【摘要】 测量了 2 0大气压下长颈管 (直径 0 6 ,1 0 ,2 0mm ,长 1 0 0～ 1 5 0 0mm)在频率为 40 ,5 0 ,6 0 ,70Hz下的交变流动的阻抗。利用试验值对小振幅声波情况下细管纯阻力和感抗的公式进行修正 ,得到大振幅声波情况下的经验公式 ,工质为氦气 ,实验在常温下进行。更多还原

【Abstract】 Experiments have been performed to investigate the oscillating flow characteristics of helium in the long neck tubes with diameters of 0 6,1 0 and 2 0 mm,at the frequencies of 40,50,60 and 70 hz The experiment system is under the pressure of 20bar and the temperature is kept the same as the outside更多还原