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为研究2叶片潜水搅拌机叶轮内部流动规律,利用Fluent 6.3大型计算流体力学软件,采用RNGk-ε湍流模型和SIMPLE算法,对2叶片潜水搅拌机搅拌的污水处理池进行数值模拟,分析了2叶片潜水搅拌机叶轮内部流场、压力和速度环量的分布情况.结果表明:叶轮内从叶片工作面到叶片背面流体速度梯度、压强梯度明显;叶片工作面附近流体流速低、压力高,在叶片背面有高速区和负压区;叶轮进出口轴面速度均呈抛物线分布,进出口速度环量变化较为平缓;叶片出口轴面速度均呈近似等轴面速度分布,进出口速度环量呈线性规律分布;叶轮内部流动稳定,这种流型设计可以较好地减少2次回流,叶轮可以高效运行.
In order to study the internal flow of 2-blade submersible mixer impeller, a 2-blade submersible mixer was simulated by Fluent 6.3 large-scale computational fluid dynamics software using RNGk-ε turbulence model and SIMPLE algorithm. The results show that the fluid velocity gradient and pressure gradient are obvious in the impeller from the blade working face to the back of the blade. The flow velocity and pressure of the fluid in the vicinity of the blade working face are high, Zone and negative pressure zone. The impeller inlet and outlet axial velocity all presented a parabola distribution, and the inlet and outlet velocities changed gently. The axial velocity at the outlet of the impeller was nearly equal to the equiaxed velocity distribution, and the inlet and outlet velocities were linearly distributed. Impeller internal flow stability, this flow pattern design can be better to reduce the 2 backflow, impeller can run efficiently.