激光在小尺度湍流场中的透射功率模型

Transmission Power Model of Laser in Small Scale Turbulent Field

摘要:

从激光在小尺度湍流场中的透射特性出发，对螺旋桨扰动粒子湍流场进行了模拟仿真，结果显示在距离螺旋桨较远的区域，存在尺度较大的涡旋结构；分析小尺度湍流场中粒子浓度时空变化情况，建立了小尺度湍流场中激光透射模型，并对理论模型进行了水池实验验证。实验显示：大尺度涡旋结构导致粒子浓度在距离螺旋桨较远的湍流区域比较近的区域变化更加剧烈；最终，从螺旋桨扰动流场导致粒子重新分布引起激光透射功率改变的角度，建立了激光在小尺度湍流场中的透射功率模型。

关键词:小尺度湍流场;激光;透射模型;水池实验

Abstract:

In this paper，based on the transmission characteristics of laser in small scale turbulent field，the turbulent flow field of propeller disturbed particles is simulated. The results show that there is a large scale vortex structure in the region far from the propeller；The temporal and spatial variation of particle concentration in small scale turbulence field is analyzed，the laser transmission model in small scale turbulence field is established，and the theoretical model is verified by pool experiment，which shows that the large scale vortex structure causes the particle concentration to change more violently in the region closer to the turbulent region far from the propeller. Finally，the transmission power model of the laser in the small-scale turbulent field is established，based on the change of the laser transmission power caused by the redistribution of the particles in the turbulent flow field of the propeller.

Key words:small scale turbulent field;laser;transmission power model;water tank experiment