弯曲变截面隔离段参数化设计与优化

Parameterization and Optimization for Variable Cross-Sections Bend Isolator

关键词:  超燃冲压发动机  隔离段  几何融合  气动性能  激波串  参数优化

Key words:  Scramjet  Isolator  Shape blending  Aerodynamic performance  Shock train  Parameter optimization

摘要:

为了提高弯曲变截面隔离段的气动性能，发展了基于几何融合的参数化设计与优化方法。为了丰富几何融合方法产生构型的种类，提出了基于几何长度的新型离散化方法。为满足偏置要求及灵活性要求，中心线设计时选用了B样条曲线。利用优化软件Isight内置全局算法，针对某隔离段，以弯曲隔离段出口的总压恢复系数为目标进行了优化求解。结果表明：优化构型相对于原始构型，在给定相同来流入口情况下总压恢复系数提高了12.3%。

Abstract:

In order to improve aerodynamic performance of a specific variable cross-sections bend isolator, a parameterization and optimization method based on the shape blending function was developed. In order to increase the types of configuration generated by the shape blending function, a novel discretization memology based on geometric length was proposed. To meet the requirement of off-set and flexibility, B-spline curve was utilized for the off-set line design. Using the built-in global algorithm of the optimization software Isight, the total pressure recovery coefficient of the exit of a specific bend isolation section was targeted to optimize. It was found that the total pressure recovery coefficient of the optimized configuration was 12.3% higher than that of the original configuration given the same flow inlet condition.