Abstract: The influence of channel width， crankle angle and crankle number on the pressure drop of crankle air filter used in locomotive was studied. The characteristics of crankle air filter under higher flow velocity (≥5m/s) was analyzed emphatically. The results show that the pressure drop of filter with 16 mm channel width increases fast under higher air flow velocity. The pressure drop decreases 36% if the channel width increases 25% under 6.5m/s air flow velocity for 16mm and 20mm channel width filter. The change of crankle angle affects the pressure drops obviously under higher air flow velocity. The pressure drop decreases 40% when the crankle number decreases from 3 to 2， and the channel thickness decreases about 29%. Under conditions of high wind speed and low pressure drop， the geometrical parameters of the filter can be designed according to the research results， and the crankle filter can be used as the first stage of multi-stage filtration.

Key words: crankle air filter, numerical simulation, pressure drop characteristics, filtration efficiency, locomotive