Abstract
The toroid composite knockout is known as a new composite knockout, which has the compact composition, light weight, low power used and can be easily fixed. At the moment, the mean method to research the performance of the separation and operation is the experimental means. The research cycle and experimental funds will be decreased as well as the acquirement of the integrity cyclone interior flow regime information, if the theoretical analysis calculation and the numerical simulation of the flow field can be used to research the movement law of the fluid in the knockout and the effect of the composition size to the separation efficiency and the pressure drop.
Movement laws for fluid in toroid composite knockout were simulating analyzed by the FLUENT, according to the theory and method of CFD, basing on numerical simulation of flow field. And the internal movement laws was given. At the same time, by using the above method, the overall structure, the operational parameter of the toroid composite knockout and the composition size of the toroid have been optimized to enhanced the separation efficiency,  which is also succeed in the practical use.