超音速分离线摆动喷管型面的代理优化方法OA

To address the aerodynamic shape optimization of supersonic split line(SSSL)nozzle under multiple operation conditions,an efficient surrogate-assisted Bayesian optimization method was established in combination with three-dimensional numerical simulations,and the optimal solution was obtained.The variance-based Sobol sensitivity analysis method was employed to quantify the sensitivity of characteristic variables.The results demonstrate that the performance of the optimized SSSL nozzle is improved by 15.6%,indicating significant overall optimization benefits and validating the effectiveness of the optimization design method for the SSSL nozzle under multiple operating conditions.Partial dependence plot analysis indicates that the initial expansion-section half-angle α,the outlet expansion half-angle β and the downstream arc radius R exhibit weak overall effects on the response.The distance from the swing center to the throat diameter Lr dominates the response,whereas the interaction between the half-angle of the initial expansion section(α)and the expansion ratio at the split line(ε2)is strong.