Optical density and velocity measurements in cryogenic gas flows
Optical density and velocity measurements in cryogenic gas flows
复制标题
低温气流中的光密度和速度测量
DOI：
10.1007/s00348-005-0966-8
复制
发表时间：
2005
影响因子：
2.4
通讯作者：
T. Rösgen
中科院分区：
文献类型：
--
作者：
O. Jensen;J. Kunsch;T. Rösgen
本文介绍了光学测量技术在重气通道中的稠密气体流动中的应用，以确定平面二分量（2C）速度分布和二维（2D）温度分布。实验方法在这一领域是相当新的，并代表了基于热电偶测量的传统技术相比的进步。稠密气流是由液氮蒸发产生的。通过粒子图像测速（PIV）和背景定向纹影（BOS）系统的实施，完成了速度和密度分布的光学测量。补充热电偶测量用作独立校准，以从BOS系统测量的密度数据中获得温度。两个系统获得的结果被用来通过全局卷吸参数β量化传播云的稀释行为。其值与早期研究的结果一致。
This paper presents the application of optical measurement techniques in dense-gas flows in a heavy-gas channel to determine planar two-component (2C) velocity profiles and two-dimensional (2D) temperature profiles. The experimental approach is rather new in this area, and represents progress compared with the traditional techniques based on thermocouple measurements. The dense-gas flows are generated by the evaporation of liquid nitrogen. The optical measurement of both the velocity and density profiles is accomplished by the implementation of particle image velocimetry (PIV) and background-oriented schlieren (BOS) systems. Supplemental thermocouple measurements are used as independent calibrations to derive temperatures from the density data measured with the BOS system. The results obtained with both systems are used to quantify the dilution behavior of the propagating cloud through a global entrainment parameter β. Its value agrees well with the results obtained by earlier studies.