Recent developments and applications of quantitative laser light sheet measuring techniques in turbomachinery components
Recent developments and applications of quantitative laser light sheet measuring techniques in turbomachinery components
复制标题
定量激光光片测量技术在涡轮机械部件中的最新进展和应用
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
C. Willert
中科院分区：
文献类型：
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作者：
I. Roehle;R. Schodl;P. Voigt;C. Willert
随着燃气轮机的进一步发展，气动热力设计的进步可以通过改进数值模拟方法和试验测试技术的共同努力来实现。伴随着数值能力的快速发展，对实验数据的需求也在不断增加。在这方面，正在进行大量的仪器研究工作，以开发所需的测量技术。由于需要降低实验成本，平面测量技术经历了快速的发展。本文介绍了三种利用示踪剂颗粒散射光的新发展的定量光片技术。首先，提出了一种针对时间平均三分量速度测量进行优化的多普勒全球测速系统。该系统使用一个观察方向和三个不同的照明方向，可实现非常精确的速度测量。其次，讨论了定量光片(QLS)技术在混合过程中定量质量分数测量中的应用。要应用这项技术，混合实验的流入必须至少包括两个单独的流，其中一个可以被播种，而另一个则保持不播种。给出了在模型燃烧室中进行的DGV和QLS实验研究结果。第三，描述了一种基于示踪剂的激波可视化(TSV)方法，该方法能够通过分析激波密度的突然增加来确定跨声速流动中激波的形状和结构。给出了在跨音速压气机上的实验结果。
Concerning the further development of gas turbine engines, advances of the aero-thermodynamic design can be achieved most efficiently by co-operative efforts aimed at the improvement of both the numerical simulation methods and the experimental test and measurement techniques. Rapid development of numerical capability is accompanied by increasing demands on experimental data. In this context significant instrumentation research efforts are being conducted to develop the needed measurement technologies. Because of the need for reduced experimental costs planar measurement techniques have undergone a rapid pace of development. Three newly developed quantitative light sheet techniques utilizing the scattered light of tracer particles are described in this paper. First a Doppler global velocimetry (DGV) system optimized for time-averaged three component velocity measurements is presented. The system, which uses a single viewing direction in conjunction with three different illumination directions enables very accurate velocity measurements. Second a quantitative light sheet (QLS) technique for quantitative mass fraction measurements in mixing processes is treated. To apply the technique the inflow of the mixing experiment must consist at least of two separate flows, one of which can be seeded while the other remains unseeded. DGV and QLS results obtained from experimental investigation in a model combuster are presented. Third a method named tracer-based shock visualization (TSV) is described which is capable of determining the shape and structure of shock waves in transonic flows by analysing the sudden increase of flow density across a shock. Results taken in a transonic compressor are presented.