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论文:2012,Vol:30,Issue(5):784-788 |
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引用本文: |
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郭东, 徐敏, 陈士橹. 基于网格速度法的非定常流场模拟和动导数计算[J]. 西北工业大学 |
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Guo Dong, Xu Min, Chen Shilu. An Effective Computation Method Based on Field Velocity Approach for Unsteady Flow Simulation and Obtaining Dynamic Derivatives[J]. Northwestern polytechnical university |
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基于网格速度法的非定常流场模拟和动导数计算 |
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郭东, 徐敏, 陈士橹 |
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西北工业大学 航天学院, 陕西 西安 710072 |
摘要: |
基于网格速度法的思想,将迎角的突变和俯仰角速率的突变叠加起来,发展了一套在固定网格上模拟飞行器俯仰振荡非定常流场的方法,该方法不需要实时更新网格,减少了计算时间和所需内存,避免了负体积的出现。首先计算了NACA 0006的阵风响应和NACA 0012翼型的俯仰振荡,所得结果与实验值和动网格方法符合较好,这表明该方法能够准确模拟此类非定常问题;最后将该方法应用于国外动导数计算标模Basic Finner Missile(BFM)俯仰振荡运动的数值模拟,并计算了其在马赫数1.58~2.5的静、动稳定性导数,计算结果与风洞实验值基本吻合,体现了该方法的正确性。 |
关键词:
计算流体力学
非定常流场
网格速度法
动导数
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An Effective Computation Method Based on Field Velocity Approach for Unsteady Flow Simulation and Obtaining Dynamic Derivatives |
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Guo Dong, Xu Min, Chen Shilu |
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College of Astronautics,Northwestern Polytechical University,Xi'an 710072,China |
Abstract: |
Sections 1 through 3 of the full paper explain and evaluate the computation method mentioned in the ti-tle, which we believe is effective.Their core consists of: the field velocity or grid velocity approach provides a u-nique methodology for directly calculating aerodynamic responses to step change in flow conditions; the grid timemetrics include the velocity caused by the impulsive change in angle of attack but the mesh is not moved according-ly; this approach avoids numerical instabilities and decouples the step change in the angle of attack from a pitchrate; based on this approach, a technique is presented to model longitudinal unsteady flow phenomenon by superpo-sing the step change in the angle of attack upon the impulsive change in pitch rate.In Figs.4 and 5, numerical re-sults are validated by comparison with experimental results for NACA 0012 airfoil under forced oscillations.To vali-date further the applicability for the present method, pitch damping derivatives, calculated from the load history ofthe unsteady flow around a standard research configuration, known as the Basic Finner Missile, are presented inFigs.10 and 11.Predicted results show indeed good agreement with available wind tunnel data. |
Key words:
computational fluid dynamics
computer simulation
numerical methods
stability
unsteady flow;field velocity
dynamic derivatives
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收稿日期: 2011-11-12
修回日期:
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DOI: |
基金项目: 国家自然科学基金重大研究计划(90816008);教育部博士点基金(20070699054)资助 |
通讯作者:
Email: |
作者简介: 郭东(1986-),西北工业大学博士研究生,主要从事弹性飞行器飞行动力学与气动弹性力学研究。
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郭东 在本刊中的所有文章 |
徐敏 在本刊中的所有文章 |
陈士橹 在本刊中的所有文章 |
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参考文献: |
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