机车用折角式过滤器特性的数值模拟

Numerical Simulation on Characteristics of Crankle Air Filter Used in Locomotive

研究了不同风速下通道宽度、折角角度及折角个数对机车用折角式过滤器阻力的影响,重点分析了高风速(≥5 m/s)下过滤器的性能.结果表明:高风速下,16 mm通道宽度过滤器的阻力增加迅速,对16 mm和20 mm通道宽度的过滤器而言,在6.5 m/s风速下,间距增加25%,阻力减少36%.折角角度的改变会显著影响过滤器的阻力,在高风速下这一特征更加明显.在相同通道宽度,通道长度减少29%的情况下,二折角过滤器的阻力较三折角过滤器平均减少40%.在高风速、低阻力使用条件约束下,可依据研究结果设计过滤器几何参数,将折角过滤器作为多级过滤的第一级.

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(≥5 m/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 6.5 m/s air flow velocity for 16 mm and 20 mm 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.