【摘要】 随着天然气田的开采，井口压力会逐渐降低.为满足引射器在变工况下也能够高效运行的工作需求，设计加工了一台中心环缝射流式引射器，并对喷嘴调节性能及变工况适应性进行了实验研究.结果表明：喷嘴位移量ΔL_x在设计范围内可以在工况不变时实现高压流体流量约30%的调节；当压缩比固定时，随着ΔL_x的增大，最佳膨胀比和引射率峰值均提高，且在大膨胀比下仍能维持70%以上的引射率，表明此技术可通过调节ΔL_x适应变膨胀比的工作需求；在膨胀比固定条件下，增大ΔL_x可以大幅提高最大引射率，但会减小稳定引射的压缩比范围.此外，根据实验数据拟合出设备ΔL_x与膨胀比和压缩比的关系式.更多还原

【Abstract】 As the gas field is developed, the wellhead pressure will gradually decrease. In order to meet the requirement of efficient operation of ejector under variable working conditions, a central annular jet ejector is designed and fabricated, and the nozzle adjustment performance and variable working condition adaptability are experimentally studied. The results are demonstrated that the high-pressure flow rate can be adjusted by approximately 30% through nozzle displacement ΔL_x within the design range under identical working conditions. When the compression ratio is fixed, both the optimum expansion ratio and peak ejector rate are observed to increase with elevated ΔL_x. Notably, the ejector rate is maintained above 70% under large expansion ratios, indicating that the technique can be adapted to variable expansion ratio requirements through ΔL_x adjustment. Under fixed expansion ratio conditions, the maximum ejector rate is significantly enhanced by increasing ΔL_x, whereas the compression ratio range of stable ejection is reduced. Additionally, the relationship between equipment ΔL_x and both expansion and compression ratios is established through experimental data fitting.更多还原