基于横流修正转捩模型的飞艇艇身减阻优化研究  

Drag Reduction Optimization of Airship Hull Based on Cross-Flow Modified Transition Model

作　　者：段欣葵 王圣业 符翔 王光学[1,2] 刘伟 Duan Xinkui;Wang Shengye;Fu Xiang;Wang Guangxue;Liu Wei(National University of Defense Technology,Changsha 410015,China;Sun Yat-sen University,School of Aeronautics and Astronautics,Shenzhen 518107,China)

机构地区：[1]国防科技大学空天科学学院,长沙410015 [2]中山大学航空航天学院,深圳518107

出　　处：《动力学与控制学报》2023年第11期54-61,共8页Journal of Dynamics and Control

基　　金：国家自然科学基金资助项目(92252101,11927803,12002379)。

摘　　要：艇身外形优化设计是平流层飞艇减阻的有效方法之一,艇身转捩尤其是横流转捩对于三维艇身的阻力特性有很大影响.采用SST k-ω湍流模型耦合添加了横流修正的γ-Reθ-CF转捩模型在高精度CFD软件平台上进行艇身绕流计算.首先针对标准6:1椭球体算例进行数值方法验证,结果表明γ-Reθ-CF转捩模型能够比原始模型更好地预测旋成体外形的转捩位置,对于阻力特性的描述较为准确,且能够反映不同迎角下横流效应对旋成体外形转捩的影响.在此基础上,开展了考虑横流效应的艇身外形优化研究,涉及的几何因素包括艇身长度,艇身长细比和艇身最大直径的位置.选取传统的Goodyear飞艇艇身为参考,优化后的艇身在0°迎角下的总阻力减少约40%.Hull shape optimization is one of the effective methods for drag reduction of stratospheric airship.Transition,especially cross-flow transition,has a great influence on the drag characteristics of three-dimensional hull.SST k-ωturbulence model coupled withγ-Reθ-CF transition model considering cross-flow effect was used to calculate the flow around the hull,the calculation was running on the high-precision CFD software platform.Firstly,the numerical method was verified by a classical example of 6:1 prolate spheroid,the results showed thatγ-Reθ-CF transition model can better predict the transition position than the original version,and it also has good accuracy in predicting the drag characteristics.Besides,γ-Reθ-CF transition model can reflect the influence of cross-flow effect at different angles of attack.On this basis,hull optimization design was carried out considering the cross-flow effect,involving geometric factors including hull length,slenderness ratio and maximum diameter position.Compared with Goodyear airship with traditional ellipsoid hull shape,the drag reduction of optimized hull shape at 0°attack reached around 40%.

关 键 词：横流效应 平流层飞艇 转捩 艇身外形优化 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程]