|Alternative Title||Study on Wave Propagation Characteristics of Rotary Gas Wave Refrigerator|
|Thesis Advisor||赵伟 研究员|
|Place of Conferral||北京|
Gas Wave Refrigerator (GWR) is a kind of equipment that can utilize the pressure energy of the gas to refrigerate the gas by driving the pressure oscillation tube. GWR is based on the theory of unsteady expansion waves. As GWR can make full use of the pressure itself, it is energy saving and environmental. In addition, GWR is the advantages of simple structure, low cost, easy operation and robust, and is a broad application prospect and market demand in industry. However, in practical application, the refrigeration efficiency still needs to be further improved, so the research on the gas wave refrigerator has an important application value. In this thesis, the effects of wall heat transfer, tube length, rotation frequencies, pressure ratios and other factors on the refrigeration performance of a GWR are studied numerically. Basing above, an optimized scheme of GWR’s core component - rotary distributor is proposed, and a new rotary GWR is designed and assembled. The experimental platform is set up to verify the numerical simulation. The relevant experimental result is compared with the numerical simulation, and is analyzed deeply. The main research achievements of this thesis are as follows:
(1) The wall heat transfer has great influence on the stable operation of oscillating tube and the efficiency of refrigerator. In this paper, the author compare the effect of the oscillation tube wall and 300K isothermal wall on operation condition of GWR. Combined with the temperature distribution characteristics of the oscillating tube, the design method of semi-adiabatic wall and semi-isothermal wall is proposed in this paper, which can maintain the stable operation of gas wave refrigerator and improve the refrigeration efficiency to some extent.
(2) The efficiency of gas wave refrigerator is obviously affected by tube wall heat transfer, tube length, rotation frequency and pressure ratio. In this paper, their effects on refrigeration performance are studied in detail by numerical method. For the first time, the characteristics of shock motion in an oscillating tube are given by using wave diagram. And the mechanism and rule of their effect on efficiency are analyzed with wave diagram, and the criterion of efficiency optimization is given.
(3). In this paper, combined with the efficiency optimization criteria of the numerical study, the structure of the rotary distributor is optimized, and an impeller device is installed inside the GWR. This paper has completed the design and experimental verification of a GWR, and carried out experimental research of different pressure ratios and rotating speeds. The motion law of wave system in the experiment is in good agreement with the calculated results. And in this paper, the wave diagram obtained by numerical simulation is used to explain the law of pressure change.
|杨丛笑. 旋转式气波制冷机波传播特性研究[D]. 北京. 中国科学院大学,2019.|
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