Integrated Performance Analysis And Experimental Study Of The Gas Wave Separator

The gas wave separator (GWS) is a new type of moisture gas condensing separation equipment, which compels the incoming stream to condense through the over-expanded gas wave refrigerator (OE-GWR), then separates and supercharges the mixture through the cyclone separation supercharger (CSS), so the whole system is an operation procedure including two units.Design and manufacture the first-generation device for the GWS, and a lot of numerical simulation and experimental study on both the refrigeration performance of the OE-GWR and the supercharge performance and separate performance of the CSS has been done in this paper. The main works are as follows:(1) Draw the theoretic wave pattern of the over-expanded gas wave refrigeration process by using the gas wave theory in the shock tube. An external power source is needed to achieve the over-expanded gas wave refrigeration cycle.(2) A numerical simulation of the whole OE-GWR in2-D has been done by using the CFD software FLUENT and Gambit. The distribution of the internal flow field of the device has been analysised in detail, and both the rule of the gas wave and the motion rule of the contact face in the rotor has been analysised in detail. The feasibility of the theoretic wave pattern has been proved by the comparison between the theoretic wave pattern and the result of the numerical simulation.The effect of the pressure rise change caused by the CSS on both the distribution of the wave pattern in the wave rotor and the refrigeration efficiency has been investigated by using the numerical sumlation of the whole OE-GWR. The results show that:there is an optimal matching relation among the total pressure ratio, the equipment structure parameters, rotate speed and the pressure rise caused by the CSS, and the refrigeration efficiency would reach the highest value while the optimal relation was matched.(3) The experimental process for the gas wave separator (pure refrigeration process) system was designed and built. The effect of the setover degree between the inlet and outlet nozzles, the rotate speed, the total ratio and the solid wall width of the high pressure inlet nozzle on the refrigeration efficiency has been investigated experimentally. The results show that:there is an optimal matching relation among those factors, and the refrigeration efficiency, the compression efficiency and the macro total effifiency would reach the highest value while the optimal relation was matched.(4) A numerical simulation of the whole CSS in3-D has been done, and the pressure distribution, velocity distribution and the turbulent dynamic characteristics in the internal part of the device have been analysised in detail, which proved the rationality and feasibility of the CSS pre-design. The effect of the outer diameter change of the cyclone impeller on the distribution of the whole inner flow field has been investigated by using the numerical simulation of the whole device, and the results show that:the combination property of the whole CSS would be improved if the outer diameter of the cyclone impeller was chosen appropriately.(5) The experimental process for the single CSS operating experimental system was designed and built. The reseach work are as follows:The supercharge performance of the CSS fan without the cyclone impeller has been investigated, and the characteristic curve of the single fan has been drawn; The effect of the rotate speed and the open proportion of the valve at the outlet on the combination property of the single supercharger section has been investigated experimentally; The effect of the cyclone impeller on the supercharge performance of the single supercharger section has been investigated experimentally; The effect of rotate speed on the separate performance of the CSS has been investigated. All of the results show that:the CSS can achieve the expected functions of both supercharging and separating.