提升管内多股交叉射流的数值模拟

Numerical simulation of multiple cross jet in riser

在内径为186 mm的提升管冷模装置上,对单个及两个喷口横截面为40 mm×10 mm的矩形喷嘴,采用k-ε双方程湍动模型,通过对喷嘴出口边界条件的修正,进行了气相流动的数值模拟。射流气速为41.67 m/s,提升管底部来流气速为7.16 m/s。模拟结果显示,射流影响区约在喷嘴上方1.4 m处结束,根据射流流体在提升管内的流动形态,沿轴向可将其分为核心区,偏折区和发展区;射流的外轮廓为瓮形。模拟结果与实验结果相吻合。

Using k-ε turbulent model, the numerical simulation ot gas flow was carried out on the riser cold model installation with inside diameter of 186 mrn by the modification of the boundary conditions of jet outlet. The lateral section of the injection nozzle is rectangle with 40 mm×10mm. The gas jet velocity is 41.67 m/s with pre-lifting gas velocity of 7.16m/s. The result shows that the jet influential zone terminates at 1.4 m above the injection. It is found that the whole injection zone can be divided into three regions, that is, core region, deflection region and full developing region. And the configuration of the jet is urn-shaped. The simulation results agree well with the experimental results.