Influence of ejector technique on infrared radiation of the exhaust plume outside rectangular nozzle

2013 ◽  
Author(s):  
Yunsong Feng ◽  
Yuan Lu ◽  
Ya Qiao
Keyword(s):  
Infrared Radiation ◽  
Exhaust Plume ◽  
Rectangular Nozzle

Numerical evaluation of the exhaust-direction effects on plume flow and helicopter infrared radiation under hover and cruise statuses

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Zongyao Yang ◽  
Yong Shan ◽  
Jingzhou Zhang
Keyword(s):  
Radiation Intensity ◽  
Infrared Radiation ◽  
Design Methodology ◽  
Main Rotor ◽  
Content Type ◽  
Exhaust Plume ◽  
Ir Signature ◽  
Plume Flow ◽  
The Impact ◽  
Rotational Direction

Purpose This study aims to investigate the effects of exhaust direction on exhaust plume and helicopter infrared radiation in hover and cruise status. Design/methodology/approach Four exhaust modes are concerned, and the external flow field and fuselage temperature field are calculated by numerical simulation. The infrared radiation intensity distributions of the four models in hovering and cruising states are computed by the ray-tracing method. Findings Under the hover status, the exhaust plume is deflected to flow downward after it exhausts from the nozzle exit, upon the impact of the main-rotor downwash. Besides, the exhaust plume shows a “swirling” movement following the main-rotor rotational direction. The forward-flight flow helps prevent the hot exhaust plume from a collision with the helicopter fuselage generally for the cruise status. In general, the oblique-upward exhaust mode provides moderate infrared radiation intensities in all of the viewing directions, either under the hover or the cruise status. Compared with the hover status, the infrared radiation intensity distribution alters somewhat in cruise. Originality/value Illustrating the influences of exhaust direction on plume flow and helicopter infrared radiation and the differences of helicopter infrared radiation under hover and cruise statuses are identified. Finally, an appropriate exhaust mode is proposed to provide a better IR signature distribution.

Influence of Afterburning on Infrared Radiation of Liquid Rocket Exhaust Plume

2013 ◽  
Vol 42 (4) ◽  
pp. 480-485
Author(s):  
刘尊洋 LIU Zun-yang ◽  
邵立 SHAO Li ◽  
汪亚夫 WANG Ya-fu ◽  
孙晓泉 SUN Xiao-quan
Keyword(s):  
Infrared Radiation ◽  
Exhaust Plume ◽  
Liquid Rocket ◽  
Rocket Exhaust

Influence on Afterburning on Infrared Radiation of Solid Rocket Exhaust Plume

2013 ◽  
Vol 33 (6) ◽  
pp. 0604001
Author(s):  
刘尊洋 Liu Zunyang ◽  
邵立 Shao Li ◽  
汪亚夫 Wang Yafu ◽  
孙晓泉 Sun Xiaoquan
Keyword(s):  
Infrared Radiation ◽  
Exhaust Plume ◽  
Solid Rocket ◽  
Rocket Exhaust

scholarly journals Dynamic measurement and correction of infrared radiation temperature for rocket motor exhaust plume

FirePhysChem ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 21-26
Author(s):  
Jianhua Yi ◽  
Zhihua Sun ◽  
Changjian Wang ◽  
Yi Xu ◽  
Zhao Qin ◽  
...  
Keyword(s):  
Infrared Radiation ◽  
Dynamic Measurement ◽  
Rocket Motor ◽  
Radiation Temperature ◽  
Exhaust Plume ◽  
Motor Exhaust

scholarly journals Computation on Infrared Radiation of Side Exhaust Plume under Spraying Water

2021 ◽  
Vol 2112 (1) ◽  
pp. 012002
Author(s):  
Zhongke Sun ◽  
Zhongwei Chen ◽  
Xiao Ma
Keyword(s):  
High Temperature ◽  
Radiation Intensity ◽  
Infrared Radiation ◽  
Concentration Field ◽  
Exhaust System ◽  
Band Model ◽  
Exhaust Pipe ◽  
Liquid Droplets ◽  
Ansys Fluent ◽  
Exhaust Plume

Abstract The high temperature plume of ships has obvious infrared radiation feature. Spraying water-liquid droplets in side exhaust system can effectively reduce the high temperature of the tail gas to reduce the infrared radiation of the exhaust plume. In this paper, ANSYS Fluent is used to establish the concentration field and temperature field of the side exhaust plume atter spraying water-liquid droplets. And the statistic narrow band model (Malkmus model) and the C-G approximation method are used to calculate the infrared radiation intensity of the exhaust plume in the normal direction of the exhaust outlet from 3 to 5 μm on this basis. The final results show that spraying water-liquid droplets in side exhaust pipe can reduce the infrared radiation of the side exhaust plume from 3 to 5um by 88.9%% compared with the initial intensity; when the water flow reaches 0.7kg/s, infrared radiation intensity remains unchanged.

Influence of Flight Parameters on the Infrared Radiation of a Liquid Rocket Exhaust Plume

2013 ◽  
Vol 33 (4) ◽  
pp. 0404001 ◽  
Author(s):  
刘尊洋 Liu Zunyang ◽  
邵立 Shao Li ◽  
汪亚夫 Wang Yafu ◽  
孙晓泉 Sun Xiaoquan
Keyword(s):  
Infrared Radiation ◽  
Exhaust Plume ◽  
Flight Parameters ◽  
Liquid Rocket ◽  
Rocket Exhaust
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