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| 利用DES方法进行细长旋成体纵向俯仰大迎角气动特性的计算研究 | |
| 引用本文： | 夏明.利用DES方法进行细长旋成体纵向俯仰大迎角气动特性的计算研究[J].科学技术与工程,2011,11(16):3720-3724. |
| 作者姓名： | 夏明 |
| 作者单位： | 1. 西北工业大学翼型叶栅空气动力学国防科技重点实验室,西安710072;英国克兰菲尔德大学宇航工程系,英国米尔顿市MK43 0AL 2. 西北工业大学翼型叶栅空气动力学国防科技重点实验室,西安710072;日本名古屋大学工学部航空系,日本名古屋市464-8603 3. 西北工业大学翼型叶栅空气动力学国防科技重点实验室,西安,710072 4. 英国克兰菲尔德大学宇航工程系,英国米尔顿市MK43 OAL |
| 基金项目： | 国家自然科学基金(10772149) |
| 摘 要： | 在亚临界流动范围内,利用DES方法对俯仰细长旋成体的流动特性进行数值模拟,给出了细长旋成体在大攻角纵向俯仰中的截面流态特点。研究发现,迎角变化跨越对称至不对称流态的上仰运动会产生明显的气动力迟滞现象,推迟了非对称的产生迎角,并延缓了细长体背风面流态之间的过渡。对细长体大攻角运动气动分析在国内外研究尚少,研究成果对充分利用非定常气动力有指导意义。 |
| 关 键 词： | 非定常空气动力学 细长旋成体 非对称 气动滞后 |
| 收稿时间： | 3/4/2011 8:34:10 AM |
| 修稿时间： | 3/4/2011 8:34:10 AM |
Numerical study of Unsteady Aerodynamic Characteristics of Pitching Slender Body |
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| xiaming.Numerical study of Unsteady Aerodynamic Characteristics of Pitching Slender Body[J].Science Technology and Engineering,2011,11(16):3720-3724. | |
| Authors: | xiaming |
| Institution: | XIA Ming1,2,LI Dong1,3,SONG Bi-feng1,ZHONG Bo-wen2,YE Rui1(National Key Laboratory of Aerodynamic Design and Research,NWPU1,Xi'an 710072,P.R.China,Department of Aerospace,Cranfield University2,United Kingdom,MK43 0AL,Department of Aerospace Engineering of Nagoya University3,464-8603 Nagoya,Japan) |
| Abstract: | Numerical investigations of flow behavior for pitching-up and pitching-down slender body are performed in subcritical Reynolds number region. Sectional slow pattern is observed and corresponding flow mechanism is analyzed. It is found that the obvious aerodynamic hysteresis will arise when the pitching oscillation of the model goes through the different flow condition (symmetric and asymmetric vortices). Pitching motion delays the occurring angle of asymmetry and slows the transition of flowfield structure. Consequently the results are useful to the application of unsteady aerodynamic forces. |
| Keywords: | unsteady aerodynamics slender body asymmetric vortices hysteresis characteristics |
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