| 朱炎,吴晨光,袁一星,石振锋.黏弹性输水管道中含气瞬变流压力衰减分析[J].水利学报,2018,49(3):303-312 |
| 黏弹性输水管道中含气瞬变流压力衰减分析 |
| Analysis of pressure damping in air-water transient flow in viscoelastic pipes |
| 投稿时间：2017-07-17 |
| DOI：10.13243/j.cnki.slxb.20170701 |
| 中文关键词: 含气瞬变流模型 压力衰减 管壁摩擦 黏弹性效应 参数校核 |
| 英文关键词: air-water transient flow pressure damping pipe-wall friction viscoelastic effect parameter calibration |
| 基金项目:国家重点研发计划项目（2016YFC0400603）；国家自然科学基金项目（51178141） |
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| 中文摘要: |
| 基于瞬变流理论对管道漏失、堵塞等进行检测是国内外管道故障辨识的热点和前沿，但在黏弹性输水管道中由于空气的存在将影响该技术的推广应用，因此有必要对黏弹性管道中的含气瞬变流及其压力衰减畸变过程进行分析。本文首先通过装置实验验证了用含气率（α）修正波速的一维瞬变流模型的有效性，其次基于模型通过能量和傅里叶分析研究管壁摩擦和黏弹性对含气瞬变流压力衰减的影响，最后针对应用背景提出模型参数校核的建议。研究表明：当α≤ 2.37%时，由管壁摩擦引起的压力衰减速率随着α和管径壁厚比的增加而增大，而由黏弹性效应引起的压力衰减速率则相反，但两者都会随着管长的增加而变小；在对模型进行参数校核时，建议当1%≤ α ≤ 2.37%时，不必对黏弹性参数进行校核。 |
| 英文摘要: |
| Leakage or blockage detection by transient-based techniques is the hot spot and frontier of pipe fault identification in recent research. However,the existence of air makes these techniques difficult for applications in viscoelastic pipes, it is necessary to study the pressure damping and distortion of air-water transient flow in viscoelastic pipes. Firstly,an one-dimensional transient model modified by air content (α) is validated by experimental data. Furthermore, the influence of pipe-wall friction and viscoelasticity on pressure damping is studied through energy and Fourier analysis based on the validated model. Finally, a suggestion on parameter calibration is proposed according to practical application. It is concluded:when α< 2.37%, the pressure dissipation rate due to pipe-wall friction increases with the increase of α and size-thickness ratio, while the pressure dissipation rate due to pipe-wall viscoelasticity shows an inverse trend, however, both of them decrease as the pipe length increases; when calibrating the transient flow model,it is suggested that the viscoelastic parameters do not need to be corrected when 1% ≤ α ≤ 2.37%. |
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