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.