本文選題：高含沙泄洪水流 + 孔板消能工��； 參考：《水利學報》2017年11期

【摘要】：高含沙水流特性已有較多研究,但主要針對河道中的高含沙漸變水流開展的,而對高含沙河流高壩樞紐泄洪水流荷載特性的研究較少,本文開展了孔板消能工高含沙水流的時均壓力和脈動壓力特性研究。試驗共研究了含沙量從0至300 kg/m~3,流速從1.78 m/s至3.73 m/s,共28組不同工況。結(jié)果表明:高含沙泄洪水流的時均和脈動壓力的沿程分布規(guī)律與清水相同,但幅值變化規(guī)律存在差異,相同流速條件下時均壓力幅值隨含沙量的增加而增加,而脈動壓力幅值受含沙量和流速條件的雙重影響,隨含沙量的增加呈現(xiàn)出先增加后減小的趨勢;脈動壓力概率密度分布符合正態(tài);頻率分布范圍受水流條件影響隨流速的增加而增加,其中低頻分量隨含沙量的增加而增加。根據(jù)試驗結(jié)果,提出了高含沙泄洪水流荷載計算的修正方法,該方法對于高含沙樞紐的工程設(shè)計有重要參考價值。
[Abstract]:There have been many studies on the characteristics of high sediment flow, but mainly on the gradual change of high sediment content in the river, but less on the characteristics of flood discharge flow in the high dam project of the high sediment bearing river. In this paper, the characteristics of time-averaged pressure and pulsating pressure of high sediment flow with hole plate energy dissipator are studied. The sediment content ranged from 0 to 300 kg / m ~ (3) and the flow rate ranged from 1.78 m / s to 3.73 m / s in 28 groups. The results show that the distribution of time-averaged and fluctuating pressure of high sediment discharge flow is the same as that of clear water, but the variation of amplitude is different, and the amplitude of time-averaged pressure increases with the increase of sediment content under the same flow velocity. The amplitude of pulsating pressure is affected by both sediment concentration and flow rate, and increases first and then decreases with the increase of sediment concentration, and the probability density distribution of pulsating pressure accords with normal distribution. The frequency distribution range increases with the increase of flow velocity, and the low frequency component increases with the increase of sediment content. Based on the experimental results, a modified method for calculating the flow load of flood discharge with high sediment content is put forward, which has important reference value for the engineering design of high sediment bearing project.
【作者單位】： 天津大學水利工程仿真與安全國家重點實驗室;
【基金】：國家重點研發(fā)計劃(2016YFC0401904) 國家自然科學基金項目(51579172,51409187,51509180) 天津市應(yīng)用基礎(chǔ)與前沿技術(shù)研究計劃(青年項目)(15JCQNJC07100) 國家自然基金委創(chuàng)新團隊(51621092)
【分類號】：TV143

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