| In order to meet the increasingly stringent emission regulations of diesel engines,this paper deeply studies the mechanism and influencing factors of oil and gas separation under the combination of orifice plate and baffle,coarse filtration and fine filtration of 6.494L six-cylinder diesel engine labyrinth oil separator.The gas phase and discrete phase two-phase flow simulation results of the helium gas volume of 150 L/min show that the oil droplets hit the wall surface and the velocity is sharply reduced.The collision process adsorbed on the wall surface is an important mechanism for oil and gas separation.The larger the gas volume,the higher the separation efficiency high.The enthalpy gas is increased in speed through each filter hole,reaches a maximum at the fine filter hole,and the temperature field gradually decreases but the amplitude is small.The original separator pressure has the problem of excessive loss and low separation efficiency,To study the effect of different structural parameters on separation performance,another five separators were redesigned.When the diameter of the coarse filter plate 1 is changed from 5 mm to 4 mm,the separation efficiency is lowered by 1.46%,The change in diameter has a weak influence on the separation efficiency,When the number of holes is reduced from 35to 29,the separation efficiency is increased by 10.07%,which significantly improves the separation efficiency.At this time,the influence of the gas flow rate is smaller than the influence of the vortex on the oil droplet trajectory.The crude was filtered and the baffle plate 2 when the pitch becomes 5mm 2mm,large particles too late to change the direction of movement of the oil droplets impinge the wall surface,it improves the separation efficiency of 3.86%.The number of fine filter holes has the greatest influence on the separation efficiency,which mainly achieves the separation of fine oil droplets.The gas flow velocity is large and is not conducive to oil droplet separation.When the number of fine filter pores is reduced from 13 to 9,the separation efficiency is improved by 16%.In the research range,the distance between the coarse filter plate and the baffle and the number of fine filter holes increased,the flow area increased,and the pressure loss decreased significantly.When the diameter of the fine filter hole was larger than 3 mm,the pressure drop was not obvious.Due to the contradiction between separation efficiency and pressure loss,in order to further improve the separation efficiency and obtain lower pressure loss,Structural optimization of the separator.using the optimal Latin hypercube DOE design method,experiments of L orifice plate and baffle spacing,hole number N,and fine filtration precision filtration pore diameter factor R these three variables within the scope of the constraint random sampling point.post-processing image correlation analysis in L,N,R negative effects on the pressure loss,the correlation is abate,in turn,L and N negative effects on separation efficiency,R generate positive effect,the correlation of N is greater than the R,L negative effect is very weak.Based on the optimization analysis,three structural parameters,namely,increasing the spacing L between the orifice plate and baffle appropriately,number N of fine filter holes,and diameter R of fine filter holes,were obtained.Compared with the original model,the separation efficiency of the optimized separator increased by 9.69%,and the pressure loss decreased by 1663Pa,significantly improving the separation performance.In this paper,the influence of structural parameters on separation performance and optimization of structural combination are studied by numerical simulation method,which further improves separation efficiency and obtains lower pressure loss,This research method has certain guiding significance for the performance improvement of separator. |
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