The Vortex Tube's Experiment Of Cooling Capability And Energy Separation Mechanism

The Ranque effect (the Ranque-Hislsch effect or the vortex effect) is a very strange phenomenon in the gas dynamics of vortex flows,and the vortex tube embodies this effect. In the vortex tube, the inlet gas is divided into two outlet flows, one is the peripheral gas, which has a higher temperature than the initial gas,while the other is the central flow, which has a low temperature, so the two different temperature flows can be obtained.Vortex tube consists of nozzle, vortex chamber, separating cold plate, hot valve, hot and cold end. It has a very simple structure and is operated easily and without any moving part and has a wide-ranging temperature changes and is maintained easily. So the vortex tube is a very interesting device, more and more people are devoting themselves into the research. And the vortex tube has been used in many field. The main aim of this thesis is to study the performance of a vortex tube in room temperature ranges by experiment and theory . The mechanism of the energy separation of the vortex tube is researched by measuring the temperature field of vortex tube hot end, and a new viewpoint about the energy separation of vortex tube is set up by principle of conservation of negative quantity.In the experiment, the test-bed is designed and built, including experiment sets and measuring system.In the experiment, the constringent atmosphere of Pi=0.7MPa is used for the medium. The infection of three kinds of different nozzle structure and four different channel numbers of nozzle on the temperature field of vortex tube hot end and the capability of vortex tube are researched, and the change of the capability of vortex tube along with cold mass flow rate ratio is analyzed. The results show that: vortex tube's axis has the lowest temperature, the temperature form centre to circumference get higher with radius increasing; and the temperature also get higher along the direction of axis. There is an interface between at cold and hot airflow which is at 0.7R where energy changing is taking place. The cooling effect gradually increases with the increase of the cold air fraction at an initial stage, reaching the maximum value corresponding to different cold air fractions, and then decreases gradually; so there is a best cooling effect. The heating effect gradually increases with the increase of the cold air fraction, and it's anticipated that the heating effect will get max when the cold air fraction is approaching to 1. The COP also increases with the increase of the cold air fraction under 60% cold air fraction.