The Numerical Simulation on Pressure Field of Decanter Centrifuge at Various Revolving Speeds

The separation effect of centrifuge is influenced by its revolving speed. The higher revolving speed it gains, the faster solid particles sediment it can realize, which means the better separation effect will be achieved. The paper is finished upon the basis of high-speed decanter centrifuge LW355-1235. Taking the speed discrepancy of 25r/min between spiral and drum into consideration, we use Fluent, the fluid computation software, to obtain the distribution of pressure field by simulating the internal flow field with the use of RNGk- turbulence model under different circumstances. The result shows that under the circumstance of a certain speed discrepancy, The difference between simulated hydraulic pressure and theoretical pressure is getting bigger with the increase of revolving speed and decrease of hysteresis of liquid layer. Besides, static pressure increases in accordance with the revolving speed, but it decreases at the overflow. Dynamic pressure increases along the radial direction with its peak at depiler hole, and it decreases at dregs discharge exit and overflow. This paper is designed to provide a reference for the structural design and theoretical research for decanter centrifuge.