基于分离转捩模型的轴流式止回阀减阻试验研究
发布时间：2018-11-05 18:49
【摘要】：为了对轴流式止回阀门结构进行优化,采用RNG k-ε模型、转捩SST、转捩K-Kl-ω共3种模型对钝体绕流的边界层分离状态及壁面摩擦阻力进行数值计算,并与试验数据进行对比.结果表明:3种模型均能对边界层分离状况进行正确模拟,其中转捩K-Kl-ω模型计算出的旋涡形状与试验结果更为接近;传统的RNG k-ε模型不能反映转捩过程及转捩前后壁面摩擦阻力的变化,但建立在湍流度经验理论之上的转捩SST、转捩K-Kl-ω这2种模型均能计算出转捩所引起阻力变化情况,且2种模型的计算结果与试验结果一致,并将数值计算的流阻系数与实测数据进行比对,其中转捩K-Kl-ω模型计算所得到的阀门流阻系数相对误差为7%,比传统的RNG k-ε模型更为准确.在验证计算模型可靠性的基础之上,利用转捩K-Kl-ω模型对轴流式止回阀的结构进行了优化,发现光滑渐扩型流道的减阻效果最佳.
[Abstract]:In order to optimize the structure of axial flow check valve, RNG k- 蔚 model and transition SST, transition K-Kl- 蠅 model are used to calculate the boundary layer separation state and wall friction resistance of blunt body. And compared with the test data. The results show that the boundary layer separation can be simulated correctly by the three models, and the vortex shape calculated by the transition K-Kl- 蠅 model is closer to the experimental results. The traditional RNG k- 蔚 model can not reflect the transition process and the change of friction resistance of the wall before and after the transition, but the transition SST, is based on the empirical theory of turbulence. The two models of transition K-Kl- 蠅 can calculate the change of resistance caused by transition, and the calculated results of the two models are in agreement with the experimental results, and the flow resistance coefficient calculated by numerical method is compared with the measured data. The relative error of the flow resistance coefficient of the valve calculated by the transition K-Kl- 蠅 model is 7, which is more accurate than the traditional RNG k- 蔚 model. On the basis of verifying the reliability of the calculation model, the structure of axial flow check valve is optimized by using the transition K-Kl- 蠅 model. It is found that the drag reduction effect of smooth gradual expansion channel is the best.
【作者单位】： 兰州理工大学石油化工学院;福建省特种设备检验研究院;
【基金】：国家自然科学基金资助项目(51076061) 国家质量监督检验检疫总局科技计划项目(2014QK035)
【分类号】：TH134
本文编号：2313033
[Abstract]:In order to optimize the structure of axial flow check valve, RNG k- 蔚 model and transition SST, transition K-Kl- 蠅 model are used to calculate the boundary layer separation state and wall friction resistance of blunt body. And compared with the test data. The results show that the boundary layer separation can be simulated correctly by the three models, and the vortex shape calculated by the transition K-Kl- 蠅 model is closer to the experimental results. The traditional RNG k- 蔚 model can not reflect the transition process and the change of friction resistance of the wall before and after the transition, but the transition SST, is based on the empirical theory of turbulence. The two models of transition K-Kl- 蠅 can calculate the change of resistance caused by transition, and the calculated results of the two models are in agreement with the experimental results, and the flow resistance coefficient calculated by numerical method is compared with the measured data. The relative error of the flow resistance coefficient of the valve calculated by the transition K-Kl- 蠅 model is 7, which is more accurate than the traditional RNG k- 蔚 model. On the basis of verifying the reliability of the calculation model, the structure of axial flow check valve is optimized by using the transition K-Kl- 蠅 model. It is found that the drag reduction effect of smooth gradual expansion channel is the best.
【作者单位】： 兰州理工大学石油化工学院;福建省特种设备检验研究院;
【基金】：国家自然科学基金资助项目(51076061) 国家质量监督检验检疫总局科技计划项目(2014QK035)
【分类号】：TH134
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1 王明杰;雷志军;朱俊强;;压气机叶片附面层转捩的试验研究[J];工程热物理学报;2008年03期
，本文编号：2313033
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