Abstract: A model of Laval nozzle has been established by definite proportion according to oxygen nozzle used in actual production. With using commercial software Fluent 6. 2, k-£ model and coupling implicit expression solution, the a- daptability of different math models in nozzle was discussed, it was obtained the RNG k-£ model was better to simulate (he shock wave in nozzle. The distribution of flow field, Mach number and pressure in the Laval nozzle with different operating mode (P_o=0. 11 ~ 1. 0 MPa) were analyzed, and obtained that inhibited pressure at inlet of nozzle affected flow condition in Laval nozzle but it didn't affect the flow mode at outlet of nozzle which depended on geometry structure of nozzle.

Key words: Flow Field, Shock Wave, Oxygen Lance, Laval Nozzle, Numerical Simulation

摘要： 根据实际生产的氧枪喷头按比例建立了Laval喷管模型。应用商业软件Fluent6.2,采用κ-ε模型,耦合隐式求解器,讨论了喷管内不同数学模型的适应性,得出RNGκ-ε模型模拟喷管内激波较为理想。分析了Laval喷管内不同工况下(P₀=0.11～1.0 MPa)的流场、马赫数及压力的分布情况,得出喷管入口处滞止压力影响Laval喷管内部流动状况,但不影响出口流动工况,出口工况主要取决于喷管的几何结构。

关键词: 流场, 激波, 氧枪, Laval喷管, 数值模拟