Effect of guiding vanes in swirlers for use on diesel engines on the air flow

How the parameters of guiding vanes in swirlers for diesel engines affect the air flow between the vanes is studied. 2D flow field between the vanes is simulated by the CFD software. When the parameters of guiding vanes are different, mean velocity of air at the guiding vane outlet and the coefficient of loss of flow are calculated to evaluate the performance of guiding vanes. The results show that the mean horizontal velocity at outlet becomes higher when the outlet angle is smaller, the straight section of outlet becomes longer and the arc radius gets larger. While the loss coefficient of flow becomes smaller when the outlet angle is larger, the straight section length at the inlet and outlet are smaller, and the radius of arc is larger. The results of calculation agree basically with the experimental results of steady flow tests for the swirlers.