Analysis of the impact of windward and angle of attack to the flow field around the optical window on high Mach condition
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摘要: 为了提高高马赫飞行下光学窗口的光学性能,对比分析了基于气动光学效应三种飞行器模型不同攻角的马赫数场、密度场、温度场和压力场的流场结构及对光学性能的影响.首先, 根据飞行器与来流的迎风面,建立了三种飞行器典型模型;继而, 给出了0、5和10攻角飞行工况;然后,建立了基于Navier-Stokes方程和湍流模型的三种攻角流场分布;最后, 对比分析了宽平头体飞行器中三种攻角温度场作用下的光学系统传递函数.结果表明,马赫数场与密度场、温度场与压力场分别具有相似分布形式;相同飞行速度和攻角下,大迎风面的飞行器光学窗口周围温度与压力较小迎风面大;相同飞行器,较大攻角对应较大流场强度,攻角为0、5和10时传递函数分别为0.188,0.097和0.028.此分析结果可为高马赫飞行下光学窗口优化提供一定的理论依据.Abstract: To improve the optical performance of optical window on the condition of high Mach flying, the structures of flight number field, density field, temperature field and pressure field corresponding to three kinds of aircraft on the angle of attack conditions on 0, 5 and 10 were provided and compared in this paper, as well as the influence to the optical properties of optical system. Firstly, three typical kinds of aircraft models were established based on the windward area of the aircraft head; secondly, the flight conditions on the angle of attack of 0 , 5 and 10 as well as the flight initial environment were provided; then, according to the Navier-Stokes equation and the turbulent model, the flow field distributions corresponding to the three kinds of aircraft model on the conditions of 0, 5 and 10 were obtained and analyzed; finally, taking the optical system on the operating condition of the flat -head aircraft as an example, the Modulation Transfer Function(MTF) on the operating conditions of the three kinds of attack angle were compared and analyzed. By the analyzed results, the Mach field and the destiny field, the temperature field and press field have the same distribution respectively; in the same flight velocity and angle of attack, the optical window of the aircraft owning large windward side has larger temperature and press than the optical window of small windward side aircraft; being the same aircraft, the operating condition of larger angle of attack corresponds to large flow field around the optical window. When the angles of attack are 0, 5 and 10, the values of MTF are 0.188, 0.097 and 0.028, respectively. The work of this study may provide a theoretical basis for the optimization of optical window on the operating condition of high Mach.
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Key words:
- flow field analysis /
- high Mach /
- optical window /
- aero-optical
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[1] Li Bo. Investigation on the aero-optical characteristics of flow field around high speed vehicle and optical window design[D]. Shanghai: Shanghai Jiaotong University, 2010. (in Chinese) [2] [3] Ding Yalin, Zhong Chongliang, Fu Jinbao. Mathematical model of optical window under high-mach flight condition[J]. Infrared and Laser Engineering, 2013, 42(3): 747-751. (in Chinese) [4] [5] [6] Meng Lixin, Zhao Dingxuan, Zhang Lizhong. Boundary layer effect and compensation in airborne laser communication[J]. Optics and Precision Engineering, 2014, 22(12): 3232-3238. (in Chinese) [7] [8] Li Yanwei, Zhang Hongwen, Zhan Lei, et al. Influence of high altitude environment on optical window in aerial remote sensor[J]. Infrared and Laser Engineering, 2012, 42(9): 1035-1039. (in Chinese) [9] [10] Hu Yuan,Fu Yuegang,Jiang Huilin. The aero optics effect on near space laser communication optical system[J]. Journal of Changchun University of Science and Technology (Natural Science Edition), 2013, 36 (1-2):1-9. [11] [12] Zhang Hongwen, Cao Guohua, Li Yanwei, et al. Thermal-optical evaluation to optical window of near space aerial remote sensor surrounding hypersonic[J]. Infrared and Laser Engineering, 2014, 43(12): 3958-3962. (in Chinese) [13] Guan Fengwei, Liu Ju, Yu Shanmeng. Space heat flux simulation and programmable load for thermal test of space optical remote sensor[J]. Chinese Optics, 2014, 7(6): 982-988. (in Chinese) [14] [15] Yang Huabin, Chen Lihuan, Li Yi. Thermal design and verification of transmission filter for wide angle aurora imager[J]. Optics and Precision Engineering, 2014, 22(11): 3019-3027. (in Chinese) [16] [17] [18] Xu Minglin, Xie Peng. Design for optical window in space environment simulation system[J]. Infrared and Laser Engineering, 2014, 43(S): 30-35. (in Chinese) [19] [20] Liu Xutang, Gao Yunguo, Shao Shuai. Design and test launch window for large-caliber multi-band high power laser system[J]. Optics and Precision Engineering, 2014, 22(7): 1834-1841. (in Chinese) [21] Li Yanwei, Zhang Hongwen, Yuan Guoqin. Design of protector for altitude sub=assembled optical window[J]. Optics and Precision Engineering, 2014, 22(3): 664-669. (in Chinese) -
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