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工程科学与技术:2016,48(Z2):13-19
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出口面积对有压弯管壁面压强及空化特性影响研究
(四川大学水力学与山区河流开发保护国家重点实验室)
Investigating on Wall Pressure and Cavitation Characteristics of Bending Tube Flow under Different Area of Outlet
(State Key Laboratory of Hydraulics and Mountain River Engineering)
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投稿时间:2015-08-29    修订日期:2016-03-18
中文摘要: 高流速有压弯曲管道流动往往会出现壁面负压、空化等水力学问题。本文结合卡基娃水电站生态流量放水管工程,采用模型试验、数值模拟及理论分析方法,研究了出口面积对有压弯管壁面压强及空化特性的影响。试验结果表明:出口面积较大时,弯管内存在较大的负压,在高水位时,弯管段水流空化数小于初生空化数;当出口面积缩小为原面积的81.6%时,在不同水位下,弯管内水流空化数增大了2~4倍,弯管在各水位时水流空化数均大于初生空化数;基于能量方程,建立了有压弯管水流空化数的理论计算方法,计算结果与模型试验及数值模拟结果吻合良好。
中文关键词: 弯曲管道  壁面压强  空化  空化数  数值模拟
Abstract:In order to solve hydraulic problems such as low pressure, cavitation, etc in high velocity bending duct .This paper was based on the Kajiwa hydropower station ecological flow discharge duct, used model test, numerical simulation and theoretical analysis method to find out the influence of outlet area on the wall pressure and flow cavitation number in high speed bending duct. The experimental results showed that: When the outlet area was large, pressure in the bending duct is low. In high water head, the bending duct's flow cavitation number is lower than the cavitation incipient number; When diminished the outlet size to 81.6% of the original area, under different water head, cavitation number of the bending duct increased 2 ~ 4 times, made the duct 's cavitation number higher than the cavitation incipient number in different water head; Based on the energy equation, theoretical method for calculating the cavitation number of the bending duct flow was obtained, the calculated results were in good agreement with those obtained in the model test and numerical simulation.
文章编号:201500859     中图分类号:    文献标志码:
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史润泽,田忠,范强.出口面积对有压弯管壁面压强及空化特性影响研究[J].工程科学与技术,2016,48(Z2):13-19.
SHI Runze,TIAN Zhong,FAN Qiang.Investigating on Wall Pressure and Cavitation Characteristics of Bending Tube Flow under Different Area of Outlet[J].Advanced Engineering Sciences,2016,48(Z2):13-19.