摘要
本文通过选择激光测速仪信号处理器ＢＳＡ和Ｃｏｕｎｔｅｒ中的增益、高压和“门限”（ＯｖｅｒｓｉｚｅＲｅｊｅｃｔＬｅｖｅｌ）的取值范围，用调节和控制速度多普勒信号幅值（电压）的方法，对自掺气射流冲击水垫塘后，塘内射流主区及扩散区中气泡及清水的时均速度和脉动速度进行了实测。结果表明，在掺气减速流中，气泡的时均速度普遍小于清水速度，而气泡的脉动速度及紊流度却大于清水相应值。
The distribution of mean velocity and fluctuated velocity of water and bulbs in a plunging pool with aerated jet are obtained by selecting and adjusting the gain、the high voltage and the oversize reject level in the single processor of LDA,as well as controlling the amplitude voltage of laser Doppler single The results show that the mean velocity of bulbs is slower than that of water but the turbulence intensity of bulbs is higher than that of water,which is in correspondence with the measured result that aeration makes the time-average pressure decreass and the pressure fluctuation increase in a plunging pool
基金
国家自然科学基金
