Numerical Simulation Research on the Effect of the Rotor Passage Cross-Sectional Dimension on the Performance of Gas Wave Ejector

Abstract

The gas wave ejector (GWE) that utilizes pressure waves to realize the efficient energy transfer between gases has broad application prospects in chemical industry. In this study, the numerical simulation method was used to investigate the influence mechanism and law of the rotor passage height (h), width (w) and aspect ratio (h/w) on the equipment performance. The main conclusions are as follows: Increasing the passage height or width alone within a certain range may help improve the equipment performance, but if the passage width is too large, the sealing time of passage may be too short and the gas expansion may be incomplete, resulting in a significant reduction in performance. When the passage aspect ratio is fixed, the effects of passage width and height on the equipment performance are independent of one another, and the performance is determined by the superposition effect of these two. Within the range of passage cross-sectional area (40mm2~360mm2) investigated in this study, the passage aspect ratio for achieving the best performance is in the range of 0.71~1.6, and the efficiency and ejection rate under the same h/w increase with the increment of the cross-sectional area when h/w≥0.71.