Heat Transfer Visualization of Swirling Impinging Jets Using Nozzle with Centrally Hollow Helical-Tape

Eiamsa-ard, Smith; Kunnarak, K.; Wongcharee, K.; Chuwattanakul, V.

doi:10.18178/ijmerr.9.5.673-678

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…It clearly can be found from the image that the lowtemperature airflow in the external duct and the high-temperature airflow in the internal duct are mixed more evenly after passing the mixer, and the airflow in the throat is also mixed more evenly, and the temperature of the airflow is stable at about 750K. The internal structure of the nozzle has a strong disturbance to the airflow through the nozzle, when the wake flow is just jetting out, it has a strong mixing effect with the external airflow, the wake flow temperature gradient is large and the temperature changes quickly, and the wake flow temperature gradient also decreases gradually with the motion of the airflow [10] . The static temperature distribution of the wide symmetric surface is similar to that of the narrow symmetric surface.…”

Section: Calculation Results Of the Flow Fieldmentioning

confidence: 99%

Influence of emissivity on infrared radiation characteristics of the two-dimensional nozzle

Deng,

Yang,

Yang

et al. 2024

J. Phys.: Conf. Ser.

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In the case of the same outlet area, the two-dimensional (2-D) nozzle has a large aspect ratio compared to the axisymmetric circline nozzle, which enables it to reduce the visible area of high-temperature components such as the center cone and the flame stabilizer inside the nozzle. It can also strengthen the mixing effect of wake flow and outflow to achieve the effect of cooling. In this work, based on the calculation of the flow field of the 2-D convergent-divergent nozzle, the infrared radiation characteristics of its with different emissivity coatings and the coating under high-temperature coming off are calculated in the 3∼5um waveband. The results show that with the increase of emissivity, the mean value of infrared radiation intensity of the nozzle in the range of detection angle 0°-70° decreases to 68.80%, while the mean value of infrared radiation intensity in the range of detection angle 80°-90° rises to 136.55%. The nozzle coating coming off is caused by excessive temperature and its infrared radiation intensity even exceeds the infrared radiation intensity of the uncoated state when the coating comes off.

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Section: Calculation Results Of the Flow Fieldmentioning

confidence: 99%

Influence of emissivity on infrared radiation characteristics of the two-dimensional nozzle

Deng,

Yang,

Yang

et al. 2024

J. Phys.: Conf. Ser.

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show abstract

“…Numerical simulation studies on nozzles are in other fields as follows. In 2020, Smith [9] et al conducted research to determine the heat transfer visualization of swirling impinging jets induced by nozzle with centrally hollow helical tape. In 2021, Himawan [10] studied the development of a centrifugal pump nozzle for firefighting motorcycle by experiments and numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

Study on conjugate heat transfer characteristics of flexible structure of solid motor nozzle based on multiple working conditions

Wang

2023

J. Phys.: Conf. Ser.

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In order to study the influence of the deformations of the nozzle’s flexible sections on its inner wall’s heat transfer, this research uses the two-dimensional axisymmetric model and the k − ω SST turbulence model to numerically analyze the tail flow field of the flexible-extendible nozzle under multiple working conditions. The flow field and the inner wall’s heat transfer of the flexible sections with and without deformations are simulated and analyzed. The simulation results show that when the flexible sections are deformed, new shock waves will be generated in the tail flow field of the nozzle; the temperature and the heat flux of the first half of each flexible section decrease, while those at the end of each flexible section increase, and the deformations’ effect on temperature and heat flux diminishes over time. The research shows that the deformations of the flexible sections will make the inner wall’s heat transfer of the flexible sections uneven, and the inner wall’s ablation at the end of each flexible section may be aggravated, while that of the front half may be alleviated.

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Heat transfer rate of swirling impinging jets issuing from a twisted tetra-lobed nozzle

Wongcharee

Kunnarak

Chuwattanakul

et al. 2020

Case Studies in Thermal Engineering

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Heat Transfer Visualization of Swirling Impinging Jets Using Nozzle with Centrally Hollow Helical-Tape

Cited by 3 publications

References 11 publications

Influence of emissivity on infrared radiation characteristics of the two-dimensional nozzle

Influence of emissivity on infrared radiation characteristics of the two-dimensional nozzle

Study on conjugate heat transfer characteristics of flexible structure of solid motor nozzle based on multiple working conditions

Heat transfer rate of swirling impinging jets issuing from a twisted tetra-lobed nozzle

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