基于加压液化输沙技术的浑水水力分离清水装置中水沙两相三维流场数值模拟

Water-sediment Three-dimensional Flow Field Numerical Simulation Based on Pressurized Liquefied Sediment Transport Technology for Applying in Turbid Water Hydraulic Separation Device

为解决浑水水力分离清水装置因高度问题难以应用的问题,采用重整化群两方程紊流(RNGκ-ε)模型和简化的多相流混合模型,对应用加压液化输沙技术前后的浑水水力分离清水装置的水沙两相三维流场进行了数值模拟,并由FLUENT软件分析了运用加压液化输沙技术前后装置内部流场泥沙分布变化。结果表明,加压液化输沙技术在一定压力水头作用下,可避免装置锥体底部的泥沙淤积,说明该技术可解决装置由于降低锥体高度出现的底部泥沙淤积问题,为降低装置设计高度提供了理论依据。

To resolve the problem that the height of turbid water hydraulic separation device does not apply to the actual construction, improved two-equation turbulent model （RNG κ-ε）and simplified multiphase mixture model are used to simulate water-sediment three-dimensional flow field with the device. And then FLUENT software is used to analyze the sediment distribution variation of internal flow filed before and after applying the device. The results show that with a certain pressure head, the pressurized liquefied sediment technology can avoid the bottom sediment silting of the device. It demonstrates that this technology can solve the sediment silting of cone bottom device due to the height reduction, which provides a theoretical basis for reducing the height of device.