Research on the Effect of Pressure Port Design onthe Performance of Radial Gas Wave Ejectors

Introduction: Gas wave ejectors have broad application prospects in natural gas extraction and transportation. The axial gas-wave ejector performs poorly at high compression ratios. Therefore, the centrifugal effect of the rotating radial oscillator tube can be utilized to improve the ejector performance. This paper has maximized the performance of the radial gas-wave ejector through a well-designed pressure port. Methods: Computational Fluid Dynamics (CFD) commercial software FLUENT was used for numerical simulation in this study, and a three-dimensional numerical model was employed to improve computational accuracy. This paper combines numerical simulation and experimental analysis to study the influence mechanism of pressure port position on the ejector performance of the radial oscillator tube. Results and Conclusion: When the port position is deviated, the optimal functional wave system is disrupted, leading to a return flow from the medium-pressure port or insufficient gas intake at the low-pressure port, which in turn reduces ejector performance. The delayed opening of the medium-pressure port, early closure of the high-pressure port, and early closure of the medium-- pressure port have a particularly significant effect on device performance, leading to strong reflected compression waves within the wave rotor and a large amount of backflow when the flow path is connected to the low-pressure port. A deviation of 10° from the medium-pressure port in the experimental range results in a decrease of more than 60% in the ejector rate and the overall device efficiency. Under the comprehensive experimental design conditions, the highest ejector and isentropic efficiencies of the device can be achieved when αHM=12°, αHP=20°, αHL=7°, αMP=23°, αLP=14°, which are 29.75% and 53.26%