Chemical Industry and Engineering Progress ›› 2021, Vol. 40 ›› Issue (5): 2389-2400.DOI: 10.16085/j.issn.1000-6613.2020-1257

• Chemical processes and equipment • Previous Articles     Next Articles

Validation of flow regime prediction model and differences of velocity component selection for rotating flow field

WANG Yan1(), CAO Zhikang1, WANG Yingyao1, HU Qiong1(), HU Peng1, XIAO Yexiang2   

  1. 1.School of Mechanical Engineering, Jiangsu Ocean University, Lianyungang 222005, Jiangsu, China
    2.State Key Laboratory of Hydroscience and Engineering & Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
  • Received:2020-08-08 Online:2021-05-24 Published:2021-05-06
  • Contact: HU Qiong

旋转流场流态预测模型验证及其速度分量选择的差异性

王衍1(), 曹志康1, 王英尧1, 胡琼1(), 胡鹏1, 肖业祥2   

  1. 1.江苏海洋大学机械工程学院,江苏 连云港 222005
    2.清华大学水沙科学与水利水电工程国家重点实验室&能源与动力工程系,北京 100084
  • 通讯作者: 胡琼
  • 作者简介:王衍(1989—),男,博士,副教授,研究方向为流体机械与密封技术。E-mail:qqwangyan2006@163.com
  • 基金资助:
    国家自然科学基金(51805199);国家重点研发计划(2017YFC0404200);江苏省自然科学基金(BK20191471);江苏省高校“青蓝工程”;江苏“六大人才高峰”项目(GDZB-076);江苏省高等学校自然科学研究面上项目(19KJB460010);江苏海洋大学人才引进科研基金(KQ19004);2020年江苏省研究生科研与实践创新计划(KYCX20-2910)

Abstract:

In view of the problems of inconsistent criteria for determining fluid flow regime and poor agreement of prediction models in high-speed rotating flow field, according to the basic principles of fluid mechanics and the determination methods of pipe and clearance flow field, the classical one-dimensional Reynolds number and two-dimensional flow factor prediction models are reconstructed theoretically. Meanwhile, an ellipsoid determination model suitable for determining and predicting fluid flow regime in rotating flow field is proposed. Firstly, according to the classical Reynolds number model and flow factor model, the simulation calculation method and ellipsoid model are theoretically verified. Secondly, the velocity field under different media and working condition parameters is analyzed, and the results are compared with the relevant literature. Finally, the rationality and scientific of the ellipsoid model are demonstrated based on the theoretical analysis of the turning point in the rotating flow field. The selection of velocity components in the model and the differences produced are discussed. The results show that the prediction results of the pipe flow based on the ellipsoid model are completely consistent with the classical Reynolds number model, and the predicted values of the transition point in the rotating flow field by the new model is obviously lower than that of the traditional model, which is closer to the actual working condition. When determining the flow regime of the rotating flow field according to the ellipsoid model, the linear velocity at average diameter should be selected for average shear velocity, the average value of inlet and outlet radial velocity for radial average velocity and the maximum axial velocity for the input factors of the model. The proposed ellipsoid model provides a new idea and method for determining the flow regime scientifically in the theoretical calculation of rotating flow field.

Key words: rotating flow field, flow regime, model validation, velocity component, difference

摘要:

鉴于目前高速旋流场中的流体流态判定准则不统一、预测模型契合度不高的问题,依据流体力学基本原理及管道、缝隙流场的判定方法,本文对经典一维雷诺数及二维流量因子预测模型进行了理论重构,并尝试提出了适用于旋转流场中流体流态判定和预测的椭球模型。文章首先根据经典雷诺数模型和流动因子模型,对仿真计算和椭球模型进行了理论验证;然后对不同介质和工况参数下的速度场进行了分析计算,并与相关文献进行对比研究;最后结合对旋转流场中拐点的理论剖析,对椭球模型的合理性和科学性进行了论证,并对模型中速度分量的选择及差异性进行了讨论。结果表明:椭球模型对管道流动的预测结果与经典雷诺数模型完全一致,新模型对旋转流场中转折点的预测值较传统模型明显偏低,与实际工况更加贴近;根据椭球模型进行旋转流场的流态判定时,应选择平均直径处的线速度为剪切平均速度、进出口径向速度平均值为径向平均速度及最大轴向速度为模型输入因子。椭球模型的提出,为旋转流场在理论计算时如何科学判定流体流态提供了新的思路和判定方法。

关键词: 旋转流场, 流态, 模型验证, 速度分量, 差异性

CLC Number: 

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