A new model to simulate infrared radiation from an aircraft exhaust system

Wang, Qiang; Li, Ting

doi:10.1016/j.cja.2017.02.014

Cited by 24 publications

(5 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be seen that due to the limitations of the instrument's field of view, the equipment needs to be placed at a distance to ensure that the wake is fully within the instrument's field of view. However, when the distance is too far, atmospheric attenuation is significant, the instrument's signal-to-noise ratio decreases, and data processing errors are prone to occur [11] . Therefore, the location of the measurement point should comprehensively consider factors such as the size of the target being measured, the angle of view of the equipment, and the testing direction.…”

Section: Measurement Methodsmentioning

confidence: 99%

Measurement of static infrared radiation intensity of aircraft backward on the ground

chen,

jiao,

zhou

et al. 2023

Third International Computing Imaging Conference (CITA 2023)

View full text Add to dashboard Cite

Aircraft engine is the main radiation source in the rear hemisphere of combat aircraft, and the main target for infrared guided weapon systems to detect, track, and attack. Therefore, studying the characteristics of aircraft’s backward infrared radiation is the significant basis for infrared stealth design and improvement of plane. In this paper, the principle and method of infrared thermal imaging testing are studied, and the ground static infrared radiation intensity test of a military aircraft is carried out. The relationship between the aircraft’s long-wave and medium-wave infrared Radiation Intensity with time is obtained at the azimuth of 45°, and relevant data is accumulated, which provides technical support for the subsequent aircraft infrared stealth performance assessment.

show abstract

Section: Measurement Methodsmentioning

confidence: 99%

Measurement of static infrared radiation intensity of aircraft backward on the ground

chen,

jiao,

zhou

et al. 2023

Third International Computing Imaging Conference (CITA 2023)

View full text Add to dashboard Cite

show abstract

“…In addition to the energy radiated as electromagnetic radiation, the flame heat source also produces a certain amount of gases at an increased temperature which, due to convection, move in the vertical direction. This direction is highly unfavourable because this energy is not utilised to protect fruit trees from low temperatures [21]. The solution to this problem is to use elements that convert the thermal energy of the mixture of heated air and exhaust gases into infrared radiation [19].…”

Section: Range Of Influence Of the Flame Heat Source With An Infrared...mentioning

confidence: 99%

Flame Heat Sources as a Sustainable Method of Protecting Fruit Orchards against Frost in Poland

Balawejder,

Matłok,

Piechowiak

et al. 2024

Sustainability

View full text Add to dashboard Cite

One of the key factors affecting the yield of fruit orchards is their protection against spring frosts. This paper presents the methods currently used (like anti-frost nets, chemical agents, etc.) and proposes an alternative method of raising the temperature around fruit trees using flame heat sources with a suitable heating power. Flame heat sources in the form of metal containers filled with paraffin were utilised in this experiment. The effect of the flame heat sources on the relative increase in the temperature of a wooden surface (simulating trees located in Rzeszow, Poland) depending on the distance from the heat source was measured and estimated based on mathematical models. Based on the results of experimental work, an optimal placement of flame heat sources (1.58 m from each tree) was proposed for orchards of semi-dwarf fruit trees. The proposed modifications of the flame heat sources to incorporate infrared radiation converters resulted in a greater increase in the temperature of the wooden surface. The analysis of the available economic and environmental data showed that the proposed method may be a competitive alternative to the standard method of protection. If the flame heat sources are filled with combustible materials derived from renewable sources, such as those produced from fats, the overall CO2 emission balance for this solution will be significantly more favourable. The use of flame heat sources does not necessitate the introduction of permanent changes in the environment, as is required in cases when irrigation infrastructure is installed.

show abstract

“…Recently, more and more studies have tended to use the anti-Monte Carlo method in radiation characteristics simulation for its high accuracy and efficiency; this method has gradually replaced the traditional ray-tracing method [28,29].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Flow and Infrared Radiation Characteristics of Nozzles with Transverse Jets of Different Shapes

et al. 2022

View full text Add to dashboard Cite

The hot jet of an aero engine is one of the main radiation sources of infrared detectors in 3–5 microwave bands. Transverse jets were introduced into a hot jet to enhance mixing and reduce the infrared radiation characteristics. This proved to be a high-efficiency and low-resistance infrared suppression technology. The steady-state distribution of temperature data was simulated, which was needed in the thermal radiation calculation. The radiation characteristics were calculated based on the anti-Monte Carlo method in 3–5 microwave bands. The mechanics of enhanced mixing by a rectangular nozzle or transverse jets was investigated with the LES simulation. Compared with an axisymmetric nozzle, a rectangular nozzle induced abundant counter-rotating vortex pairs (CVP), hairpins, shears, and helical vortexes, which resulted in significant mixing enhancement and infrared radiation decrease of the hot jets. Further, circumferential transverse jets of different types were introduced downstream of the nozzle. These jets enhanced the mixing and reduced the infrared radiation in the 3–5 µm band. The mixing characteristics of these different schemes were studied in detail. Large-scale vortices formed on the windward portion of the hot jet boundary under the effect of the transverse jets, which caused strong CVP structures. They also resulted in hairpin vortexes, shear vortexes, and helical vortexes appearing earlier and occurring more frequently than with nozzles without transverse jets. The enhanced mixing caused by the transverse jets led to an increase in temperature decay and a decrease in infrared radiation in the 3–5 µm band. Further, transvers jets of different geometrical shapes (rectangular, cube, and circular schemes) achieved different mixing characteristics, and the rectangular transverse jets allowed the most significant mixing for the largest Q criterion value.

show abstract

A new model to simulate infrared radiation from an aircraft exhaust system

Cited by 24 publications

References 27 publications

Measurement of static infrared radiation intensity of aircraft backward on the ground

Measurement of static infrared radiation intensity of aircraft backward on the ground

Flame Heat Sources as a Sustainable Method of Protecting Fruit Orchards against Frost in Poland

Numerical Investigation of the Flow and Infrared Radiation Characteristics of Nozzles with Transverse Jets of Different Shapes

Contact Info

Product

Resources

About