Abstract
The effect of mineral dust in the air sucked in by an engine on accelerated component wear and reduction in performance was presented. The necessity to use two-stage air filters (multicyclone-paper insert) for military vehicles was shown. The results showed that placing an air filter in the path of the air entering the engine causes an additional pressure drop (air filter resistance increase), which leads to engine power decrease and increased fuel consumption. An analysis of model filter beds’ pressure drop changes (depending on bed parameters, aerosol flow parameters, and dust content) was carried out. It was revealed that it is very difficult to model changes in pressure drop in filter beds for actual conditions that appear during vehicle operation. The air filter pressure drop measurement results of more than 20 tracked vehicles operating in variable air dust concentration conditions were presented. The forms of selected regression models of the “life curve” type, best suited to the actual changes in air filters pressure drop as a function of the vehicle mileage, were determined. Significant differences were found between the same model values for different units of the tested vehicles. The quality of forecasting pressure drop value by selected functions was assessed by extrapolating them to the value of the next measurement and comparing the forecast and actual value. It was found that for the performed experiment, sufficiently good results of experimental data approximation and forecasting were obtained for a simple linear model.
Highlights
Military motor vehicles and working machines are mainly operated off-road, in sandy and desert terrain, where mineral dust concentration in the air is high and often exceeds 1 g/m3
The findings showed that lower pressure drop was obtained at the sine wave-shaped pleated air filter
All monotonic functions with parameters obtained by the use of least squares method as pressure drop regression models for vehicle filters resulted in large correlation coefficient values between the modelled and model values
Summary
Military motor vehicles and working machines are mainly operated off-road, in sandy and desert terrain, where mineral dust concentration in the air is high and often exceeds 1 g/m3. The intensity of filter pressure drop increase depends on the conditions in which the vehicle is operated, mainly on dust concentration in air and vehicle (engine) operating time. The intens4itoyf 2o6f filter pressure drop increase depends on the conditions in which the vehicle is operated, mainly on dust concentration in air and vehicle (engine) operating time. The quantity, height, and pleats width are the main filter cartridge dimensions that describe the pleating geometry and determine filtration paper surface area They have a significant influence on the flow field, both in respect of the air and dust particles, through and near the pleated surface of the filter material, which in turn affects the separation efficiency and pressure drop. PPrreessssuurree ddrroopp mmeeaassuurreemmeennttss wweerree mmaaddee wwiitthh tthhee uussee ooff aann iinnssttrruummeenntt,, tthhee bbaassiicc ccoommppoonneenntt ooff wwhhiicchhisisaavavcaucuumumgaguaguegwe iwthitahmaemaseuarsinugrinragnrgaenogfe0o–2f 00–k2P0a kanPda aanndinadniicnadtiiocnataiocncuarcaccuyraocfy0.o1f k0P.1a.kPa
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