| 基于TFM模型的滞留气团数值模拟方法及PIV试验研究 |
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| 引用本文： | 罗爽,陈奇,刘霞,蒋劲,彭宇.基于TFM模型的滞留气团数值模拟方法及PIV试验研究[J].排灌机械工程学报,2023,41(1):50-55. |
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| 作者姓名： | 罗爽 陈奇 刘霞 蒋劲 彭宇 |
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| 作者单位： | 1. 武汉大学动力与机械学院, 湖北 武汉 430072; 2. 湖北省水利水电科学研究院, 湖北 武汉 430070; 3. 湖北省水利水电科技推广中心, 湖北 武汉 430070 |
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| 摘 要： | 为了研究有压输水管路局部高点处滞流气团的运动特性,寻求更为有效的数值模拟方法,基于双流体模型(TFM)构建滞流气团的两相瞬时流场,并与VOF模型的预测结果进行对比分析.通过粒子图像测速系统(PIV)对滞流气团局部流场的速度分布进行测量,进一步验证前期构建数值模拟方法的合理性.结果表明:局部高点气团随水流下倾运动中,气团前端水流极大的速度梯度使区域流态紊乱导致气团表面张力无法维持气团形状而发生破碎;VOF模型无法模拟气液两相的相对运动,其预测出的气团运动速度要明显大于实际值;而TFM模型充分考虑了相间动量传递和相对速度的影响,能够更准确地预测滞流气团的流场速度分布和运动特性.
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| 关 键 词： | 粒子图像测速 滞留气团 计算流体动力学 双流体模型 多相流 |
| 收稿时间： | 2021-03-05 |
Numerical simulation investigation of entrapped air pocket based on TFM model and PIV test research |
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| LUO Shuang,CHEN Qi,LIU Xia,JIANG Jin,PENG Yu.Numerical simulation investigation of entrapped air pocket based on TFM model and PIV test research[J].Journal of Drainage and Irrigation Machinery Engineering,2023,41(1):50-55. |
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| Authors: | LUO Shuang CHEN Qi LIU Xia JIANG Jin PENG Yu |
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| Institution: | 1. College of Power and Machinery, Hubei University, Wuhan, Hubei 430072, China; 2. Hubei Water Resources Research Institute, Wuhan, Hubei 430070, China; 3. Hubei Water Resources Technology Promotion Center, Wuhan, Hubei 430070, China |
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| Abstract: | In order to investigate the dynamics characteristics of entrapped air pocket in the summit of hydraulic pipeline, a more effective numerical simulation method is sought. The multiphase flow field of entrapped air pocket has been established by the two-fluid model(TFM), and the analysis has been conducted by compared with the prediction results of VOF model. In addition, the velocity distribution of the air pocket′s local flow field has been measured by the particle image velocimetry system(PIV). Thus, the rationality of the simulation method can be verified. The results indicated that: In the process of the entrapped air pocket moving downward with the flow, the great flow velocity gradient at the front of the entrapped air pocket makes the regional flow pattern disordered, leading to the failure of the surface tension of the entrapped air pocket to maintain its shape and then breakage occurs. VOF model cannot simulate the relative motion of gas and liquid phase, the predicted speed of the air pocket was significantly larger than the actual value.The TFM model fully considers the influence of momentum transfer and relative velocity between gas and liquid, which can accurately predict the dynamics beha-vior of air pocket and velocity distribution of flow field. In conclusion, compared with the VOF model, the TFM model can provide more reasonable prediction results. |
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| Keywords: | particle image velocimetry entrapped air pocket CFD two-fluid model multiphase flow |
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