Development And Research On The Performance Of The Vortex Of Supercharger

The vortex compressor is a kind of gas booster with small flow and high lift.Due to its unique supercharging principle,it can be used for both blowing and suction.Under certain conditions,it can replace the compressor and has a very broad application prospect.In this paper,the single-stage vortex booster structure in a certain type of two-stage vortex compressor is modeled and meshed.The numerical calculation of the structure is performed using CFD software and the results are analyzed.The following results are obtained:1.The flow channel and the simplified gap are separately meshed and assembled in pre-processing software in the form of interfaces.This method greatly simplifies the establishment of models with extremely thin features.Through the numerical calculation of the model established by this way of thinking,a performance curve similar to the experimental result is obtained,the existence of longitudinal vortices is verified,and the further flow field analysis verifies the principle of supercharging and illustrates the rationality of this modelling idea.2.With the increase of the number of impeller blades,the pressure rise and efficiency of the equipment are increasing,but the growth rate is getting smaller and smaller.Through the analysis of the internal flow field of swirl vortex structures with different number of leaves,this result is due to the fact that when the number of leaves is small,the increase in the number of leaves will lead to an increase in the number of pressurization times during the spiral movement of the gas;when the number of leaves reaches a certain number The number of pressurization tends to be stable,resulting in a decrease in the increase in pressure rise to no longer change.3.With the increase of wheel-diameter ratio,the pressure rise and efficiency of the equipment are increasing and then decreasing,which indicates that the wheel diameter ratio of the vortex structure has a reasonable range.The optimal wheel diameter ratio of the vortex structure studied in this paper is between 0.73 and 0.76.4.With the increase of the blade width,the pressure rise of the equipment shows a trend of first increase and then change,and the efficiency of the equipment increases first and then decreases.This is because as the width of the blade increases,part of the vortex generated by the blade agitation does not participate in the momentum exchange of the gas in the longitudinal vortex,so that the pressure does not increase further and the efficiency decreases.5.The chamfer of the annular flow passage section influences the formation and quality of the longitudinal vortex,and ultimately affects the pressure rise of the equipment.The vortex structure with a certain body size has an optimal chamfer range under a fixed blade structure.The optimal range of the vortex structure studied here is 18 to 20 degrees near the blade tip and 12 to 15 degrees near the blade root.6.The reduction of the angle of the tongue can increase the pressure rise of the device,but the smaller angle of the tongue will expand the area with higher temperature at the tongue and affect the service life of the device.7.The pressure rise curve of the single-stage vortex structure of this size is obtained at different rotation speeds,which provides a reference for the selection of the rotation speed in engineering applications.Through the orthogonal test method and range analysis method,three structural parameters were selected as the optimization index,and the structural configuration scheme of the maximum efficiency and maximum pressure rise of the single-stage vortex structure was obtained.