中国空间站燃烧科学实验系统PIV单元地面试验

中国空间站燃烧科学实验系统是用于开展微重力燃烧实验研究的综合性科学实验平台，可以实现燃烧流场测量。为了验证燃烧科学实验系统粒子图像测速(PIV)单元对燃烧流场测量的功能与可行性，本文基于与在轨状态一致的连续激光器和相机的空间布局，搭建了地面层流圆孔射流试验平台，选取Al₂O_3，TiO_2，ZrO₂三种示踪粒子进行冷态试验与热态试验。试验结果表明，自主研制Nd∶YVO₄泵浦连续激光器偏光角度合适，能照亮被测流场主流区域，燃烧科学实验系统PIV单元可用于低速燃烧流场测量；相同工况下，Al₂O₃粒子在冷态试验测量的速度值更接近于理论值，速度幅值比更接近1，更适用于低速流体测量。 

Ground Experiment Investigation of PIV Unit for Combustion Science Experimental System of China Space Station

The Combustion Science Experimental System of China Space Station is a comprehensive scientific platform for microgravity combustion experiment research, which is feasible for velocity measurement. In order to test the feasibility function of Particle Image Velocimetry (PIV), an experimental platform for laminar circular orifice jet, which has the same spatial layout of the laser and camera as that in-orbit operation, was built for reacting flow field and non-reacting flow field experiment. Al₂O₃, TiO₂ and ZrO₂ were selected as tracer particles. The experimental results indicate that the combustion science experimental system of PIV unit is feasible for low-speed combustion field measurement. Under the same conditions, the obtained velocities by using Al₂O₃ particles are closer to analytical values with velocity amplitude ratio nearest to 1, which suggests that Al₂O₃ particles are more suitable for low-speed field. The present study can provide the selection basis for particle species in ground-space comparison experiments.