Abstract
The structural optimization design of the secondary shock wave channel in a convergent-divergent nozzle is carried out with the latin hypercube design method and response surface methodology. The multi-island genetic algorithm is used to find the optimal solution with four designed parameters including the wedge wall angle of secondary flow chamber δ1, the inclined wall deflection angle of secondary flow chamber γ, the width of front vacuum chamber w1 and the distance from the secondary flow chamber to nozzle outlet e. The numerical results indicate that the direct secondary shock wave channel can increase the efficiency of the secondary flow and improve the nozzle performance. The influence on the thrust pitching angle δp is w1, e, γ, and δ1 following in order of decreasing influence.
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