折流式旋转床气相流动的CFD模拟

CFD Simulation of Gas Phase Flow Field in a Rotating Zigzag Bed

采用计算流体力学(CFD)方法对折流式旋转床气相流场和压力分布进行了模拟,研究了折流式旋转床转速、进气量对转子外侧和内侧气相流场的影响,并用实验数据对模型进行了验证.结果表明,模拟结果与实验数据相对误差在9%以内;气体由转子外侧进入转子内时,流速明显改变,切向速度占总速度的76.1%~99.9%,轴向速度和径向速度均较小.随气体流量和转速增大,切向速度明显增大.气体流出转子内侧时,动圈附近存在一个最低压力和一个最高压力,产生了逆时针旋转和顺时针旋转2个漩涡.两漩涡交界处气体流动较剧烈,靠近转轴处气体存在回流,但速度较小.

The gas phase flow field and gas pressure in a rotating zigzag bed were simulated with computational fluid dynamics（CFD）. The effects of rotational speed and gas flow rate on the inner and outer of the rotor velocity distribution and gas pressure was studied and analyzed. The model was validated by experimental results. The results show that the averaged relative error between experiments and calculation is less than 9%. Gases from outside into the rotor, the rotor speed obvious changes have taken place. Tangential velocity of total speed by 76.1%~76.1%, axial velocity and radial velocity is very small. As the gas flow rate and rotating speed increases, the tangential velocity increase obviously. Gas flow inside of the rotor, there is a low pressure value and a high pressure value in the near rotation baffle, there is a large and a small vortex, a counterclockwise, a clockwise. In their border, gas flow more severe and the gas outlet close to the shaft, also gas existing reflux, but speed is smaller.