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定优胶溶液狭缝喷射减阻实验研究

时朋飞 杜伟 胡海豹 冯家兴 谢络

时朋飞, 杜伟, 胡海豹, 冯家兴, 谢络. 定优胶溶液狭缝喷射减阻实验研究. 力学学报, 2022, 54(5): 1257-1263 doi: 10.6052/0459-1879-21-567
引用本文: 时朋飞, 杜伟, 胡海豹, 冯家兴, 谢络. 定优胶溶液狭缝喷射减阻实验研究. 力学学报, 2022, 54(5): 1257-1263 doi: 10.6052/0459-1879-21-567
Shi Pengfei, Du Wei, Hu Haibao, Feng Jiaxing, Xie Luo. Experimental study on drag reduction characteristics of diutan gum solution by slit injection. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(5): 1257-1263 doi: 10.6052/0459-1879-21-567
Citation: Shi Pengfei, Du Wei, Hu Haibao, Feng Jiaxing, Xie Luo. Experimental study on drag reduction characteristics of diutan gum solution by slit injection. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(5): 1257-1263 doi: 10.6052/0459-1879-21-567

定优胶溶液狭缝喷射减阻实验研究

doi: 10.6052/0459-1879-21-567
基金项目: 国家自然科学基金(52071272, 12102358), 基础前沿项目(JCKY2018*18), 陕西省自然科学基础研究计划(2020JC-18), 中国博士后科学基金(2021M692617), 中央高校基本科研业务费专项资金(3102021HHZY030008)和重庆市自然科学基金(cstc2021jcyj-msxmX0393)资助
详细信息
    作者简介:

    谢络, 副教授, 主要研究方向: 水下仿生减阻. E-mail: xieluo@nwpu.edu.cn

  • 中图分类号: O357.5+4

EXPERIMENTAL STUDY ON DRAG REDUCTION CHARACTERISTICS OF DIUTAN GUM SOLUTION BY SLIT INJECTION

  • 摘要: 定优胶具有比柔性聚合物更优越的抗剪切效果, 是一种新型高分子聚合物减阻添加剂, 目前对其研究仍相对缺乏. 这里通过开展定优胶流变和管内狭缝喷射减阻实验, 分析了流变特性与减阻行为之间的联系, 并从其喷射扩散角度解释了其减阻规律变化的原因. 实验结果表明, 定优胶溶液为剪切变稀流体, 会发生黏性到弹性转变, 且转变点与温度无关, 仅随浓度增加而前移; 定优胶减阻率随水流速度(雷诺数)呈先增后降趋势, 但随喷射速率单调递增; 相较于喷射纯水, 定优胶溶液在流场中扩散缓慢, 且喷射速率越高, 壁面附近集聚越明显. 同时, 定优胶溶液喷射减阻的变化与其扩散规律相吻合: 当流速较小时, 定优胶溶液扩散不充分, 呈非均匀聚集态, 未能充分发挥其湍流抑制效果, 减阻较弱; 随流速增加, 水流的剪切拖拽作用增强了定优胶的扩散均匀程度, 进而提升湍流抑制效果, 减阻率上升; 但当流速过大时, 定优胶的快速扩散造成其浓度被大幅稀释, 且近壁区过大剪切率可能已造成部分长链分子断裂, 致使减阻效果下降.

     

  • 图  1  实验装置示意图

    Figure  1.  Schematic diagram of experimental apparatus

    图  2  流场测试光学示意图

    Figure  2.  Optical diagram of flow field test

    图  3  20 °C下不同浓度定优胶的黏度随剪切速率的变化曲线

    Figure  3.  The dependence of the apparent viscosity for diutan gum solutions on the shear rate at different concentrations with T = 20 °C

    图  4  20 °C下不同浓度定优胶的G′与G″随角频率的变化曲线

    Figure  4.  The dependence of the G′ and G″ for aqueous diutan gum on the oscillation frequency at different concentrations with T = 20 °C

    图  5  不同温度定优胶G′与G″随角频率的变化曲线

    Figure  5.  The dependence of the G′ and G″ for aqueous diutan gum on the oscillation frequency at different temperature

    图  6  20 °C下喷射速率对减阻效果的影响

    Figure  6.  Drag reduction effect with different injection rates at 20 °C

    图  7  20 °C下雷诺数对减阻效果的影响

    Figure  7.  Drag reduction effect with different Reynolds number at 20 °C

    图  8  定优胶溶液流场扩散特性

    Figure  8.  DG solution diffusion characteristics

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出版历程
  • 收稿日期:  2021-11-02
  • 录用日期:  2022-02-18
  • 网络出版日期:  2022-02-19
  • 刊出日期:  2022-05-01

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