Abstract: The fluent program is used to simulate three-dimens- ional steady flow in cyclone separator of high-pressured natural gas. Flow field value inside of cyclone separator in different pressure is compared. The results show that the pressure has little influence on axial velocity and radial velocity of cyclone separator, but more influence on tangential velocity. The cyclone separator's pressure drop is increasing with the rising of the pressure, nearly liner relationship. Under the highpressure conditions, the influence of vent pipe diameter and the inlet pipe of cyclone separator flow field value is regular.

Key words: Collection efficiency, Cyclone separator, Numerical simulation