Research On Airflow Pulsation Reduction Of Cross-flow Perforated Pipe Based On Buffer Tank

Reciprocating compressor is a general gas pressure device,which is widely used in petroleum,chemical and metallurgical industries.Periodic intermittent suction and exhaust of reciprocating compressor will produce certain air pulsation,which will cause pipeline vibration and seriously affect personal safety and property safety.In recent years,domestic and foreign research on airflow fluctuation in compressor is mostly based on plane wave theory and one-dimensional unsteady theory,and the calculation results and accuracy are often poor.Based on this,this paper mainly uses CFD method based on finite volume theory to carry out joint modeling and simulation,which has relatively high calculation accuracy and saves manpower and material resources.The main research results are as follows:(1)The CFD method is used to simulate and analyze the three models of straight pipe layout at the inlet and outlet of buffer tank,the ratio of length to diameter of buffer tank and the extension of straight pipe,and the results are compared with the experimental data.The conclusion is that the optimal pipeline layout is that the straight pipe at the inlet and outlet is connected with the bottom circle at both ends of the cylinder.At this time,the pressure non-uniformity is the smallest and the pressure non-uniformity is reduced by 22%.The optimum length-to-diameter ratio model of buffer tank is 2:1,and the pressure inhomogeneity is reduced by 0.13%.(2)The influence of the structure size of perforated tube on pressure loss is studied by numerical simulation and experiment,and the correctness of numerical simulation is verified.At the same time,it is deduced that perforated tube of perforated plate can improve the effect of reducing air pulsation.It is concluded that pressure loss decreases gradually with the increase of through-hole ratio.When through-hole ratio increases from20% to 25%,pressure loss phase occurs.With the increase of diameter from 2 mm to 12 mm,the pressure loss increases by 9%.With the increase of diameter,the pressure loss decreases gradually.With the increase of diameter from 30 mm to 40 mm,the pressure loss decreases by 47.59%.However,when the diameter is more than 40 mm,the pressure loss decreases by less than 8.5 kPa.(3)According to the structural size study of the cross-flow perforated tube based on the buffer tank,the results show that the change of the pore size has little effect on the pressure non-uniformity change,and the relative decrease of the pressure unevenness is within 1.7%.The change of the through-hole rate is not for the pressure.The effect of uniformity change is remarkable.When the pressure non-uniformity increases from 25% to50%,the maximum can reach 37%.With the increase of the pipe diameter,the pressure unevenness will gradually decrease,when the pipe diameter is smaller than When the100 mm is gradually increased,the pressure unevenness is relatively reduced by up to 52%,and when the pipe diameter is larger than 100 mm,the pressure unevenness is maintained within 8%.