Applying Numerical Simulation to Analyse the Performance of Nozzles

CFX is applied to study of the transonic multicomponent gas field in the adjustable convergent-divergent nozzles of the aero engine. The influences of different flight conditions on the three-dimensional transonic flow fields are analyzed numerically. The accuracy of the k-omega turbulence model is verified through the comparison between the numerical results and experiment data. And this turbulence model is used to predict transonic flows in general convergent-divergent nozzles. Calculations demonstrate that the average Ma number increases and average temperatures decrease gradually at the outlet of nozzle with the increase of flight altitude. It can be found that variation trend of the flow parameters is reasonable in the researched objects. Numerical simulation is a useful method to consider the effect of wall temperature distributions and to analyze the influence of the exhaust temperature on the infrared radiation. Numerical simulation is appropriate for the improvement and the design of aero engine.