光子学报 ›› 2019, Vol. 48 ›› Issue (10): 1001003-1001003.doi: 10.3788/gzxb20194810.1001003

• 大气与海洋光学 • 上一篇    下一篇

喷流压比对高超声速流场调制传递函数的影响

赵鑫海, 易仕和, 丁浩林, 欧阳天赐, 石洋   

  1. 国防科技大学 空天科学学院, 长沙 410073
  • 收稿日期:2019-05-10 出版日期:2019-10-25 发布日期:2019-07-16
  • 通讯作者: 易仕和(1958-),男,教授,博士,主要研究方向为实验流体力学.Email:yishihe_gfkd@foxmail.com E-mail:yishihe_gfkd@foxmail.com
  • 作者简介:赵鑫海(1993-),男,博士研究生,主要研究方向为航天气动光学与成像制导.Email:1873129527@163.com
  • 基金资助:

    国家自然科学基金(Nos.11172326,11302256)

Influence of Pressure of Jet on Hypersonic Flow Field Modulation Transfer Function

ZHAO Xin-hai, YI Shi-he, DING Hao-lin, OU-YANG Tian-ci, SHI Yang   

  1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410073, China
  • Received:2019-05-10 Online:2019-10-25 Published:2019-07-16
  • Contact: 2019-07-16 E-mail:yishihe_gfkd@foxmail.com
  • Supported by:

    The National Natural Science Foundation of China(Nos. 11172326,11302256)

摘要:

设计搭建了基于高超声速(Ma=6.0)炮风洞的气动光学地面试验平台,试验对象为带冷却喷流装置的光学头罩模型.利用高速摄像机并结合背景纹影技术获取了喷流压比为0、04、1.0、1.16和1.8五种状态下的光线偏折信息,结合几何光学传递函数理论获取了对应状态下流场的调制传递函数.试验结果表明,喷流压比增大使得流向和展向的调制传递函数包络面积减小,较大喷流压比下流向调制传递函数在2~4 lp/mm区间出现波动现象.

关键词: 高超声速, 流场, 测量, 背景纹影, 调制传递函数

Abstract:

An aero-optical ground test platform based on the hypersonic (Ma=6.0) gun tunnel was built. The test object was an optical dome model with cooling jet structure. Combined with background oriented schlieren technology, a high-speed camera was used to obtain the light deflection information of the flow field with five different pressure of jet value:0, 04, 1.0, 1.16 and 1.8. And the corresponding modulation transfer function was calculated with the geometric optics theory. The experimental results show that the increase of pressure ratio of jet value can reduce the envelope area of the modulation transfer function of the flow direction and span direction. The flow direction modulation transfer function fluctuates between 2~4 lp/mm under larger pressure ratio of jet value.

Key words: Hypersonic, Modulation transfer function, Measurement, Flow field, Background oriented schlieren

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