3D-PDA测量2相流场时散射粒子的选择

Selection of Scattering Particles When Measuring Two-Phase Flow with 3D-PDA

应用激光技术测量流体速度时，需要合适的散射粒子。本文研究了激光三维粒子动态分析仪（3D－PDA）测量2相流场速度时，如何选择合适散射粒子的问题。研究结果表明，散射粒子的合理选择是保证测量精度的重要措施之一；测量湍流脉动较强流场时，应选用密度小、直径小、折射率大的粒子作散射粒子，并选择合适的粒子散播浓度。

The technigue of Laser Doppler velocity measurement in two phase fluid depends on sui-table particles. How to select the scattering particles in two-phase flow measurement with 3-Dimentional Particle Dynamic Analyzer (3D-PDA)is discussed in this paper. The results show that the property of scat-tering particles is a main factor affecting the velocity measurement, and those particles with smaller size,lower density and higher refractive index are highly suggested for the seeding in turbulent flow measure-ments.