高水头、长距离倒虹吸管水力特性及结构稳定性研究

发布时间：2018-06-28 14:07

本文选题：倒虹吸管 + 水力特性　；参考：《青海大学》2017年硕士论文

【摘要】：本文依托青海引大济湟北干二期引胜沟倒虹吸工程为背景,首先利用专业流体计算软件FLUENT对倒虹吸整体模型进行了设计工况运行条件下数值模拟,分析其水力特性,其次通过MPCCI平台建立FLUENT与ABAQUS耦合接口,利用有限元软件对倒虹吸最底部管段的三维模型进行了设计工况运行条件时的双向流固耦合计算,分析倒虹吸最底部管段的应力和应变特性。计算研究结果主要表明:(1)稳定状态时进、出口段最高水位分别为2712.8m和2705.8m,数值计算的水头损失值与理论计算结果很接近,相对误差为4.1%。(2)进水口段最大流速为9.6m/s位于进水口段排气孔位置,管轴位置流速最大为1.9m/s,向管壁附近减小至1.3m/s,倒虹吸斜管或弯管段最大流速偏离管轴心位置向下,最大压强2.72MPa位于倒虹吸最底部。(3)水位上升过程中倒虹吸2#管段顶部内存在气囊,无法自行排出,需在2#与3#管段衔接处设置综合补排气阀排气,减小管道振动。(4)倒虹吸最底部管段结构静力计算结果显示最大应力出现在镇墩与管道的衔接的边缘顶部和底部,其值为13.2MPa;最大位移出现在管道和支墩间隔的中间位置竖直向下,其值为0.0027m。(5)倒虹吸最底部管段结构双向流固耦合计算结果显示,管道在初始阶段存在强烈的振动,期间最大应力95.3MPa,最大位移0.084m,稳定后的最大应力76.4MPa,最大位移0.004m,模态分析结果表明管道最小共振频率为1.6071赫兹。
[Abstract]:In this paper, based on the inverted siphon project of Yishenggou in the second phase of Yenshenggu Project, the whole model of inverted siphon is numerically simulated under the design working condition by using professional fluid calculation software fluent, and its hydraulic characteristics are analyzed. Secondly, the coupling interface between fluent and Abaqus is established by MPCCI platform, and the three-dimensional model of inverted siphon at the bottom of pipe is calculated by using finite element software. The stress and strain characteristics of the inverted siphon at the bottom of the pipe are analyzed. The main results are as follows: (1) the maximum water level of the inlet and outlet section is 2712.8m and 2705.8m, respectively. The calculated head loss value is very close to the theoretical calculation result. The relative error is 4.1. (2) the maximum flow velocity of the inlet section is 9.6m/s located at the exhaust hole position of the inlet section, the maximum velocity of the tube axis is 1.9 m / s, and the maximum velocity of velocity decreases to 1.3 m / s near the pipe wall, and the maximum velocity of the inverted siphon tube or bend section deviates from the axis of the pipe. The maximum pressure of 2.72 MPA is located at the bottom of inverted siphon. (3) there are air bags in the top of inverted siphon 2# section during water level rise, which can not be discharged by itself. (4) the static calculation results of inverted siphon at the bottom of the pipe structure show that the maximum stress appears at the top and bottom of the junction between the piers and the pipe with a value of 13.2 MPA, and the maximum displacement appears vertically down at the middle position between the pipe and the pier. The numerical results show that there is a strong vibration in the initial stage of the pipe. The maximum stress during the period is 95.3MPa, the maximum displacement is 0.084m, the maximum stress after stabilization is 76.4MPa and the maximum displacement is 0.004m.The modal analysis results show that the minimum resonance frequency of the pipeline is 1.6071 Hz.
【学位授予单位】：青海大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV672.5

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