Refrigerating Performance And Supercharge Study Of External-Circulation Dissipative Gas Wave Refrigerator

The External-Circulation Dissipative Gas Wave Refrigerator (ECDGWR) is a new generation gas wave refrigeration equipment. Its core component is wave rotor. A double-end-open pressure oscillating tubes is adopted, in which the low temperature gas is obtained by energy exchange using movement of shock wave and expansion wave. Heat transfer cycle is connected from external with equipment, achieving heat concentration recovery. It can be used abroad in condition of national gas refrigeration and copious cooling process.The study of External-Circulation Dissipative Gas Wave Refrigerator is developed based on imbursement of Chinese National Programs for High Technology Research and Development (863 program). The refrigerating performance and supercharge study of ECDGWR is done in four ways in this article, including the unsteady flow theory of aerodynamics, HYSYS chemical process simulation experiment, CFD numerical simulation experiment and physical experiment.(1)The wave movement and the flow field distribution are analyzed using one-dimensional theory of gas unsteady flow. Meanwhile, the article reveals energy exchange processes between inside tube and external, which are based on open system of first law of thermodynamics.(2)The reflow rate of refrigerator is calculated by HYSYS, which can simulate chemical process flow sheet. The relationship between pressure drop of reflow rate and reflux is analysed in detail. With the simulation experiments between isentropic efficiency and supercharge efficiency, proving that refrigerator's supercharge application is feasible. Meanwhile, the supercharge application is putted forward to two stage refrigerating system. In the two stage refrigerating cycle, cryogenic gas can pre-cool fresh incident gas in the first refrigerating cycle. The overall refrigeration cycle can obtain cooling capacity of higher grade, optimizing equipment performance.(3) Sets up a new 2-D whole machine numerical model with no pipe decreasing. Using CFD software simulate the running characteristics of the wave in the pipe. Primary research the reflected waves of the high temperature port and put forward optimization methods of the problem of inside flow field.(4) Establishes new experimental system, to study the wave matching and reverse flow problem in the pipe by experimental research. The performance of refrigerator improves by increasing the length of the nozzle wall and raising the pressure of high temperature port simultaneity.The study on refrigerating performance and supercharge of ECDGWR has been done by chemical process flow sheet simulation, numerical simulation and experiment. The results reveal that two stage refrigerating cycle is feasible. Under the current experimental condition, the isentropic efficiency has slightly improved with a maximum value of 61.2 percent.