Nuclear thermal propulsion (NTP) systems is regarded as a promising technology for human space exploration in the near future due to its large thrust and high specific impulse. Hydrogen serves as both the system coolant and engine propellant here. Convective heat transfer to hydrogen flow is a complicated process accompanying large properties variation of hydrogen due to high heat flux. In this paper, the strongly heated internal hydrogen flow is investigated numerically. According to the previous work, it has been found that the standard k-ε model with the assistance of enhanced wall treatment shows the excellent agreement with the experimental data. Based on this validated approach, the effects of heat flux profile on flow and heat transfer characteristics are evaluated. Results show high dependency of the thermal hydraulics characteristics such as wall temperature distribution and heat transfer coefficient on the heat flux profile imposed at the tube wall. Besides, the results suggest that the flow acceleration to a flat velocity profile contributes to the heat transfer deterioration, while the distorted velocity to “M-shape” is considered to be more often related to the recovery of turbulence production and subsequent heat transfer.
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2018 26th International Conference on Nuclear Engineering
July 22–26, 2018
London, England
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-5149-4
PROCEEDINGS PAPER
A Computational Study of Strongly Heated Internal Hydrogen Flow Under Non-Uniform Heat Flux
Yu Ji
Tsinghua University, Beijing, China
Jun Sun
Tsinghua University, Beijing, China
Lei Shi
Tsinghua University, Beijing, China
Paper No:
ICONE26-82356, V06BT08A052; 6 pages
Published Online:
October 24, 2018
Citation
Ji, Y, Sun, J, & Shi, L. "A Computational Study of Strongly Heated Internal Hydrogen Flow Under Non-Uniform Heat Flux." Proceedings of the 2018 26th International Conference on Nuclear Engineering. Volume 6B: Thermal-Hydraulics and Safety Analyses. London, England. July 22–26, 2018. V06BT08A052. ASME. https://doi.org/10.1115/ICONE26-82356
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