转捩对平流层飞艇外形优化的影响

张海军; 郭雪岩; 戴韧

转捩对平流层飞艇外形优化的影响

上海理工大学能源与动力工程学院, 上海 200093

基金项目: 国家自然科学基金(51176127);上海市教委重点学科(J50501)

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出版历程
- 收稿日期: 2012-07-03
- 刊出日期: 2013-07-28

Effect of transition on optimization of stratospheric airship hulls

School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

摘要

摘要: 采用梯度算法优化了平流层飞艇外形以减少气动阻力,目标函数飞艇总阻力系数通过求解Navier-Stokes方程获得.优化过程中采用了SSTκ-ω转捩湍流模型和Realizable κ-ε全湍流模型求解绕流流场,采用大涡模拟方法详细分析了获得的两种飞艇外形的气动性能和特点,并且比较了两种湍流模拟方法的流场求解对梯度法优化的目标函数以及飞艇形状特点的影响.结果表明:是否考虑转捩对优化的结果有明显的影响,考虑转捩优化方案的气动性能明显优于全湍流流动求解优化方案.采用转捩模型的优化由于层流区域的存在改变了飞艇尾部的形状,从而获得了尾部分离区较小的飞艇外形轮廓.
- 平流层飞艇 /
- 转捩 /
- 湍流 /
- 外形优化 /
- 梯度算法
Abstract: Shape optimization of a stractospheric airship was conducted with a gradient algorithm to reduce the aerodynamic drag. The total drag coefficient as the objective function was evaluated by solving the Navier-Stokes equations. The shear stress transport(SST)κ-ω turbulent model with transition criterion and the Realizable κ-ε full turbulent model were applied when solving the flow field in the optimization steps. The aerodynamic performance of the flow structure around these two optimized airships was thoroughly analyzed based on the flow field obtained through large-eddy simulation. The influences of the transition model and the full turbulent model on the optimized objective function and the hull shape itself were compared. It is found that aerodynamic performance of the optimized hull taking laminar-turbulent transition into account is obviously better than the other. The existence of the laminar region enables to change the shape of rear part of the hull and determine a better shape with smaller separation zone.
- stratospheric airship /
- transition /
- turbulent /
- optimization /
- gradient algorithm

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参考文献(25)

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