| 引用本文: | 何霖,易仕和,赵玉新,等.BOS技术在流动测量中的应用.[J].国防科技大学学报,2010,32(1):1-5.[点击复制] |
| HE Lin,YI Shihe,ZHAO Yuxin,et al.The Application of BOS in Flow Measurement[J].Journal of National University of Defense Technology,2010,32(1):1-5[点击复制] |
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| BOS技术在流动测量中的应用 |
| 何霖, 易仕和, 赵玉新, 田立丰, 程忠宇 |
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(国防科技大学 航天与材料工程学院，湖南 长沙 410073)
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| 摘要: |
| 背景纹影技术是新近提出的一种流动显示技术。与纹影、干涉等传统流动显示方法相比，BOS技术不仅具有高时空分辨率，同时还可以对流场密度梯度场进行定量测量。根据BOS技术的原理，搭建了一套BOS系统，采用该系统测量了蜡烛火焰上方的热对流流场，得到了热对流流场的瞬态流动结构，验证了BOS系统的性能。在此基础上，采用BOS系统对超声速混合层进行了实验研究，得到了超声速混合层的精细空间结构和密度梯度场的定量分布，实验结果充分体现出BOS技术在流动测量中的巨大优势。 |
| 关键词: BOS 纹影 流动显示 密度梯度 定量测量 |
| DOI： |
| 投稿日期：2009-06-10 |
| 基金项目:国家自然科学基金资助项目(10672178，10772168) |
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| The Application of BOS in Flow Measurement |
| HE Lin, YI Shihe, ZHAO Yuxin, TIAN Lifeng, CHENG Zhongyu |
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(College of Aerospace and Materials Engineering, National Univ. of Defense Technology, Changsha 410073, China)
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| Abstract: |
| Background oriented schlieren (BOS) is a new technique for flow visualization. Compared with schlieren and interferometry, BOS can measure density gradient quantitatively with high spatiotemporal resolution. Based on its principle, a BOS system is set up in this paper. Using this system, the thermal convection flow field over a candle flame is measured, and its transient flow structure is visualized. The whole process verifies the performance of the BOS system. Then, a supersonic mixing layer is studied, its fine flow structures and quantitative density gradient distribution are acquired. The results show obvious advantages of BOS in flow measurement. |
| Keywords: BOS schlieren flow visualization density gradient quantitative measurement |
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