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针对现有湿喷机搅拌系统复杂、搅拌性能不理想等问题,提出了利用混凝土分配阀(以下简称S管阀)摆动角速度大的运动特性,建立一种在S管阀上安装叶片的新型搅拌结构。为了研究该新型搅拌装置的搅拌性能,借助计算流体动力学原理及欧拉-欧拉多相流模型,以空气、天然河沙和水泥净浆组成的气固液三相流为搅拌介质,在非泵送状态下,对新型搅拌装置和现有搅拌装置做自由液面下的瞬态数值模拟,研究了料斗内部的流场特征、固相颗粒分布情况及混凝土离析速率。研究结果表明,新型搅拌装置内的流动性更强、沙粒沉积量更少且混凝土离析速率更慢。
Aiming at the problems of complex mixing system and poor stirring performance of the existing wet spraying machine, a new type of stirring method of installing the blades on the S-tube valve is proposed by using the movement characteristics of large swinging angular velocity of the concrete distributing valve (hereinafter referred to as S-tube valve) structure. In order to study the agitating performance of the new stirring device, the gas-liquid-liquid three-phase flow composed of air, natural sand and cement paste was used as the stirring medium by means of computational fluid dynamics and Euler-Euler flow model. In the non-pumping state, the transient numerical simulations of the free-surface of the new stirrer and the existing stirrer were carried out. The characteristics of the flow field, the distribution of the solid particles and the segregation rate of the concrete were studied. The results show that the new agitator has better fluidity, less sand deposits and slower rate of concrete segregation.