Study On The Influence Of Scroll Compressor Geometry On Flow Resistance And Heat Transfer

Scroll compressor structure is simple,stable operation,high compression performance,in various types of compressors occupy an important position,has a good market prospects and research value.At present,scroll compressors are widely used in aerospace,energy,military and vacuum technology,but the loss of flow resistance and compression chamber heat transfer of scroll compressors have a great impact on the performance of scroll compressors.In order to solve the flow resistance loss and the effect of compression chamber heat transfer on the performance of scroll compressors,it is necessary to further understand the working principle of scroll compressors,and study the mathematical relationship between scroll compressor geometry and flow resistance loss and compression chamber heat transfer.(1)In this paper,the research background and working principle of scroll compressor are first introduced,and the geometric size of the scroll compressor is studied,and a certain mathematical relationship between the basic geometric size of the scroll compressor and the height of the scroll tooth is studied under the conditions of suction pressure,stroke volume and pressure ratio.By calculating the geometric parameters of the vortex disk,a mathematical model between the radius of the base circle and the wall thickness of the vortex body and the height of the vortex teeth was established,and the results showed that the radius of the base circle of the vortex disk played a decisive factor in the shape of the vortex disk,so the radius of the base circle could be used as the final design variable.(2)The flow resistance loss in the scroll compressor is studied,and the flow resistance loss caused by the movement of the vortex disc in the scroll compressor,the flow resistance loss of the balance block,the flow resistance loss caused by the cross slip ring movement,the air flow friction loss,the sliding bearing friction loss,and the influence of air flow pulsation at the exhaust orifice on the power consumption are analyzed.The mathematical programming software is used to establish a mathematical model of the geometric size of the scroll disk base circle radius,the vortex disk wall thickness t and the flow resistance loss in the vortex compressor,the influence of the vortex disk base circle radius a and the vortex disk wall thickness t on the various flow resistance losses in the compressor are studied,and the geometric size of the scroll disk is determined to have the greatest impact on the flow resistance loss caused by the movement of the scroll disk.(3)The whole working process of a working chamber of a scroll compressor from the beginning of inspiration to the end of exhaust was studied,and the relationship between the geometry of the scroll compressor under the angle of any spindle and the heat exchange between the compression chamber and the wall surface of the scroll tooth was obtained.The heat exchange between the compression chamber and the vortex tooth wall is simulated by Fluent software,the temperature field distribution of the compression chamber and the heat exchange of the compression chamber through the boundary layer are obtained,and finally the theoretical calculation data and simulation data are compared and error analyzed.