Effect of baffle configuration on aerodynamic and infrared radiation characteristics of helicopter infrared suppressor

被引：0
|
作者：
Chen S. [1 ]
Shan Y. [1 ]
Zhang J. [1 ]
Yang Z. [1 ]
机构：
[1] Key Laboratory of Thermal Management and Energy Utilization of Aircraft, Ministry of Industry and Information Technology, College of Energy and Power, Nanjing University of Aeronautics and Astronautics, Nanjing
来源：
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | 2022年 / 51卷 / 08期
关键词：
double bow-shaped baffle; exhaust system; infrared stealth; two-dimensional mixing duct;
D O I：
10.3788/IRLA20210659
中图分类号：
学科分类号：
摘要：
In this paper, a baffle with an ejector structure is designed to block the high-temperature parts in the infrared suppressor. At the same time, the baffle structure injects ambient cold air to cool its own surface to significantly reduce the infrared radiation of the infrared suppressor. The effects of bow-shaped baffle configuration on the aerodynamic performance, temperature field, and spatial distribution of infrared radiation intensity of the infrared suppressor are studied by numerical simulation. The results show that compared with the nonbaffle structure (Case 0), the baffle structure increases the pumping coefficient of the two-dimensional ejector nozzle by 115% and the thermal mixing efficiency of the infrared suppressor by 273%. Nevertheless, the total pressure recovery coefficient of the infrared suppressor decreases by 7%, and the peak values of the wall and gas infrared radiation intensity are reduced by 46% and 72% within the 3-5 μm band, respectively. Compared with the single bow-shaped baffle (Case 1) structure, the better-designed double bow-shaped baffle (Case 3) can eject ambient cold air with a pumping coefficient of approximately 0.1 and reduce the average surface temperature of its cold side from 638 K to 415 K. The peak values of the wall and gas radiation intensity decrease by 84% and 80% within the 3-5 μm band. In general, the surface temperature of the bow-shaped baffle cold side is affected by the internal eject flow of the double bow-shaped baffle, the stagnation vortex downstream of the bow-shaped baffle cold side, and the cold backflow at the narrow edge end face of the two-dimensional mixing duct. © 2022 Chinese Society of Astronautics. All rights reserved.
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  • [1] Sonawane H R, Mahulikar S P., Tactical air warfare: Generic model for aircraft susceptibility to infrared guided missiles, Aerospace Science & Technology, 15, 4, pp. 249-260, (2011)
  • [2] Rao G A, Mahulikar S P., New criterion for aircraft susceptibility to infrared guided missiles, Aerospace Science & Technology, 9, 8, pp. 701-712, (2005)
  • [3] Song Xinbo, Lv Xueyan, Zhang Jianjun, Research on aircraft infrared stealth technology, Laser and Infrared, 42, 1, pp. 3-7, (2012)
  • [4] Sheng Zhiqiang, Huang Peilin, Ji Jinzu, Et al., Effects of modification on jet mixing of sword alternating lobed nozzle, Journal of Beijing University of Aeronautics and Astronautics, 40, 10, pp. 1417-1423, (2014)
  • [5] Rogalski A., Competitive technologies of third generation infrared photon detectors, Opto-Electronics Review, 14, 1, pp. 84-98, (2006)
  • [6] Chen Geng, Shan Yong, Tan Xiaoming, Et al., Effects of mixing duct geometric parameters on flow dynamics and infrared radiation characteristics for IR suppressor, Infrared and Laser Engineering, 44, 12, pp. 3597-3603, (2015)
  • [7] Mohammadaliha N, Afshin H, Farahanieh B., Numerical investigation of nozzle geometry effect on turbulent 3-D water offset jet flows, Journal of Applied Fluid Mechanics, 9, 4, pp. 2083-2095, (2016)
  • [8] Baranwal Nidhi, Mahulikar S P., Review of infrared signature suppression systems using optical blocking method, Defence Technology, 15, 3, pp. 194-201, (2019)
  • [9] Paterson J., Overview of low observable technology and its effects on combat aircraft survivability, Journal of Aircraft, 36, 2, pp. 380-388, (1999)
  • [10] Paterson J., Measuring low observable technology's effects on combat aircraft survivability [C], World Aviation Congress, (2013)
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