泥沙粒径及射流速度对沙床冲刷的影响

射流冲刷在众多疏浚工程中应用广泛并发挥了重要作用,对其开展深入研究很有必要。基于Eulerian二相流模型和k-ε湍流模型,以粒径为0.04~0.23 mm的沙床为研究对象,进行了二维垂向淹没射流冲刷沙床的数值模拟,研究了粒径和射流速度对沙床冲刷的影响。结果表明,在研究的粒径范围内,最大冲刷深度和悬浮泥沙体积与流速成正相关,与粒径成负相关,且流速的影响更大。

Influence of particle size and jet velocity on sand bed scouring

Jet scouring has been widely used and played an important role in dredging engineering, so it is necessary to further study the jet scouring. Based on Eulerian model and k-ε turbulence model, the numerical simulation of scouring on sand bed with the particle size from 0.04mm to 0.23mm by 2D vertical submerged jet is conducted to study the influence of particle size and jet velocity on sand bed scouring. The result show that in the given range of particle size and velocity, the maximum scour depth and the volume of suspended sand are positively correlated to the jet velocity and negatively correlated to the particle size, and the influence of the jet velocity is greater.