非恒定摩阻的TVD格式数值模拟水击衰减研究

发布时间：2018-03-21 02:34

本文选题：非恒定摩阻　切入点：TVD格式　出处：《水力发电学报》2017年03期 　论文类型：期刊论文

【摘要】：传统拟恒定摩阻模型的TVD格式虽能精确捕捉水击压力峰值,但无法准确描述水击波衰减和畸变过程,这对管线设计及管理十分不利,因此考虑非恒定摩阻的TVD格式值得深入研究。本文基于Brunone的IAB经验摩阻模型,结合Sweby的TVD格式给出了一维水击方程新的数值解法,将其运用到经典模型试验和工程实例中,并与传统拟恒定摩阻模型TVD格式和非恒定摩阻模型的特征线法的模拟效果进行对比分析。计算结果表明:考虑非恒定摩阻的TVD格式可以更加准确地捕捉水击波各周期压力峰值衰减和畸变的全过程,且模拟偏差随时间增加无增大趋势。其中各周期压力峰值捕捉误差不超过3%,相位偏移不超过0.5弧度,计算精度显著提高。该模型计算耗时和传统模型相差不大,具有良好的工程应用潜力和研究价值。
[Abstract]:Although the TVD scheme of the traditional quasi-constant friction model can accurately capture the peak value of water hammer pressure, it can not accurately describe the attenuation and distortion process of water hammer wave, which is very disadvantageous to the pipeline design and management. In this paper, based on Brunone's IAB empirical friction model and Sweby's TVD scheme, a new numerical solution to one-dimensional water hammer equation is presented, which is applied to classical model tests and engineering examples. The simulation results are compared with that of the traditional quasi-constant friction model TVD scheme and the characteristic line method of the unsteady friction model. The results show that the TVD scheme with unsteady frictional resistance can capture water hammer waves more accurately. The whole process of peak attenuation and distortion of periodic pressure, Moreover, the simulation deviation does not increase with time. The peak pressure capture error of each period is less than 3, the phase deviation is less than 0.5 Radian, and the calculation accuracy is improved significantly. The time consuming of the model is not different from that of the traditional model, and the calculation time of the model is similar to that of the traditional model. It has good engineering application potential and research value.
【作者单位】：西北农林科技大学水利与建筑工程学院;
【分类号】：TV134.1

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