| Gas wave ejector is a new type of boosting equipment. It realizes energy exchange between the different fluids by the transfer of pressure wave. Compared with static ejector, it has higher entropy efficiency. Especially in smaller pressure ratio, the advantage is more obvious. In gas drilling and distribution, the gas fields with different pressure should be done matched operation, which causes the waste of energy. The research on gas wave ejector has an important practical significance on low pressure gas field pressurization mining and recycling high pressure energy.In a view of the domestic and foreign, there are few reports about gas wave ejector. This paper begins with exploring the mechanism of energy transfer, and studies the performance of gas wave ejector through the theoretical analysis, numerical calculation and experiment. The results are as follows:(1) The wave motion in the wave rotor is analyzed using one-dimensional unsteady flow dynamic analysis method; and the ideal wave diagram is set up to analyze the working process.(2) The two-dimensional numerical model is established. Wave motion, interface operation, the flow speed and the pressure in the pressure equalization region can be obtained to analyze the internal flow characteristics. Based on the simulation, the comparison between the gas wave ejector and static ejector can be gained. In the small pressure ratio, gas wave ejector has higher entrainment ratio and isentropic efficiency.(3) The experiment process is designed, and the experiment system is established. The relationship of the structural parameters based on work wave diagram is analyzed. Based on the simulation result, the influence of Pm, speed, the port width, the solid wall and the deflection on the performance is revealed. Based on the results of the simulation and experiment, the determinate principle of the optimal value of each structural parameter is gained, that can provide an important basis for the parameter optimization.(4) The feedback structure is proposed. It can eliminate the compress wave when the medium port is opening, and can save the flow of the high pressure gas. The simulation and experiment are used to analyze the parameters. The best port width and deflection are obtained. The result is that, gas wave ejector with feedback structure has higher entrainment ratio and isentropic efficiency than that without. |
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