基于响应面模型的高超声速低温喷管优化
Optimization of HYLTE nozzle based on response surface model
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摘要: 建立了高超声速低温(HYLTE)喷管的响应面模型，样本点设计矩阵采用正交试验设计法构造，样本数据通过3维粘性NS方程计算喷管光腔耦合段的多组分混合流场获得。基于HYLTE喷管响应面模型，对喷管进行了多目标优化，定义了综合性能参数，优化后喷管混合性能显著改善，综合性能明显提高。计算表明，基于响应面模型的优化策略，能够满足喷管优化对计算精度和计算量的要求。运用多学科设计优化软件框架iSIGHT作为建模和优化的辅助工具，提高了优化设计的实现效率。Abstract: The response surface model of Hypersonic Low Temperature(HYLTE) nozzle was built, and the design matrix of sample data points, used in this model, was derived by orthogonal design of experiment(DOE) procedure. The sample data were obtained by the nozzle and cavity flowfield calculation using computational fluid dynamics(CFD) method based on 3-dimensional viscous Navier-Stokes equation. Using the nozzle response surface model, multi-objective optimization of nozzle configuration was implemented. An integrated performance parameter was defined to evaluate the nozzle efficiently. Results indicate that the mixing of the optimized nozzle is enhanced remarkably and the integrated performance improves. So the optimization strategy based on response surface can satisfy the requirement for precisio
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