文丘里串联结构气泡发生器气液混合和发泡特性试验

郭云霞; 蔡小垒; 李爽; 邢宇涵

doi:10.12153/j.issn.1674-991X.20210873

文丘里串联结构气泡发生器气液混合和发泡特性试验

doi: 10.12153/j.issn.1674-991X.20210873

郭云霞^{1, 2,},
蔡小垒^{1, 2, ,},
李爽^{1, 2},
邢宇涵^{1, 2}

1.
北京石油化工学院机械工程学院
2.
深水油气管线关键技术与装备北京市重点实验室

基金项目: 国家自然科学基金青年基金项目（51806019）；北京市百千万人才工程培养经费资助（2019A21）；北京市教育委员会科技计划一般项目（KM202110017007）；国家自然科学基金委员会联合基金项目（U20B2030）。

详细信息

作者简介:
郭云霞（2000—），女，研究方向为环保多相流高效分离技术与设备，2019311091@bipt.edu.cn

通讯作者:
蔡小垒(1987—)，男，讲师，博士，研究方向为环保多相流高效分离技术与设备，caixiaolei@bipt.edu.cn

中图分类号: X505
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出版历程
- 收稿日期: 2021-12-20

Experimental study on gas-liquid mixing and foaming characteristics of Venturi series bubble generator

GUO Yunxia^{1, 2
,},
CAI Xiaolei^{1, 2
, ,},
LI Shuang^{1, 2},
XING Yuhan^{1, 2}

1.
School of Mechanical Engineering, Beijing University of Petrochemical Technology
2.
Beijing Key Laboratory of Key Technology and Equipment for Deepwater Oil and Gas Pipelines

摘要

摘要:
高效紧凑型微细气泡发生技术和粒径调控技术是微细气泡技术大规模工业应用的前提和基础。通过CFD数值模拟手段和试验测试手段测试两级文丘里串联结构气泡发生器内气液两相混合发泡特性，并利用响应曲面法对关键结构参数进行了优化设计和交互影响分析。结果表明：对两级文丘里串联结构气泡发生器成泡粒径影响最大的参数主要是二级喉管管径，其次为一级喉管管径和二级扩张角，一级扩张角的影响最小。相同工况条件下，单级文丘里管气泡发生器所生成的气泡群中位粒径为543.64 μm，粒径小于100 μm的微细气泡数量占比为8.6%；两级文丘里管串联气泡发生器所生成的气泡中位粒径为515.99 μm，微细气泡数量占比提升至12.1%。因此，可以通过控制水流流量和改变文丘里串联数量实现气泡粒径从毫米级别到微米级别的调控。
- 微细气泡 /
- 文丘里 /
- CFD数值模拟 /
- 响应曲面法 /
- 气泡特性
Abstract:
The efficient and compact microbubble generation technology and particle size control technology are the premise and foundation of large-scale industrial application of microbubble technology. The foaming characteristics of gas-liquid two-phase mixing in two-stage Venturi series bubble generator were studied employing CFD numerical simulation and experimental test, the key structural parameters were optimized, and the interactions were analyzed by Response Surface Method. The results showed that the diameter of the throat in the second stage had the greatest influence on the bubble particle size of the two-stage Venturi series bubble generator, followed by the diameter of the throat in the first stage and the second stage expansion angle, while the expansion angle in the first stage had the least influence. Under the same working conditions, the median particle size of bubbles generated by single-stage Venturi bubble generator was 543.64 μm, and the proportion of fine bubbles with particle size less than 100 μm was 8.6%. The median particle size of bubbles generated by two-stage Venturi series bubble generator was 515.99 μm, and the proportion of fine bubbles increased to 12.1%. Thus by controlling the flow rate and changing the number of Venturis in series, the bubble particle size could be adjusted from millimeter level to micron level.
- fine bubble /
- Venturi /
- CFD numerical simulation /
- response surface method /
- bubble characteristics

HTML全文

图 1 两级文丘里串联结构气泡发生器工作原理示意

Figure 1. Schematic of working principle of two-stage Venturi series bubble generator

下载: 全尺寸图片幻灯片

图 2 气泡发生器气液混合试验测试流程

Figure 2. Test flow of gas-liquid mixture experiment of bubble generator

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图 3 高速相机拍摄尺度及图像处理示例

Figure 3. Example of shooting scale and image processing by high speed camera

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图 4 文丘里串联结构气泡发生器流域几何建模及网格划分示意

Figure 4. Schematic of watershed geometric modelling and grid division of Venturi series bubble generator

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图 5 响应曲面法中回归拟合模型预测精度

Figure 5. Prediction accuracy of regression fitting model in response surface method

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图 6 响应曲面法中关键结构参数交互影响成泡效果趋势

Figure 6. Bubble forming trend of interaction of key structural parameters in response surface method

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图 7 气液两相射流过程中气泡破碎与子气泡形成过程

Figure 7. Bubble breakage and sub-bubble formation in gas-liquid two-phase jet process

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图 8 单级和两级文丘里串联结构气泡发生器成泡效果

Figure 8. Bubble forming effect of single-stage and two-stage Venturi series bubble generator

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图 9 水流流量对气泡发生器成泡效果的影响

Figure 9. Influence of flow rate on bubble forming effect of bubble generator

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表 1 两级文丘里串联结构气泡发生器关键结构参数尺寸

Table 1. Dimensions of key structural parameters of two-stage Venturi series bubble generator

主要参数	尺寸	主要参数	尺寸
入水口管径/mm	25	注气口直径/mm	8
喉管直径/mm	10	收缩管段角度/（°）	22.5
扩散管段角度/（°）	12	外壁厚度/mm	0.277

下载: 导出CSV

表 2 响应曲面法模拟因子和水平

Table 2. Simulation factors and levels of response surface methodology

因子	水平
因子	1	0	−1
一级喉管管径/mm	13	9	5
一级扩张角/（°）	15	11	7
二级喉管管径/mm	13	9	5
二级扩张角/（°）	15	11	7

下载: 导出CSV

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