皮托管、热线流速仪作为风洞标准器,会对流场产生干扰,LDV由于其非接触测量、线性范围宽等特点,用于风洞流场和流速测量有着独有的优势.就示踪粒子数率对LDV流速测量结果的影响设计了相关实验,比较不同示踪粒子数率在不同流速点对测量结果的影响.实验结果表明粒子数率过低时会带来较大的随机误差,造成示值重复性差.为保证测量结果的可靠性,建议LDV作为风洞标准器进行风速测量时粒子数率不低于200 Hz.
The research of influence on tracer particle data rate base on the flow field measurement in wind tunnel with LDV
As a standard device for wind tunnels,the pitot tube and hotwire anemometer can interfere with the flow field.Due to its non-contact measurement and wide linear range,LDV has unique advanta-ges for wind tunnel flow field and velocity measurement.Experiments were designed to investigate the in-fluence of the number rate of tracer particles on the LDV velocity measurement results,and to compare the effects of different number rates of tracer particles at different velocity points on the measurement re-sults.The experimental results show that when the number rate of particles is too low,it will bring large random errors,resulting in poor repeatability of the indicated value.To ensure the reliability of the meas-urement results,it is recommended that the number rate of particles be no less than 200 Hz when using LDV as a standard device for wind tunnel velocity measurement.
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