CAJ | 학술논문

提出了同时描述鼓泡塔宏观流动及气泡尾涡小尺度湍动的双尺度流体力学模型，其中大尺度剪切流通过经典k-ε模型描述，而小尺度尾涡湍动则由“尾涡温度”传输方程确定。通过在运动方程添加“尾涡压力”源项，构建大小双尺度流体运动的相互作用，解释鼓泡塔内含率非均匀分布的机制。模型将鼓泡塔内的能量耗散分解3种作用机制：大尺度剪切流引起湍动耗散；小尺度尾涡湍动耗散；尾涡与壁面作用的能量耗散，较好地解决了现有鼓泡塔模型能量不守恒问题。模型计算稳定性高，模拟结果与实验结果吻合良好。
제출료동시묘술고포탑굉관류동급기포미와소척도단동적쌍척도류체역학모형，기중대척도전절류통과경전k-ε모형묘술，이소척도미와단동칙유“미와온도”전수방정학정。통과재운동방정첨가“미와압력”원항，구건대소쌍척도류체운동적상호작용，해석고포탑내함솔비균균분포적궤제。모형장고포탑내적능량모산분해3충작용궤제：대척도전절류인기단동모산；소척도미와단동모산；미와여벽면작용적능량모산，교호지해결료현유고포탑모형능량불수항문제。모형계산은정성고，모의결과여실험결과문합량호。
A new two-scale hydrodynamic model was proposed to describe large-scale motion and small-scale bubble wake turbulence. The large-scale shear induced turbulence was resolved by classical k-εturbulence model, while the small-scale bubble wake turbulence was quantitively described by wake temperature transport equation. A wake pressure gradient source term was added to the motion equation to reflect the mutual influence between small scale turbulence and large scale fluid motion and to explain the mechanism of holdup non-uniform distribution in the bubble column. The model classified the energy dissipation into three kinds of mechanism:large-scale shear induced turbulence dissipation, small-scale wake turbulence dissipation, energy dissipation due to interaction between bubble wake and solid wall. The model well resolved the issue about energy balance. Simulation results agreed well with experiment data.