【摘要】 本文采用欧拉–拉格朗日方法对静电平衡情况下的圆形截面90°弯管中的气固两相湍流流动进行了大涡模拟研究，重点研究了弯管中的饱和静电作用和Prandtl第二类二次流对于颗粒输送的影响。结果表明，模拟得到Reb=58k工况下的90°弯管中的载流相流场计算结果与实验结果吻合良好，弯管中平均二次流速度最大可以达到体积速度的55%，并且二次流对于离散颗粒相的输送影响显著。静电作用对于管道中心区域的颗粒影响较小，但对于近壁面区域的颗粒作用影响较大，加强了近壁面区域颗粒运动的湍泳现象。动力学分析结果表明，在远离壁面的大部分管道中心区域内流动对颗粒的拖曳力主导颗粒的运动。而对近壁面区域内的颗粒，静电力与拖曳力大小相当甚至超过拖曳力，静电力主导了近壁面区域内颗粒的运动。更多还原

【Abstract】 In this paper, the Euler-Lagrangian method is applied to study the gas-solid two-phase turbulent flow in a 90° bend with a circular cross-section under “electrostatic equilibrium” condition,the focus is effect of the Prandtl’s second secondary flow and electrostatics on particle transport. The results show that the simulation results of the carrier phase in a 90° bend at Reb= 58k are in good agreement with the experimental results. The mean secondary flow velocity in the bend can reach up to 55% of the bulk velocity, and the secondary flow has a significant effect on the transport of the discrete particle phase. The electrostatic effect has little effect on the particles in the central region of the pipeline, but has a nonnegligible effect on the particles in the near-wall region, which strengthens the turbophoresis phenomenon of the particles in the near-wall region. The dynamic analysis shows that, for the particles in central region of the pipe, the particle movement is dominated by the drag force of carrier phase. For the particles in the near-wall region, the electrostatic force is comparable to or even exceeds the drag force, and the electrostatic force dominates the movement of the particles in the near-wall region.更多还原