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中文摘要：
在常温、常压条件下,对竖直3×3棒束通道内定位格架的单相及两相局部阻力特性进行了实验研究。单相流动实验时,水雷诺数的变化范围为290-18 007;两相实验时,气相、液相表观速度变化范围分别为0.013-3.763m/s和0.076-1.792m/s。利用单相实验数据得到的定位格架局部阻力系数计算关系式,用两相实验数据对均相流模型中8种不同的两相等效黏度计算方法进行了评价。Re1〈9000时,Dukler模型的预测效果最好;Re1≥9000时,McAdams计算方法预测效果最好;基于所有数据,Dukler模型的计算值与实验值吻合最好,平均相对误差为29.03%。考虑了质量含气率、两相雷诺数及气液相密度的影响,对Re1〈9000时的实验数据进行了拟合,得到的经验关系式的计算值与实验值符合较好。
英文摘要：
The experimental study on local resistance of single-phase and two-phase flows through a spacer grid in a vertical channel with 3×3rod bundle was carried out under the normal temperature and pressure.For the case of single-phase flow,the liquid Reynolds number covered the range of 290-18 007.For the case of two-phase flow,the ranges of gas and liquid superficial velocities were 0.013-3.763m/s and 0.076-1.792m/s,respectively.A correlation for predicting local resistance of single-phase flow was given based on experimental results.Eight classical two-phase viscosity formulae for homogeneous model were evaluated against the experimental data of two-phase flow.The results show that Dukler model predicts the experimental data well in the range of Re1〈9000 while McAdams correlation is the best one for Rel≥9 000.For all experimental data,Dukler model provides the best prediction with the mean relative error of 29.03%.A new correlation is fitted for the range of Re1〈9000 by considering mass quality,twophase Reynolds number and liquid and gas densities,resulting in a good agreement with the experimental data.
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