多相流试验环道的水力摩阻系数评价

Friction Factor in A Multiphase Flow Test Loop

对石油大学(北京)多相流试验环道测试段进行了标定,在水力光滑区,当雷诺数大于0.3Re_1(Re_1为光滑区与混合摩擦区的临界雷诺数)后,发现现有光滑管摩阻系数公式的计算值与实测值误差一般在5％～16.7％之间,误差随雷诺数的增大而单调增加,已不适用精密试验环道的水力计算,而考虑管壁粗糙度的Colebrook公式能很好地拟合试验数据。对几个常用的光滑管摩阻系数公式进行了分析与评价,提出了这些公式的合理使用范围。

Calibration experiments are done on multiphase flow loop using water and air separately. Experimental data have been used to calculate the wall friction factors in the test section. It is found that the Prandtle, Miller and Blasius equations all are not valid in the smooth pipe when the Reynolds numbers are more than 0. 3 Re1(the Re1 is the upper limit of smooth flow) because there are errors from 5% to 16. 7% between friction factors computed by experimental data and above equations. It is also found that the friction factors obtained by experiment data could be modeled more precisely by the Colebrook equation with a wall roughness of 0. 018 mm. Analysis and evaluation are made for above equations and their valid ranges for accurate hydraulic calculations are advised.