气-液两相流横掠圆柱表面脉动压力特性的研究

Study on the characteristics of the fluctuating pressure for gas-liquid two-phase flow across the circular cylinder surface

对垂直上升矩形截面管内气一液两相流绕水平布置的圆柱流动时圆柱表面的脉动压力特性进行了试验研究，试验中来流雷诺数的范围为4．4×10^3～1．04×10^4，截面含气率的范围为0～0．06。在功率谱图上得出了圆柱表面脉动压力随含气率、雷诺数及测量角度的变化规律。试验结果表明，在该试验范围内，随着含气率增大，圆柱表面的脉动压力功率谱图峰值逐渐降低，而所对应的漩涡脱落频率增大；圆柱不同角度对功率谱特性有一定影响；雷诺数对功率谱特性的影响相对较小。

Work is concerned with pressure distribution of the vertically upward circular cylinder under gas-liquid two-phase cross flow. The characteristics of pressure distribution of a circular cylinder are found in power spectrogram when void fraction . Reynolds and the angles measured are changed. Fluctuating lift data are obtained for Reynolds number varying from 4.4×10^3 to 1.04×10^4 ,and void fraction in the main flow ranged from 0 to 0. 06. The results indicate that, in its range, the peak value in the power spectrogram for the cylinder are gradually reduce as the void fraction increased, while the correspond frequency of the turbulent falling off is increased. The different angles of the circular cylinder have some influence on power spectrogram characteristics, but the Reynolds number have little flu- ence.