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Ultra-High-Speed Digital In-Line Holography System Applied to Particle-Laden Supersonic Underexpanded Jet Flows

机译:应用于粒子超声波曝光射流喷射流的超高速数字型号全息系统

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摘要

Particle-fluid interactions in supersonic flows are relevant in many different applications e.g. the cold gas-dynamic spray process. The optimal application of the process is hindered by a lack of understanding of the particle-fluid interactions. To obtain detailed information on the particle-fluid interactions in these high-speed flows special high performance techniques are required. The present work is an investigation into the applicability of magnified digital in-line holography with ultra-high-speed recording for the study of three-dimensional supersonic particle-laden flows. An optical setup for magnified digital in-line holography is created, using an ultra-high-speed camera capable of frame rates of up to 1.0MHz. To test the new technique an axisymmetric supersonic underexpanded particle-laden jet is investigated. The results show that the new technique allows for the acquisition of time resolved qualitative and quantitative data on the fluid and particle dynamics. The potential for determining the three-dimensional particle positions using holographic reconstruction is also investigated. Five different focus functions used for depthwise location are tested using two different planar targets, a 10 × 10mm calibration grid and 120 μm particles on a glass plate. In the case with the calibration grid it is found that accurate determination of the depthwise position is possible. However, when applying the same technique to the particle target, significant problems are encountered.
机译:超声速流动中的颗粒-流体相互作用在许多不同的应用中都是相关的,例如冷气动力喷涂工艺。缺乏对颗粒-流体相互作用的理解阻碍了该方法的最佳应用。为了获得有关这些高速流中颗粒-流体相互作用的详细信息,需要特殊的高性能技术。目前的工作是对具有超高速记录的放大数字在线全息术在三维超音速颗粒载流研究中的适用性进行研究。使用能够高达1.0MHz帧频的超高速相机,创建了用于放大的数字在线全息照相的光学装置。为了测试该新技术,研究了轴对称超音速欠膨胀的带颗粒射流。结果表明,该新技术允许获取有关流体和粒子动力学的时间分辨定性和定量数据。还研究了使用全息重建确定三维粒子位置的潜力。使用两个不同的平面目标,10×10mm的校准网格和玻璃板上的120μm颗粒,对用于深度定位的五个不同的聚焦功能进行了测试。在使用校准网格的情况下,发现可以精确确定深度位置。但是,当将相同技术应用于粒子目标时,会遇到重大问题。

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