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蒸汽喷射器广泛应用于过程工业,但对其理论研究并不完善。本文建立了蒸汽喷射器的二维计算机流体力学模型,研究了主动流体和引射流体在混合段相互作用的流场特征,并对流场内激波的产生、发展和结束进行了分析。在此基础上,对不同混合段喉管直径和混合段长度的喷射器性能进行了模拟,并给出了设计工况的最优值。通过对最优性能下激波特征的分析显示,钻石激波在混合段出口附近结束是喷射器获得最佳性能的必要条件。本文结论可以为蒸汽喷射器的优化设计提供技术依据。
Steam ejectors are widely used in the process industry, but their theoretical research is not perfect. In this paper, a two-dimensional computer fluid dynamics model of a steam injector is established. The flow field characteristics of the active fluid interacting with the injection fluid are studied. The generation, development and termination of the shock wave in the flow field are also analyzed. Based on this, the performance of ejector with different mixing section diameter and mixing section length was simulated and the optimal design conditions were given. Analysis of the shock characteristics under optimal performance shows that the completion of the diamond shock near the exit of the mixing section is a necessary condition for achieving the best performance of the injector. The conclusion of this paper can provide the technical basis for the optimization design of steam injector.