激光法测量湍流流场时散射粒子的选择

Choice of scattering particles during measuring turbulent flow field with particle dynamic analyzer

摘要: 激光技术测速时需要有合适的粒子。本文研究了用三维粒子动态分析仪(PDA)测量湍流流场时选择合适的散射粒子的问题。试验结果和理论分析表明:(1)散射粒子的特性参数是影响测速精度的重要因素;(2)在湍流度较高的流场中测量时应尽可能选择直径小、密度低、折射率大的粒子作为散射粒子,而且粒子散播的浓度要合适。
- 散射粒子 /
- 湍流流场 /
- PDA /
- 速度测量
Abstract: The technology of laser Doppler velocity measurement in fluid depends on the presence of suitable particles. How to choose the scattering particles during mea-suring turbulent flow field with particle dynamic analyzer(PDA)is discussed in this pa-per.The results show:(1)The choice of scattering particle is the main factor of influe-ncing the velocity measurement;(2)In the study of turbulent flow field by PDA,the requirements of scattering particle choice are mainly small size,low particle density,high particle refractive index and suitable concentration.
- scattering particles /
- turbulent flow field /
- PDA /
- velocity measure-ment