【摘要】 首先用三维涡方法模拟随时间发展的射流场,然后用Lagrange颗粒轨道模型模拟柱状粒子在圆射流场中的运动.通过对不同流场Re数、粒子St数、粒子长径比情况的计算,说明射流场具有很强的携带柱状粒子的能力.随着射流往下游发展,初始随机分布的粒子呈现出局部聚集的现象,并且逐渐出现最优取向.在小Re数流场和小长径比粒子的情况下,粒子位置分布更均匀,取向分布更随机.大St数的粒子位置分布更均匀,占优取向更明显.所得结果对工程应用有指导意义.更多还原

【Abstract】 The flow of timedeveloping jets was simulated numerically with the threedimensional vortex method, then the motion of suspended cylindrical particles in the jets was calculated with Lagrange model. The results with different Re number, particle St number and particle ratio aspect were obtained. The conclusions reached were that the particles keep in the jet region when they move in the jets, the particles with initial homogeneous distribution and random distribution of orientation will tend to inhomogeneous distribution and preferential orientation with the development of flow. The particles show more homogeneous distribution and more random distribution of orientation in the case of smaller Re number and smaller particle ratio aspect. For the case of larger St number, the particles distribute more homogeneously and have preferential orientations more obviously.更多还原