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A multiobjective shape optimization study for a subsonic submerged inlet.

机译：亚音速水下进水口的多目标形状优化研究。

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摘要

The purpose of the present work is to summarize the findings of a multiobjective shape optimization study conducted for a subsonic submerged air vehicle inlet. The objective functions of the optimization problem are distortion and swirl indices defined by the distribution of flow parameters over the exit cross-section of the inlet. The geometry alteration is performed by placing a protrusion in the shape of a fin on the baseline inlet surface. Thus, the design variables of the optimization problem are chosen to be the geometrical parameters defining the fin protrusion; namely fin height, length and incidence angle. The Trade Off (also known as epsilon-constraint) method is employed for finding the Pareto optimal set formed by the nondominated solutions of the feasible design space. Since the flow domain solution is required for every step along the line search, an automated optimization loop is constructed by integrating the optimizer with a surface modeler, a mesh generator and a flow solver through which the flow parameters over the compressor face are computed. In addition, the trade study for fin protrusion, the analyses and the comparison of the baseline and Pareto optimal solutions are presented and observations concerning grid resolution and convergence behaviour are discussed. The results display an irregular and discontinuous Pareto optimal set. Optimum inlet designs are scattered in two regions from which one representative inlet design is chosen and analyzed. As a result, it is concluded that an inlet designer has two options within the framework of this optimization study: an inlet design with high swirl but low distortion or an inlet design with low swirl but higher distortion.
机译：本工作的目的是总结针对亚音速水下飞行器进气口进行的多目标形状优化研究的结果。优化问题的目标函数是变形和涡流指数，该指数由入口出口横截面上的流量参数分布确定。几何形状的更改是通过在基准进气口表面上放置鳍状突起来实现的。因此，选择最优化问题的设计变量作为定义鳍片突出的几何参数。即鳍的高度，长度和入射角。权衡（也称为ε约束）方法用于找到由可行设计空间的非支配解形成的帕累托最优集。由于沿线搜索的每个步骤都需要流域解决方案，因此，通过将优化器与表面建模器，网格生成器和流求解器集成在一起，可以构建一个自动优化循环，从而可以计算出压缩机面上的流参数。此外，还对翅片突出进行了贸易研究，对基线和帕累托最优解进行了分析和比较，并讨论了有关网格分辨率和收敛行为的观察结果。结果显示不规则且不连续的帕累托最优集。最佳的进样口设计分散在两个区域，从中选择并分析一种代表性的进样口设计。因此，可以得出结论，在优化研究的框架内，进气口设计人员有两个选择：具有高涡旋但低失真的进气口设计或具有低涡旋但具有较高失真的进气口设计。

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  • 作者

    Taskinoglu, Ezgi S.;

  • 作者单位

    Rutgers The State University of New Jersey - New Brunswick.;

  • 授予单位 Rutgers The State University of New Jersey - New Brunswick.;
  • 学科 Engineering Aerospace.; Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 106 p.
  • 总页数 106
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 航空、航天技术的研究与探索;机械、仪表工业;
  • 关键词

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