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为了揭示空腔旋流内部的压强特性,以公伯峡水平旋流消能工为例,采用理论分析、试验研究和数值模拟相结合的方法,基于组合涡运动规律对起旋室和旋流洞内空腔旋流的压强特性进行了研究.压强分布通过压强等值线和径向压强分布图直观地体现出来,其沿径向分布基本符合组合涡流场的理论压强分布规律.提出了采用组合涡指数n刻画空腔旋流内部微观流动的思想,根据n值大小将起旋室内的空腔旋流分为准强制涡和准自由涡区域.旋流洞0+233.50m和0+238.67m断面上的空腔旋流以准强制涡运动为主,旋流洞0+243.84m和0+249.00m断面上的空腔旋流沿径向呈现由准强制涡向准自由涡转变的趋势,建立并验证了相应的压强表达式.
In order to reveal the pressure characteristics inside the cavity swirling flow, taking the horizontal swirling energy dissipator of Gongboxia as an example, the method of theoretical analysis, experimental research and numerical simulation are combined to study the influence of the swirl chamber The pressure characteristics of swirl flow in cavity are studied.The pressure distribution is directly visualized by pressure contour and radial pressure distribution.The radial distribution of pressure distribution is basically in accordance with the theoretical pressure distribution law of combined eddy current field.It is proposed that According to the value of n, the cavity swirling in the spin chamber is divided into the quasi-forced vortex and the quasi-free vortex area. The swirl holes 0 +233.50m and 0 + 238.67 The vortex flow in cavity m is dominated by quasi-forced vortex. The vortex flow in the 0 + 243.84m and 0 + 249.00m sections of the vortex flows in a radial direction from quasi-forced vortex to quasi-free vortex , Established and verified the corresponding pressure expression.