In order to increase particle separation efficiency of the centrifugal separator, a new blade is proposed and particle separation performance was examined by experiment and numerical simulation method. For the type A blade with inside cylinder and four blades, the 50% cut size decreases with the increase of inside cylinder diameter. The pressure drop of the type A blade increases as the inside diameter increases, especially diameter ratio greater than 0.8. The new blade of type B with inside cylinder, four blades and special rings on the inside cylinder shows higher particle separation efficiency and low pressure drop compared with the type A blade. The experimental partial separation efficiency qualitatively agreed with the numerical simulation results. (c) 2016 Elsevier B.V. All rights reserved.