流体机械

2016, v.44;No.526(04) 17-22

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水平管内以叶轮起旋的螺旋流的数值模拟
Numerical Simulation of Swirl Flow Rotated by the Vane in the Horizontal Pipe

饶永超;郑亚星;王树立;赵书华;魏鸣姣;杨敏官;周飞龙;
RAO Yong-chao;ZHENG Ya-xing;WANG Shu-li;ZHAO Shu-hua;WEI Ming-jiao;YANG Min-guan;ZHOU Fei-long;Jiangsu Key Laboratory of Oil and Gas Storage and Transportation Technology,Changzhou University;Changzhou University;Jiangsu University;Sinopec nanjing engineering co.,LTD;

摘要(Abstract):

采用RNG k-ε模型对水平管内以叶轮起旋的螺旋流的流动特性进行了数值模拟研究,通过试验验证了数学模型的准确性和可靠性。研究结果表明:叶片旋流器产生的旋流场,切向速度分布具有近似Rankine组合涡结构的特点,径向速度最大值达轴向速度的0.5倍。雷诺数对旋流强度影响较大,Re数越大,旋流强度越大,且旋流强度的衰减速率越小。强旋流使轴向逆压力梯度足够大而引发轴向回流,从而产生了中心回流区域;能够增加反应介质的滞留时间,提高气液两相的传质和传热效率,促进水合物浆体快速生成,保障管道安全输送。
The flow characteristics of swirl flow rotated by the vane in the horizontal pipe was numerically simulated using RNG k- ε model. The numerical results were in good agreements with the experimental data verifying the accuracy and reliability of our developed mathematical model. The results showed that the tangential velocity distribution of swirl flow field rotated by the vane was similar to approximate Rankine vortex structure,and the maximum of radial velocity was that axial velocity 0. 5 times. The Reynolds number had a great influence on swirl intensity. The swirl intensity would increase,and swirl intensity attenuation rate decrease,when Re number increased. Strong swirl flow make axial backflow caused by large inverse pressure gradient,and the center backflow area would appear. The center backflow area increased the residence time of reaction medium,and improved the gas liquid two phase mass transfer and heat transfer efficiency,and promoted the hydrate slurry quickly generate,which ensured the safety of pipeline transport.

关键词(KeyWords): 螺旋流;叶轮;RNG k-ε模型;数值模拟
swirl flow;vane;RNG k-ε model;numerical simulation

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基金项目(Foundation): 国家自然科学基金项目(51574045)

作者(Author): 饶永超;郑亚星;王树立;赵书华;魏鸣姣;杨敏官;周飞龙;
RAO Yong-chao;ZHENG Ya-xing;WANG Shu-li;ZHAO Shu-hua;WEI Ming-jiao;YANG Min-guan;ZHOU Fei-long;Jiangsu Key Laboratory of Oil and Gas Storage and Transportation Technology,Changzhou University;Changzhou University;Jiangsu University;Sinopec nanjing engineering co.,LTD;

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