CAJ | 학술논문

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290～18007；两相实验时，气相、液相表观速度变化范围分别为0.013～3.763 m／s和0.076～1.792 m／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。 Rel ＜9000时，Dukler模型的预测效果最好；Rel ≥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 Rel ＜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。
재상온、상압조건하，대수직3×3봉속통도내정위격가적단상급량상국부조력특성진행료실험연구。단상류동실험시，수뢰낙수적변화범위위290～18007；량상실험시，기상、액상표관속도변화범위분별위0.013～3.763 m／s화0.076～1.792 m／s。이용단상실험수거득도적정위격가국부조력계수계산관계식，용량상실험수거대균상류모형중8충불동적량상등효점도계산방법진행료평개。 Rel ＜9000시，Dukler모형적예측효과최호；Rel ≥9000시，McAdams계산방법예측효과최호；기우소유수거， Dukler모형적계산치여실험치문합최호，평균상대오차위29.03％。고필료질량함기솔、량상뢰낙수급기액상밀도적영향，대 Rel ＜9000시적실험수거진행료의합，득도적경험관계식적계산치여실험치부합교호。
The experimental study on local resistance of single‐phase and two‐phase flows through a spacer grid in a vertical channel with 3 × 3 rod 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 w ere 0.013‐3.763 m/s and 0.076‐1.792 m/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 homoge‐neous 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 Rel<9 000 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 Rel<9 000 by considering mass quality ,two‐phase Reynolds number and liquid and gas densities ,resulting in a good agreement with the experimental data .