The Numerical Simulation And Performance Analysis Of Labyrinth Screw Pump

A labyrinth screw pump is a new little-flux and high-lift pump. It can be applied in many production and living fields, ranging from petrochemical processing, agriculture, food, and medicament, etc. The structure and principle of this pump are simple. The stator and rotor with multi-threads screw of opposed spiral hand are the primary work parts. And there is a tiny clearance between them, which is clearance fit. When the rotor is high-speed rotating as the pump shaft, the fluid in flow channel forms the pump-up-flow under the influence of the shear and viscous force. The pump would be in normal working condition when the pump-up-flow is larger than differential-pressure-flow formed from the pressure difference between inlet and outlet.A numerical simulation with Fluent about CFD is used on the labyrinth screw pump in my paper. The paper divides mainly into three parts. The first step is to structure the geometrical and physical models. And the geometrical model is formed mainly in Gambit, which is the fore processing software of Fluent. The research of single model is the second step. Choose the typical work condition of the pump, study the distribution of the velocity, pressure and turbulent intensity in flow field, calculate performance parameteres, and scale performance characteristics. The final step is the research of multiform model. The method is to study the alterative trend of performance characteristics when the geometric parameters change. Geometric parameters mainly include the clearance between rotor and stator, the spirochetal length, the threads number of the stator, etc. Furthermore, different screw serrate pumps are also studied.In conclusion: the screw rotor velocity becomes larger and the pressure is lower. So we can conclude that the screw rotor plays a more important role while the pump is working. The intensity of turbulence is largest in clearance. The influence of volumetric and mechanical losses will be considered in the process of post processing because they can not be simulated by Fluent. The pump will be in best working order when c≤03mm and l = 160～220mm. The threads number has obvious influence to the pump. The lift of the pump with triangular serrate is highest, and the efficiency of the pump with semicircular serrate is largest.