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结合BWRS真实气体状态方程、移轴Witoszynski公式、圆弧加直线及特征线法设计喷管型面,利用Fluent软件模拟喷管内气体的流动过程,并分析入口参数及出口背压对喷管制冷效果及气体液化过程的影响。研究表明:喷管的制冷作用可满足天然气中酸性气体的液化条件;提高入口压力或降低入口温度均可提高喷管的制冷效果,促进气体的液化过程;出口背压的提高会导致激波进入喷管,破坏液化环境,因此应合理选择背压以保证喷管的制冷性能。
Combining the real gas equation of BWRS, Witoszynski formula of shift axis, arc plus straight line and characteristic line method to design the nozzle profile, the flow of gas in the nozzle was simulated by Fluent software, and the effect of inlet parameters and outlet back pressure on nozzle cooling effect And the impact of gas liquefaction process. The results show that the cooling effect of the nozzle can satisfy the liquefaction conditions of acid gas in natural gas. Increasing the inlet pressure or decreasing the inlet temperature can improve the cooling effect of the nozzle and promote the liquefaction process. The increase of the outlet back pressure leads to the shock wave entering Nozzle, the destruction of liquefied environment, it should be a reasonable choice of back pressure to ensure the nozzle cooling performance.