP设备的功能扩展到更好 满足新的市场需求。

The Vertical Microstructure Profiler, VMP, measures microstructure turbulence in oceans, lakes and rivers by having the device sink or rise through the water column to measure velocity fluctuations at up to 200 Hz in both cross-axial directions. Our river hydrokinetic research group will investigate, in collaboration with Rockland Scientific International, extending the VMP's functionality. The VMP-250 will be tested at the University of Manitoba water tunnel. Shear probes currently measure velocity fluctuations at relative angles of attack less than 20 degrees. The angle of attack limitation of 20 degrees has never been systematically tested. For supercritical angles of attack, the response of the shear probes is unknown, a condition that occurs when the VMP is not drifting with the mean flow velocity and the flow speed is more than twice the profiler sinking or rising rate. A rubberized mount will be designed to secure the VMP-250 probe in the water tunnel with the ability to change the angle of attack using a cylinder placed upstream. A series of water tunnel tests will be conducted to investigate the accuracy of turbulence measurement for relative angle of attacks up to 60 degrees. Rockland Scientific International will fabricate a high frequency response pressure sensor to add to the VMP tested in the water tunnel. A data processing algorithm to measure velocity fluctuations in the stream-wise direction and the mean flow velocity using the pressure sensor will be developed and investigated for accuracy and reliability. This project will contribute to the field of aquatic turbulence research in science and engineering, particularly in high flow environments such as rivers and tidal channels, with applications in climate change research and marine renewable energy. The project will enable Rockland Scientific International, the world market leader in shear probes, to expand the functionality of VMP devices to better address new market demands.