Simultaneous temperature, mixture fraction and velocity imaging in turbulent flows using thermographic phosphor tracer particles.
Simultaneous temperature, mixture fraction and velocity imaging in turbulent flows using thermographic phosphor tracer particles.
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DOI：
10.1364/oe.20.022118
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发表时间：
2012-09
期刊：
影响因子：
3.8
通讯作者：
B. Fond;Christopher Abram;A. Heyes;A. Kempf;F. Beyrau
中科院分区：
文献类型：
--
作者：
B. Fond;Christopher Abram;A. Heyes;A. Kempf;F. Beyrau
本文提出了一种基于种子热成像荧光粉颗粒的光学诊断技术，它允许同时二维测量湍流中的气体温度，速度和混合分数。记录颗粒Mie散射信号以使用常规PIV方法确定速度，并且检测磷光发射以使用双色方法确定示踪剂温度。在这项工作中提出的理论模型表明，小示踪剂颗粒的温度匹配的气体温度。此外，通过将磷光颗粒接种到一个流中并将非发光颗粒接种到另一个流中，还可以使用调节温度后的磷光发射强度来确定混合物分数。详细描述了实验技术，并根据光谱调查确定了合适的磷光体。通过同时测量加热到700 K的湍流射流中的温度、速度和混合分数，证明了联合诊断。相关的单次发射的精度为2%至5%，准确度为2%。
This paper presents an optical diagnostic technique based on seeded thermographic phosphor particles, which allows the simultaneous two-dimensional measurement of gas temperature, velocity and mixture fraction in turbulent flows. The particle Mie scattering signal is recorded to determine the velocity using a conventional PIV approach and the phosphorescence emission is detected to determine the tracer temperature using a two-color method. Theoretical models presented in this work show that the temperature of small tracer particles matches the gas temperature. In addition, by seeding phosphorescent particles to one stream and non-luminescent particles to the other stream, the mixture fraction can also be determined using the phosphorescence emission intensity after conditioning for temperature. The experimental technique is described in detail and a suitable phosphor is identified based on spectroscopic investigations. The joint diagnostics are demonstrated by simultaneously measuring temperature, velocity and mixture fraction in a turbulent jet heated up to 700 K. Correlated single shots are presented with a precision of 2 to 5% and an accuracy of 2%.