本文从理论和实验两方面对吹气法测量中气容和气阻的影响进行了系统研究。结果表明，气容和气阻对压力波动信号有明显的衰减作用，而对压力波动信号的延迟作用可忽略，随着气容体积的增大和气阻内径的减小，衰减作用增强；气容和气阻组合的衰减作用大于相应的单气容或单气阻，先气阻后气容组合方式的衰减作用大于先气容后气阻的衰减作用；气容和气阻的引入对吹气管出口处的气速影响不大，所以对吹气杯的设计没有影响。本文的理论与实验结果为吹气法中气容和气阻的设计应用提供了基础。%The theoretical and experimental studies about the effect of air capacity and air resistance in the air purge method were carried out .The results show that the air capacity and air resistance have obvious attenuation effect on the pressure amplitude but little effect on the phase position of the pressure wave .The attenuation effect increases with the air capacity volume increasing or the air resistance diameter decreasing .The attenuation effect of the air capacity and air resistance combination is bigger than that of a single air capacity or a single air resistance .The combination attenuation effect is big‐ger w hen the air resistance is before the air capacity .T he air capacity and air resistance have little effect on the air velocity at the entrance of the purge tube and thus have no effect on the design of the purge cup .The theoretical and experimental results in this article provide fundamental for the design and application of the air capacity and air resistance in the air purge method .
展开▼
