Aimed at evaluating air flow quality in engine inlet

a new evaluation method for ordered uniformity with direction of air flow based on air flow velocity distribution direction is proposed. Air flow velocity is projected to a prescribed direction

and then the divergence between the measurement velocity and the expected is calculated based on three traditional uniformity evaluation indices the evenness index γ

the Christiansen uniformity coefficient CU and the relative standard deviation CV. Ordered uniformity is evaluated before and after the improvement of engine inlet with the traditional uniformity evaluation indices and the new method. Experimental results show that the evaluation based on the new method is more obviously than the traditional indices. The engine external characteristic test shows that the fuel consumption rate is decreased after the inlet is improved and it is the same with the conclusion by the new evaluation method. So

the evaluation method for the ordered uniformity with direction of the air flow can effectively evaluate the air quality of the engine inlet.