锥形双路涡流管的内部流动与性能分析

锥形双回路涡流管的内部流动与性能分析Research on the Internal Flow and Performance of Conical Double-CircuitVortex TubeAbstractThe vortex tube is a relatively common energy separation device.Due to its simplestructure and stable operation,so it is economic and practical on some relative special field.But it has complex internal flow state and lacks systematic theoretical analysis now.So thevortex tube both has practical value and academic significance.In order to improve the energy separation performance of the vortex tube,a kind ofconical dual-circuit vortex tube device is puts forward.Its hot end is a conical tube,and ituses the additional loop intake of the hot end to push the cooling air in the vortex tube tobackflow.The methods of the research are numerical simulation and experiment.Throughcomparison and analysis of them,the influence of the minimum rectangular cross-section areaof the nozzle,the cone angel of the hot end tube,the diameter of the additional entrance andresistance are analyzed.In addition,these structural parameters of the vortex tube areoptimized design.Besides,the influence of the main inlet pressure,the additional inletpressure and the cool mass flow rate on the vortex tube is also discussed.Finally,theoperation parameters and the structure parameters are matched.Through the methods of numerical simulation and experiment,the influence trends andoptimal value matching of the performance parameters are obtained.The results show that therefrigeration efficiency of the conical dual-circuit vortex tube can achieve 23%.There is a certain difference between the numerical simulation and the experiment,because the internal turbulent flow in the vortex tube is complicated,and the numericalsimulation method for complex turbulent flow field is not very accurate,and it needs toperfect.Another reason is that when the experiments are operating,the operating parameterswill be changing,while they are constant values in simulation.Key Words:Conical double-circuit vortex tube;Additional loop;Separationperformance;Parameter optimizationII