Influence of rotor aerodynamic heating on infrared characteristics of the distribution of the helicopter

Ren Lifeng; Zhang Jingzhou; Shan Yong; Liu Xiyue

Based on CFD/IR numerical calculations, the temperature distribution of rotor skin and the effect on the infrared radiation characteristics of helicopter were studied systematically. The results show that: (1) The temperature distribution on the rotor blades shows an increasing tendency from the rotor shaft to wingtip, the maximum temperature is 316 K, 29 K higher than the ambient temperature; The maximum temperature of radiation shield is 317 K, 30 K higher than the ambient temperature; (2) At the same detection angle, rotor infrared radiation intensity fluctuates along of time, the change of infrared radiation intensity with time in 3-5 m and 8-14 m bands is consistent; (3) The proportion of 3-5 m and 8-14 m band infrared radiation intensity increment of aerodynamic heating rotor in the same band infrared radiation intensity of overall solid are 15%-16%、5%-6%; (4) 8-14 m band infrared radiation intensity of aerodynamic heating rotor is about thirty times as much as that of 3-5 m band, the proportion of aerodynamic heating rotor 8-14 m band infrared radiation intensity in the same band Based on CFD/IR numerical calculations, the temperature distribution of rotor skin and the effect on the infrared radiation characteristics of helicopter were studied systematically. The results show that: (1) The temperature distribution on the rotor blades shows an increasing tendency from the rotor shaft to wingtip, the maximum temperature is 316 K, 29 K higher than the ambient temperature; The maximum temperature of radiation shield is 317 K, 30 K higher than the ambient temperature; (2) At the same detection angle, rotor infrared radiation intensity fluctuates along of time, the change of infrared radiation intensity with time in 3-5 m and 8-14 m bands is consistent; (3) The proportion of 3-5 m and 8-14 m band infrared radiation intensity increment of aerodynamic heating rotor in the same band infrared radiation intensity of overall solid are 15%-16%、5%-6%; (4) 8-14 m band infrared radiation intensity of aerodynamic heating rotor is about thirty times as much as that of 3-5 m band, the proportion of aerodynamic heating rotor 8-14 m band infrared radiation intensity in the same band infrared radiation intensity of overall solid is about 30%-40%, but reduction of rotor surface emissivity is the effective method to reduce the 8-14 m band infrared radiation intensity and the proportion in the same band infrared radiation intensity of overall solid.

1. College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

Received Date: 2013-05-10

Rev Recd Date: 2013-06-25

Publish Date: 2014-01-25

Key words:

Abstract: Based on CFD/IR numerical calculations, the temperature distribution of rotor skin and the effect on the infrared radiation characteristics of helicopter were studied systematically. The results show that: (1) The temperature distribution on the rotor blades shows an increasing tendency from the rotor shaft to wingtip, the maximum temperature is 316 K, 29 K higher than the ambient temperature; The maximum temperature of radiation shield is 317 K, 30 K higher than the ambient temperature; (2) At the same detection angle, rotor infrared radiation intensity fluctuates along of time, the change of infrared radiation intensity with time in 3-5 m and 8-14 m bands is consistent; (3) The proportion of 3-5 m and 8-14 m band infrared radiation intensity increment of aerodynamic heating rotor in the same band infrared radiation intensity of overall solid are 15%-16%、5%-6%; (4) 8-14 m band infrared radiation intensity of aerodynamic heating rotor is about thirty times as much as that of 3-5 m band, the proportion of aerodynamic heating rotor 8-14 m band infrared radiation intensity in the same band Based on CFD/IR numerical calculations, the temperature distribution of rotor skin and the effect on the infrared radiation characteristics of helicopter were studied systematically. The results show that: (1) The temperature distribution on the rotor blades shows an increasing tendency from the rotor shaft to wingtip, the maximum temperature is 316 K, 29 K higher than the ambient temperature; The maximum temperature of radiation shield is 317 K, 30 K higher than the ambient temperature; (2) At the same detection angle, rotor infrared radiation intensity fluctuates along of time, the change of infrared radiation intensity with time in 3-5 m and 8-14 m bands is consistent; (3) The proportion of 3-5 m and 8-14 m band infrared radiation intensity increment of aerodynamic heating rotor in the same band infrared radiation intensity of overall solid are 15%-16%、5%-6%; (4) 8-14 m band infrared radiation intensity of aerodynamic heating rotor is about thirty times as much as that of 3-5 m band, the proportion of aerodynamic heating rotor 8-14 m band infrared radiation intensity in the same band infrared radiation intensity of overall solid is about 30%-40%, but reduction of rotor surface emissivity is the effective method to reduce the 8-14 m band infrared radiation intensity and the proportion in the same band infrared radiation intensity of overall solid.

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Influence of rotor aerodynamic heating on infrared characteristics of the distribution of the helicopter

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