Parameterization and optimization for shape-transition curved isolator
Parameterization and optimization for shape-transition curved isolator
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形状过渡曲线隔振器的参数化与优化
DOI：
10.1016/j.actaastro.2018.06.050
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发表时间：
2018-10
影响因子：
3.5
通讯作者：
Xiong Bing
中科院分区：
文献类型：
--
作者：
Meng Zewei;Fan Xiaoqiang;Wang Yi;Xiong Bing
为了优化某型变截面弯曲隔离段的总压恢复性能，采用数学方法对其进行了设计和参数化。混合函数用于从入口到出口的截面变形，B样条曲线用于控制截面平移以满足偏移要求。基于无背压条件下的数值计算结果，引入进化算法（多岛遗传算法），以总压恢复系数为目标搜索最优个体。首先，通过与风洞实验结果的对比，验证了计算方法的准确性和可行性。然后，选择了三种典型的弯曲隔振器进行研究，包括矩形转圆形隔振器、圆形隔振器和矩形隔振器。最后，分析了无背压和变背压两种情况下的优化构型性能。结果表明，优化后的隔振器在两种状态下都具有良好的性能。在无背压状态下，当优化偏置线使总压损失最小时，额外总压损失主要由结构的润湿面积决定。在反压状态下，弯曲隔振器也观察到了由反压条件变化引起的分离模式切换。通过对激波串前缘位置的分析，发现优化后的矩形转圆形隔离段的抗反压能力最好。该优化方法也可应用于其它变截面弯曲隔振器的研究。
In order to optimize total pressure recovery performance of a type of variable cross-section curved isolator, it is designed and parameterized by mathematical methods. Blending functions are utilized to morph cross-sections from entrance to exit and B-spline curves are used to control cross-section translation to meet offset requirement. Evolutionary algorithm (multi-island genetic algorithm) is introduced to search the optimum individual for the target of total pressure recovery coefficient based on numerical calculation results under no backpressure conditions. Firstly, to ensure accuracy and feasibility of the calculation method, it is validated by comparing with the wind tunnel experiment results. Then, the three typical curved isolators, including rectangular-to-circular isolator, circular isolator and rectangular isolator, are chosen to study. Finally, the optimized configuration performances are analyzed under both no backpressure and variable backpressure conditions. The result shows that the performances of optimal isolators are well in both states. In the no backpressure state, the extra total pressure loss is mainly determined by wetted area of the configuration when the offset line is optimized to minimize the total pressure loss. In the backpressure state, the separation mode switch induced by the changes of the backpressure condition is also observed in curved isolators. What's more, the withstanding backpressure ability of the optimized rectangular-to-circular isolator is best based on analyzing the leading edge position of shock trains. And this optimization method can be also applied to studying other variable cross-section curved isolators.
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影响因子：
1.9
作者：
Billig, FS;Kothari, AP
通讯作者：
Kothari, AP
影响因子：
3.5
作者：
C. Mcclinton;Vincent L. Rausch;L. T. Nguyen;Joel R. Sitz
通讯作者：
C. Mcclinton;Vincent L. Rausch;L. T. Nguyen;Joel R. Sitz
DOI：
10.2514/6.2006-4686
发表时间：
2006-07
期刊：
--
影响因子：
--
作者：
Chen Bing;Xu Xu-Xu;Cai Guobiao
通讯作者：
Chen Bing;Xu Xu-Xu;Cai Guobiao
影响因子：
2.5
作者：
Jonathan S. Geerts;K. Yu
通讯作者：
Jonathan S. Geerts;K. Yu
弯曲隔离器中具有复杂背景波的无节流流动
影响因子：
2.5
作者：
Huang, He-xia;Tan, Hui-jun;Sheng, Fa-jia
通讯作者：
Sheng, Fa-jia