Construction of narrow-band infrared radiation characteristics database for high-temperature hydrocarbon combustion media

2021 ◽  
Author(s):  
Jinlu Li ◽  
Lu Bai ◽  
Jingyu Bai ◽  
Yueyuan Xu ◽  
Tianjiao Zhang ◽  
...  
Keyword(s):  
High Temperature ◽  
Infrared Radiation ◽  
Narrow Band ◽  
Radiation Characteristics ◽  
Hydrocarbon Combustion

Infrared Radiation Characteristics of High-Temperature H2O and CO2 Gas Mixture Jet Flows

2017 ◽  
Vol 37 (7) ◽  
pp. 0726001
Author(s):  
郑海晶 Zheng Haijing ◽  
白廷柱 Bai Tingzhu ◽  
王全喜 Wang Quanxi ◽  
曹峰梅 Cao Fengmei
Keyword(s):  
High Temperature ◽  
Infrared Radiation ◽  
Jet Flows ◽  
Gas Mixture ◽  
Radiation Characteristics ◽  
Co2 Gas

Study on the Influence of Film Cooling on the Flow Field and Infrared Radiation Characteristics in the Divergent Section of a Nozzle

2020 ◽  
Author(s):  
Haoqi Yang ◽  
Qingzhen Yang ◽  
Saile Zhang ◽  
Huicheng Yang ◽  
Yubo He
Keyword(s):  
High Temperature ◽  
Flow Field ◽  
Infrared Radiation ◽  
Film Cooling ◽  
Exhaust System ◽  
Line Pattern ◽  
Radiation Characteristics ◽  
Core Zone ◽  
The Core ◽  
Significant Difference

Abstract As the last part of the convergent divergent nozzle, the divergent section is exposed to high temperature and high-speed airflow and thus, it is more easily to be detected by the infrared detector. It is one of the main sources of the infrared radiation in the exhaust system. Film cooling is applied to protect the wall from hot flow and reduce the infrared radiation. In this paper, the study is conducted on a nozzle with spherical convergence flap in a turbofan engine exhaust system. The effect of film cooling on the internal flow and infrared radiation characteristics of the exhaust system in the divergent section was studied by numerical simulations. The k-ω SST turbulence model was used to simulate the flow field, and the Reverse Monte Carlo Method was employed to calculate the infrared radiation characteristics of the nozzle. Four different kinds of film hole arrangements are involved, they are cylindrical film holes in an in-line pattern, cylindrical film holes in a staggered pattern, converging-expanding film holes in an in-line pattern and converging-expanding film holes in a staggered pattern. The cylindrical film hole and the converging-expanding film hole have a round shape inlet, with an equivalent diameter of d = 5mm on the projection surface perpendicular to the axial direction. Angles between each film hole and the wall surface are 35°. The impact of the heat conduction on the wall was taken into account. The results show that with the given mass flow rate of the coolant, the lengths of the high temperature core zone of the four models with different film cooling structures are slightly shorter than the core zone of the model without cooling structures. However, no significant difference can be found for the length of the core zone of the four models. The average temperature of the wall in the divergent section decreases significantly by using film cooling. No significant difference can be found in the wall temperature distribution for the four models. In the 3∼5μm and 8∼14μm bands, the cooling technique barely affects the infrared radiation of the main exhaust jet flow, while it significantly reduces the infrared radiation of the solid wall in the divergent section, and the decreasing amplitude is from 45% to 51%. Different film hole arrangements result in similar effects on the infrared radiation of the nozzle. Overall, the usage of film cooling in the divergent section of the nozzle effectively reduces the averaged wall temperature and substantially suppresses the solid infrared radiation on the wall. However, the shape and arrangement of the film holes have no significant influence on the infrared radiation intensity and temperature of the wall in the divergent section.

Research on infrared radiation characteristics of Pyromark1200 high-temperature coating

2014 ◽  
Author(s):  
Xuyao Song ◽  
Kewei Huan ◽  
Wei Dong ◽  
Jinghui Wang ◽  
Yanzhe Zang ◽  
...  
Keyword(s):  
High Temperature ◽  
Infrared Radiation ◽  
Radiation Characteristics

scholarly journals Failure mechanics and infrared radiation characteristics of soft coal at various moisture contents

2021 ◽  
Vol 12 (1) ◽  
pp. 1370-1384
Author(s):  
Yiju Tang ◽  
Jing Liu ◽  
Tianxuan Hao ◽  
Fan Li ◽  
Lizhen Zhao
Keyword(s):  
Infrared Radiation ◽  
Radiation Characteristics ◽  
Failure Mechanics ◽  
Moisture Contents ◽  
Soft Coal

An experimental study of infrared radiation characteristics of sandstone in dilatancy process

2020 ◽  
Vol 136 ◽  
pp. 104503
Author(s):  
Kewang Cao ◽  
Liqiang Ma ◽  
Dongsheng Zhang ◽  
Xingping Lai ◽  
Zhitao Zhang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Infrared Radiation ◽  
Radiation Characteristics

scholarly journals LASER SYSTEM FOR STUDYING THE DYNAMICS OF HIGH TEMPERATURE COMBUSTION

2019 ◽  
Vol 4 (2) ◽  
pp. 154-162
Author(s):  
Lin Li ◽  
Fedor Gubarev ◽  
Andrei Mostovshchikov ◽  
Alexander Ilyin
Keyword(s):  
High Temperature ◽  
Narrow Band ◽  
Laser System ◽  
Combustion Process ◽  
Visual Observation ◽  
Copper Bromide ◽  
Temperature Combustion ◽  
Temporal And Spatial ◽  
Combustion Processes ◽  
High Temperature Combustion

The paper is devoted to development of methods for studying the dynamics of high-temperature combustion of aluminum nanopowder.The difficulty in studying the combustion of nanopowders is the high temperature and intensity of light emissionduring the combustion process, which makes the visual observation virtually impossible.The paper discusses various schemes using laser radiation to study the combustion processes of metal nanopowders.Particular mentions the use of the laser monitor based on an active medium on copper bromide vapor to study the combustion process of various powders and mixtures.The laser monitor combines the functions of the narrow-band laser illuminator and the brightness amplifier, thereby achieving the visualization at a narrow gain wavelength. Therefore, the laser monitor can be used to observe the changes in the surface of a burning sample with high temporal and spatial resolution.

Sign in / Sign up

Export Citation Format

Share Document