【摘要】：階梯滑行水流具有較強的紊動特征和復(fù)雜的水—氣自由面,其數(shù)值模擬研究具有較高的難度。文中采用數(shù)值模擬方法對階梯溢流壩的溢流過程與滑行水流的摻氣過程進(jìn)行研究,并探討其摻氣機理。采用體積分?jǐn)?shù)(VOF)多相流模型和大渦模擬(LES)方法,對坡度為2.5∶-1的階梯溢流壩模型進(jìn)行計算。結(jié)果表明,計算結(jié)果與實驗結(jié)果較為吻合,數(shù)值模型可靠,且能夠生動地模擬階梯溢流過程和摻氣過程。進(jìn)一步分析得出結(jié)論:足夠大的湍動能和渦結(jié)構(gòu)發(fā)展是自由面變形繼而發(fā)生自摻氣的內(nèi)部原因。
[Abstract]:Because of the strong turbulent characteristics and the complicated free surface of water and gas, the numerical simulation of step glide flow is difficult. In this paper, numerical simulation method is used to study the overflow process of stepped spillway dam and the aeration process of sliding flow, and the aeration mechanism is discussed. By using the volume fraction (VOF) multiphase flow model and the large eddy simulation (LES) method, the stepped overflow dam model with a slope of 2.5: -1 is calculated. The results show that the calculated results are in good agreement with the experimental results and the numerical model is reliable and can vividly simulate the stepped overflow process and the aeration process. It is concluded that sufficient turbulent kinetic energy and the development of vortex structure are the internal causes of free surface deformation and self-aeration.
【作者單位】： 中山大學(xué)工學(xué)院;
【基金】：廣東省協(xié)同創(chuàng)新與平臺環(huán)境建設(shè)專項項目(2014B090904066) 廣東省公益研究與能力建設(shè)專項項目(2015A020216008,2016A010104006)
【分類號】：TV135.2

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